2nd PUC Electronics Previous Year Question Paper March 2019

Students can Download 2nd PUC Electronics Previous Year Question Paper March 2019, Karnataka 2nd PUC Electronics Question Bank with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.

Karnataka 2nd PUC Electronics Previous Year Question Paper March 2019

2nd PUC Electronics Previous Year Question Paper March 2019

Time : 3 hrs. 15 min.
Max Marks: 70

Instructions:

  • The question has five Parts A, B, C and D.
  • Part – A has no choice
  • Part – D has two parts. Part -1 is from problems, Part – II is of essay type questions.
  • Circuit diagram/timing diagram/truth tables are drawn wherever necessary.
  • Problems without necessary formula/formulae carry no marks.

Part – A

Answer all questions: 10 x 1 = 10

Question 1.
Name the charge carriers in N-channel JFET.
Answer:
Electrons.

Question 2.
Write the value of bandwidth of an ideal OPAMP.
Answer:
Infinity.

Question 3.
Draw the waveform of damped oscillations.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 1

Question 4.
What is the function of transmitter in a radio communication system?
Answer:
Transmitter processes the information and transmits it.

2nd PUC Electronics Previous Year Question Paper March 2019

Question 5.
Draw the waveform of AM wave when modulation index ma=1
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 2

Question 6.
Define fidelity in a radio receiver.
Answer:
Fidelity is the ability of the receiver to reproduce the input faithfully.

Question 7.
Mention one application of TWAC.
Answer:
TRIAC can be used in fan motor control.

Question 8.
Write the decimal equivalent of BCD code (00110101)2.
Answer:
(00110101)2 = 3510.

Question 9.
Name anyone arithmetic operator in C-language.
Answer:
Addition or Subtraction.

2nd PUC Electronics Previous Year Question Paper March 2019

Question 10.
Expand RADAR. or = r v                                                                       ‘
Answer:
RADAR – Radio Detection And Ranging.

Part – B

Answer any Five question.

Question 11.
Mention the steps to obtain DC-equivalent circuit of a CE amplifier.
Answer:

  • Reduce all ac sources to ground.
  • Open all the capacitors.

Question 12.
Calculate the gain of a negative feedback amplifier with an internal gain, A = 100 and feedback factor β= 1/10.
Answer:
A= 100, β = 1/10.
2nd PUC Electronics Previous Year Question Paper March 2019 3

Question 13.
Write any two applications of crystal oscillator.
Answer:

  • Digital watches.
  • Clock, Calculators.
  • Transmitters and Receiver.

Question 14.
Realise XOR gate using basic logic gates.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 4

Question 15.
Write the difference between combinational and sequential logic circuits.
Answer:

Combinational Logic Circuit Sequential Logic Circuit
(i)  It does not have memory
(ii)  Its output depends only on present input.
(i) It has memory.
(ii) Its output depends on present and past input

2nd PUC Electronics Previous Year Question Paper March 2019

Question 16.
Write any two instruction set of 8051 microcontroller.
Answer:
These instructions move the content of one register to another one. Data can also be transferred to stack with the help of PUSH and POP instructions.
2nd PUC Electronics Previous Year Question Paper March 2019 5

Question 17.
Mention any two features of C-language.
Answer:
C is a powerful, flexible language that has gained worldwide acceptance in recent years. C is concise, yet powerful in its scope. It is a high-level language that also incorporates features of low-level languages. It is becoming the standard for program development on small machines and microcomputers.

It is possible to apply C to nearly all application areas. Modularity {process of dividing problems into sub-problems) makes C ideal for projects involving several programmers. C permits nearly every programming technique. C is widely available for most brands and type of computers. It is portable. With all the features C is not a difficult language, it is one of the easiest languages to learn and implement.

C programming can be used to write any complex program because of its rich set of built-in functions and operations. C compiler combines the capabilities of an assembly language with the feature of high-level language and therefore it is very much suited for uniting both system software and business packages. Because of its variety of data types, powerful operator programs in C are efficient and fast. C has the ability to extend, it means user-defined functions can also be added to C library.

2nd PUC Electronics Previous Year Question Paper March 2019

Question 18.
Briefly explain the internet.
Answer:

  1. Using internet, access to required information is easy, economical, reliable and fast.
  2. With E-mail, messages reach destination with in minutes.
  3. E-mail can be sent and received from any place.
  4. Using E-mail, message can be sent to several persons simultaneously.

Part – C

Answer any five questions.   5 x 3 = 15

Question 19.
Compare the FET and BJT.
Answer:

FET BJT.
1. It is unipolar device. 1. It is a bipolar device.
2. It is a voltage controlled device. 2. It is a current controlled devices.
3. Its input resistance is very high. 3. Input resistance is very low.
4. Current conduction is only by majority charge carriers either hole or electron. 4. Current conduction is both by electrons and holes.
5. It has high switching speed. 5. It has low switching speed.
6. Less noisy 6. More noisy.
7. Fabrication is easier in IC. 7. Difficult to fabricate in IC.

Question 20.
What is transistor biasing? Briefly explain the need for biasing a transistor
Answer:
The application of suitable DC voltage across the transistor terminals is called biasing of the transistor.

The reasons for biasing of a transistor are:

  1. To make the operating point to be at the centre of the load line.
  2. To make the collector current independent of temperature variations.
  3. To maintain the operating point constant even though transistor is replaced by another of same type.

2nd PUC Electronics Previous Year Question Paper March 2019

Question 21.
With a block diagram derive an expression for output impedance of aN amplifer with negative feedback.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 6
An amplifier should have a low output impedance so that it can deliver power to load without much loss. With negative feedback, the output impedance of the amplifier decreases which is desirable.

Let Zo be output impedance of basic amplifier and Zof be the output impedance with negative feedback. A hypothetical source of voltage Vo is applied at the output. By applying KVL to the output loop,

Vo = IoZo +AVi.
With negative feedback, input to basic amplifier with negative feedback is
Vi = Vs – Vf
V= o – Vf
V– Vf
{As input is short circuited, V = o}
2nd PUC Electronics Previous Year Question Paper March 2019 7
As 1+Aβ>1, output impedance of amplifier decreases by a factor(1+Aβ)

Question 22.
Explain the importance of ionosphere in the radio communication.
Answer:
Ultraviolet radiation from the sun cause the upper atmosphere to ionize i.e. to become electrically charged. Hence a thick layer of ions formed at heights of 50 km to 400km. The ionosphere supports MF and HF wave propagation.
Its three layers are:

D layer: It is at a height of 70 km and has an average thickness of 10 km. It disappears in the night time. It reflects VLF and LF waves and absorbs MF and HF waves.

E layer: It is at a height of 100 km with a thickness of 25 km. This layer disappears at night. It helps in MF and HF wave propagation.

F layer: It is at a height of 150 km and extends upto 400 km. This layer exists during both day and night time. During day time, it splits into two layers F, and F2, and combines to form a single F layer during night time.

F2 region. 250-400 km.
F1 region. 160-250 km.
E region. 95-130 km
D region. 50-95 km.
Troposphere Earth.

2nd PUC Electronics Previous Year Question Paper March 2019

Question 23.
Derive an expression for the total power of AM wave.
Answer:
The total power in AM wave is equal to the sum of powers of the carrier, the upper sideband and the lower sideband.
2nd PUC Electronics Previous Year Question Paper March 2019 8
2nd PUC Electronics Previous Year Question Paper March 2019 9

Question 24.
In a SCR full wave rectifier the firing angle is 90°, rms voltage of an input to the rectifier is 230 V and the load resistance is 25Ω. Calculate Vdc and Idc
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 10

2nd PUC Electronics Previous Year Question Paper March 2019

Question 25.
With a neat circuit diagram explain the working of power diode under forward bias condition.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 11

Question 26.
With a neat block diagram explain the satellite Transponder.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 12

Part – D

Answer any Three question  3 x 5 = 15

Question 27.
Calculate voltage gain (Ay) and input impedence (Zin) of a given CE amplifer with values
\(r_{ e }=\frac { 26{ mV } }{ { I }_{ { E } } } ,{ V }_{ { BE } }=0.7V\) β = 100.
2nd PUC Electronics Previous Year Question Paper March 2019 13
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 14

Question 28.
Calculate the output voltage (V0) for a given circuit below
2nd PUC Electronics Previous Year Question Paper March 2019 15
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 16

2nd PUC Electronics Previous Year Question Paper March 2019

Question 29.
A transistor Colpitts oscillator has L = 4 mH, C1 = 10 nF and C2 = 10 nF. Calculate the frequency of oscillations.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 17

Question 30.
The current of a AM transmitter is 8A when the carrier is sent, it increases to 8.65 A when the carrier is modulated. Find the percentage of modulation. Also calculate the antenna current when the depth of modulation is 0.75.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 18

Question 31.
Simplify the Boolean expression using K-map. Y(ABCD) = Σm(0, 2, 4, 5, 8, 10, 12, 14) + Σd(6, 13)  Write the logic circuit for the simplified expression.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 19

Part – E

Answer any Four questions.

Question 32.
Compare CE, CB and CC amplifiers.
Answer:

Parameter Types of Amplifiers.
CE CB CC
Current gain High (P) Less than 1 Highest (1+ p)
Voltage gain High Moderate Low
Power gain Highest Moderate Moderate
Phase shift 180° 0-
Input impedance Moderate Low High
Output impedance Moderate High Low
Bandwidth Narrow Wide Wide
Applications Used as AF amplifies Used as RF amplifies impedance
matching

2nd PUC Electronics Previous Year Question Paper March 2019

Question 33.
(a) What are active filters? (1 + 4)
Answer:
An active filter is a type of analog circuit implementing an electronic filter using active components, typically an amplifier. Amplifiers included in a filter design can be used to improve the cost, performance and predictability of a filter.

(b) With a neat circuit diagram explain the working of first order low pass active filter and draw its frequency response curve.
Answer:
Filter are circuits used to select a band of frequencies. The two types of filters are

  • low pass filter and
  • high pass filter.

2nd PUC Electronics Previous Year Question Paper March 2019 20

Cut off frequency \(\mathrm{f}_{C}=\frac{1}{2 \Pi \mathrm{R}_{1} \mathrm{C}_{1}}\)
Frequency response of low pass filter.

Question 34.
Draw a block diagram and explain the different stages of FM transmitter.
2nd PUC Electronics Previous Year Question Paper March 2019 21
Answer:
The modulating signal is applied to the pre-emphasis circuit, which improves signal to noise ratio, AF amplifier amplifies output of pre-emphasis. The processed signal is fed to reactance modulator. The reactance modulator uses a transistor or FET connected across tank circuit of carrier oscillator.

The oscillator frequency depends on the tank reactance which in turn depends on the instantaneous amplitude of modulating signal. Thus, output of reactance modulator will be a frequency modulated wave.

The oscillator is followed by a buffer amplifier which isolates oscillator from subsequent stages. The limiter maintains the amplitude constant. Class C power amplifier amplifies modulated wave to required power levels. The FM signal is then fed to the transmitting antenna.

Question 35.
(a)What is flip-flop?
Answer:
A flip flop is an electronic circuit with two stable states that can be used to store binary data. Flip-flops and latches are fundamental building blocks of digital electronics systems used in computers, communications, and many other types of systems. Flip-flops and latches are used as data storage elements

(b) With a logic diagram and truth table, explain the working of SR flip-flop, (1+4)
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 22

2nd PUC Electronics Previous Year Question Paper March 2019

Question 36.
Write a flow chart and explain the steps used in creating assembly language program in 8051 microcontroller
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 23

Question 37.
Write a C-program to find largest among three numbers.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2019 24
Output:
Enter the three numbers 15
24
48
48 is largest number among 15,24 and 48

2nd PUC Electronics Previous Year Question Paper March 2017

Students can Download 2nd PUC Electronics Previous Year Question Paper March 2017, Karnataka 2nd PUC Electronics Question Bank with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.

Karnataka 2nd PUC Electronics Previous Year Question Paper March 2017

2nd PUC Electronics Previous Year Question Paper March 2017

Time : 3 hrs. 15 min.
Max Marks: 70

Instructions:

  • The question has five Parts A, B, C and D.
  • Part – A has no choice
  • Part – D has two parts. Part -1 is from problems, Part – II is of essay type questions.
  • Circuit diagram/timing diagram/truth tables are drawn wherever necessary.
  • Problems without necessary formula/formulae carry no marks.

Part – A

Answer all questions: 10 x 1 = 10

Question 1.
Write the function of source in JFET.
Answer:
Source supplies charge carriers for current conduction.

Question 2.
Name the power amplifier in which conduction angle is 360°.
Answer:
Class A.

Question 3.
Define slew rate.
Answer:
Slew rate is the rate of change of output.

Question 4.
What is the frequency of modulating signal if the bandwidth of AM wave is 10 KHz?
Answer:
\(f_{\mathrm{m}}=\frac{\mathrm{BW}}{2}=\frac{10 \mathrm{KHz}}{2}=5 \mathrm{KHz}\)

2nd PUC Electronics Previous Year Question Paper March 2017

Question 5.
Define demodulation.
Answer:
Demodulation is the process of recovering original modulating signal from the modulated wave.

Question 6.
Draw the circuit symbol of IGBT.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 1

Question 7.
What is a counter?
Answer:
Counter is a logic circuit for counting the pulses.

Question 8.
Convert (1101)2 into gray code.
Answer:
(1011)G

Question 9.
How many interrupt sources are there in 8051 microcontroller?
Answer:
6 including RESET or 5 excluding RESET.

Question 10.
Write C equivalent expression for the mathematical expression \(\sqrt{a^{2}+b^{2}}\)
Answer:
sqrt (a*a+ b*b)

Part – B

Answer any five questions.

Question 11.
Write any two differences between FET and BJT.
Answer:

S.No. BJT JFET
1. It is a bipolar device. It is a unipolar device.
2. It is a current controlled device. It is a voltage controlled device.
3. Current conduction is by both holes and electrons. Current conduction is by holes or electrons.
4. Input resistance is low. Input resistance is very high. (MCI)
5. BJT is more noisy. JFET is less noisy.
6. Switching speed is less. Switching speed is high.
7. Fabrication in IC is difficult. Fabrication in IC is simpler.

2nd PUC Electronics Previous Year Question Paper March 2017

Question 12.
Mention the steps involved to obtain DC equivalent circuit of an amplifier.
Answer:

  • Reduce all the AC source to zero.
  • open all the capacitors.

Question 13.
Distinguish between positive feedback and negative feedback.
Answer:

  • Positive feedback is the process of applying a portion of output in phase with the input.
  • Negative feedback is the process of applying a portion of output out of phase with the input.

Question 14.
Write any two advantages of RC oscillators over LC oscillators.
Answer:

  • RC oscillators provide constant output and good stability.
  • RC oscillators do not require any inductor and hence size and cost get reduced.

Question 15.
Write Shockley’s diode equation for current through the power diode and explain its terminology.
Answer:
\(I=I_{ s }\left( e^{ \frac { qv }{ KT } }-1 \right)\)

  • Is = Reverse saturation current
  • T = Absolute temperature
  • K = Boltzmann constant
  • q = charge of electron
  • V = voltage across diode.

Question 16.
Determine average value of DC from chopper. Given T= 2 ms, TQN= 0.5 ms and supply voltage is 24V.
Answer:
Duty ratio = \( \frac{T_{o N}}{T}=\frac{0.5}{2}=0.25\)
Vdc = Duty ratio x Vs = 0.25 x 24 = 6V.

Question 17.
Realise NOT and OR-gate using NOR-gate
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 2

Question 18.
Distinguish between uplink and downlink signals
Answer:

Uplink Downlink
1)  Signal transmitted from ground station to satellite
2) Frequency range is 6 GHz
1) Signal transmitted from satellite to ground station.
2) Frequency range is 4 GHz.

Part – C

Answer any five questions.  5 x 3 = 15

Question 19.
What is a DC load line? Mention any two advantages of voltage divider bias.
Answer:
Operating point is the zero signal values of collector Ic and collector to emitter voltage VCE of a transistor. DC load line is a straight line drawn on the output characteristics representing output DC voltage and corresponding direct current under no signal conditions.

2nd PUC Electronics Previous Year Question Paper March 2017

The operating point does not depend upon the value of β of the transistor. Hence the operating point does not change its position due to rise in temperature or replacing a transistor of different p value. Hence voltage divider bias provides excellent stabilisation and is preferred to other biasing methods.

Question 20.
Calculate the input impedance of a negative feedback amplifier if input impedance without feedback is 10 KQ. Given A = 100 and β = 0.01.
Answer:
Zif = Zi(1 +Aβ)
= 10 x 103 (1 + 100 x 0.01)
= 20 x 103 Ω
= 20kΩ

Question 21.
With block diagram, explain basic communication system.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 3

Question 22.
Draw the equivalent circuit of transmission lines for low frequency. Mention any two types of antennas.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 4
Types of Antenna:

  • Helical antenna
  • Yagi antenna
  • Loop antenna

Question 23.
Write the circuit diagram, input and output waveforms of SCR halfwave rectifier with RC triggering circuit.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 5
The SCR is connected with a diode bridge rectifier. The rectifier circuit converts AC to a unidirectional current through the thyristor. The voltage on the capacitor follows the diode rectifier waveform because RC circuit is connected to diode rectifier. During each half cycle when the voltage across the capacitor reaches trigger level which is just enough to supply gate trigger current to thyristor, then thyristor starts conducting. Firing angle \(\alpha=\left(\frac{x}{\mathrm{y}}\right)_{180}\)
2nd PUC Electronics Previous Year Question Paper March 2017 6

2nd PUC Electronics Previous Year Question Paper March 2017

Question 24.
Draw the labelled block diagram of microcontroller.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 7

Question 25.
How do you represent.
(i) logical AND
(ii) logical OR
(iii) logical NOT operators in C programming?
Answer:
Internet is worldwide interconnection of millions of computers by means of complex network which serves as an inexpensive communication medium.

  1. Long-distance telephone and cable TV systems.
  2. To provide LAN connections.
  3. Closed-circuit TV systems used for security.
  4. Aircraft communication and controls.

Question 26.
What is internet? Write few applications of fibre optic communication system.
Answer:
Internet

  1. Using internet, access to required information is easy, economical, reliable and fast.
  2. With E-mail, messages reach destination with in minutes.
  3. E-mail can be sent and received from any place.
  4. Using E-mail, message can be sent to several persons simultaneously.

Applications

  1. Long-distance telephone and cable TV systems.
  2. To provide LAN connections.
  3. Closed-circuit TV systems used for security.
  4. Aircraft communication and controls.

Part – D

Answer any Three questions:   3 x 5 = 15

Question 27.
For the given CE amplifier circuit using silicon transistor. Calculate
i) Voltage across R2
ii) IE
iii) Zin(base)
iv) Zin (and)
v) Zo
Given \(\text { Given } r^{\prime} e=\frac{26 m V}{I_{E}}\) and β = 100
2nd PUC Electronics Previous Year Question Paper March 2017 8
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 9
Zin = R1 || R2|| Zin(base) =1.38kΩ = 2kΩ
Zb =Rc || RL =(10kΩ) || (10kΩ) = 5kΩ

2nd PUC Electronics Previous Year Question Paper March 2017

Question 28.
Calculate the output voltage if V1= 300mV and V2 = 700 mV in the following circuit.
2nd PUC Electronics Previous Year Question Paper March 2017 10
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 11

Question 29.
A Hortley oscillator oscillates at 15 KHz. If the capacitor in the tank circuit has a value of 0.01 pF and one of the inductors value is 1 mH, calculate the value of the other inductor.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 12
L1 + L2 = LT= 11.25 mH
L,1+ 1mH= 11.25mH, L1 = 10.25mH

Question 30.
A frequency modulated signal is given by 10sin[6 x 108t + 5 sin 1250t].
Determine
i) Carrier frequency
ii) Modulating frequency
iii) Modulation index
iv) Maximum deviation
v) Carrier swing
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 13
Maximum frequency deviation = δ= mf fm. = 5 x 199.04= 995.2 Hz
Carrier swing = 28 = 2(995.2) = 1990.4 Hz.

Question 31.
Simplify the Boolean expression Y = sm(l,2,3,8,9,11,13) + sd(0,10,15) using K-map. Draw the logic diagram using NAND-gates to realise the simplified expression.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 14

Part – E

Answer any Four questions.  4 x 5 = 20

Question 32.
Give the comparison between CB, CC and CE amplifiers on the performance characteristics.
Answer:

Parameter Types of Amplifiers.
CE CB CC
Current gain High (P) Less than 1 Highest (1+ p)
Voltage gain High Moderate Low
Power gain Highest Moderate Moderate
Phase shift 180° 0-
Input impedance Moderate Low High
Output impedance Moderate High Low
Bandwidth Narrow Wide Wide
Applications Used as AF amplifies Used as RF amplifies impedance
matching

2nd PUC Electronics Previous Year Question Paper March 2017

Question 33.
What is a logarithmic amplifier? With circuit diagram, obtain an expression for output voltage of logarithmic amplifier using OP-amp.
Answer:
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 15
2nd PUC Electronics Previous Year Question Paper March 2017 16
∴ The output voltage is proportional to natural logarithm of input voltage.

Question 34.
With a labelled block diagram, explain the working of AM transmitter.
2nd PUC Electronics Previous Year Question Paper March 2017 17
Answer:
The transmitter performs modulation and raises the power level of a modulated wave to required level for effective radiation.

The microphone converts the audio signal into an equivalent audio electrical signal. The output is filtered to have a bandwidth of 10kHz.

The pre amplifier provides the required voltage amplification. The driver amplifier increases the power level of the signal as required by the high power modulation amplifier.

The high frequency carrier wave is generated by a crystal oscillator which has highest frequency stability. The Carrier signal is fed to a buffer amplifer which is a low gain, high input impedance amplifer which isolates crystal oscillator and the power level of the carrier signal to drive the modulated class C amplifier.

The modulating audio signal and carrier signal are applied to the modulator. The collector modulation is used for modulation in high power transmitter. The transmitting antenna transmits the signal.

Question 35.
Explain with circuit diagram and truth table, the working of clocked SR flip flop using NAND gates.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 18
It is constructed using inverters inserted into inputs of cross coupled NAND gates.
Working:

  1. When S=0, R=0, it does not respond and hence outputs Q and Q will remain in their previous state. This is called HOLD condition.
  2. When S=1 and R=0, the output Q and Q change to 1 and 0. This condition is called SET state.
  3. When S=0, R=1, the output Q and Q change to 0 and 1. This condition is called RESET state.
  4. When S=1 and R=l, it drives output Q and Q both to HIGH which is FORBIDDEN or INVALID condition.

2nd PUC Electronics Previous Year Question Paper March 2017 19

2nd PUC Electronics Previous Year Question Paper March 2017

Question 36.
Write an assembly language instructions to move 45H into register A and 5 EH into register R0. Then add them together and save the result in Rt. What is the content of R, after the execution of the program.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 20

Question 37.
Write a C program to accept three integer and find their sum and average. Find the sum and average of 5, 6 and 7.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2017 21

2nd PUC Electronics Previous Year Question Paper June 2018

Students can Download 2nd PUC Electronics Previous Year Question Paper June 2018, Karnataka 2nd PUC Electronics Question Bank with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.

Karnataka 2nd PUC Electronics Previous Year Question Paper June 2018

2nd PUC Electronics Previous Year Question Paper June 2018

Time : 3 hrs. 15 min.
Max Marks: 70

Instructions:

  • The question has five Parts A, B, C and D.
  • Part – A has no choice
  • Part – D has two parts. Part -1 is from problems, Part – II is of essay type questions.
  • Circuit diagram/timing diagram/truth tables are drawn wherever necessary.
  • Problems without necessary formula/formulae carry no marks.

Part – A

Answer all questions: 10 x 1 = 10

Question 1.
Expand JFET.
Answer:
Junction Field Effect Transistor.

Question 2.
Define CMRR.
Answer:
CMRR is the ratio of differential mode gain to common mode gain.

Question 3.
How many frequency components are present in amplitude modulated wave?
Answer:
3

Question 4.
Mention any one application of digital communication system.
Answer:
TV transmission or mobile signal transmission.

Question 5.
Draw the circuit symbol of TRIAC.
Answer:

Question 6.
Write Excess-3 code of (26)10.
Answer:
(26)10 = (010110O1)2

Question 7.
What is a Full-Adder?
Answer:
It is circuit that performs arithmetic sum of 3 binary bits.

Question 8.
Give the meaning of CLR A.
Answer:
Clear the content of Accumulator.

2nd PUC Electronics Previous Year Question Paper June 2018

Question 9.
Write the C-equivalent expression for the mathematical expression
Answer:
(X * Y) / Z

Question 10.
What is Transponder?
Answer:
Transponder is transmitter receiver combination in a satellite.

Part – B

Answer any five questions.  5 x 2 = 10

Question 11.
Define amplification factor. Write its relation with rd and gm.
Answer:
Amplification factor is the ratio of small change in drain to source voltage to the corresponding change in Gate to source voltage for a constant drain current.
ICBO and ICEO

Question 12.
Write the steps involved in drawing AC equivalent circuit of an amplifier.
Answer:

  • Reduce all dc sources to zero.
  • Short all capacitors.

Question 13.
The open loop gain and closed loop gain of an amplifier are 100 and 50 respectively. Calculate the feedback fraction.
Answer:
Aβ = 100
Af = 50
\(\mathrm{Af}=\frac{\mathrm{A}}{1+\mathrm{A} \beta}\)
β = 0.01

Question 14.
Write any two advantages of negative feedback.
Answer:

  • Stabilisation of Gain
  • Increase in the bandwidth

2nd PUC Electronics Previous Year Question Paper June 2018

Question 15.
Draw the neat circuit diagram of Wein-bridge oscillator.
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 1
Voltage gain A = \(1+\frac{\mathrm{R}_{3}}{\mathrm{R}_{4}}=3\)

Question 16.
Explain double-injection meahanism in power diode.
Answer:
At higher forward bias, the holes from p+ region reach n~ n+junction and attract electrons from n+ cathode. This leads to electron injection into n~ drift region from n+ cathode layer. This mechanism is called double injection method.

Question 17.
Realize XOR gate using only NAND gates.
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 2

Question 18.
Mention any two applications of bluetooth.
Answer:

  • Wireless communication between PC or laptops or cell phones.
  • Used in wireless audio head sets.

Part – C

Answer any five questions.  5 x 3 = 15

Question 19.
What is meant by leakage current? Name two types of leakage currents.
Answer:
The flow of current through the device due to the motion of minority charge carriers under reverse bias condition is called leakage current.
ICBO and ICEO

2nd PUC Electronics Previous Year Question Paper June 2018

Question 20.
What is Ionosphere? Explain F-layer.
Answer:
Ultraviolet radiation from the sun cause the upper atmosphere to ionize i.e. to become electrically charged. Hence a thick layer of ions formed at heights of 50 km to 400km. The ionosphere supports MF and HF wave propagation.
Its three layers are:

D layer: It is at a height of 70 km and has an average thickness of 10 km. It disappears in the night time. It reflects VLF and LF waves and absorbs MF and HF waves.

E layer: It is at a height of 100 km with a thickness of 25 km. This layer disappears at night. It helps in MF and HF wave propagation.

F layer: It is at a height of 150 km and extends upto 400 km. This layer exists during both day and night time. During day time, it splits into two layers F, and F2, and combines to form a single F layer during night time.

F2 region. 250-400 km.
F1 region. 160-250 km.
E region. 95-130 km
D region. 50-95 km.
Troposphere Earth.

Question 21.
With a neat circuit diagram explain linear diode detector.
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 3
LC tank circuit is used as a parallel resonant circuit. The resonant frequency of the circuit can be varied by varying the value of capacitance C and hence RF signal of any desired frequency can be tuned in.

When a selected modulated signal is applied to the diode, the diode conducts only during the positive half of the modulated wave. Thus the diode removes the entire negative half cycles. Across R1C1 only positive half cycles of carrier modulated wave appears. Thus the low pass filter made up of R1 C1 removes the RF.

During positive half cycle, diode conducts the capacitor C1 gets charged. During negative half cycle of the carrier and diode doesnot conduct but C1 discharges through R1. Hence output is obtained. The spikes can be reduced by proper choice of R1 C1 and depth of modulation. The capacitor CB removes Dc component produced by the detector.

Question 22.
Draw the circuit diagram, gate pluses and load voltage waveform of power inverter.
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 4

Question 23.
Determine Vdc and Idc of SCR full wave frectifier. Given firing angle is 60°. The rms voltage of ac input to the rectifier is 150V, when load resistance of 15Ω is connected.
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 5

Question 24.
Name the addressing modes of the following instructions:
(i) MOV R2, A
(ii) MOV A, 25H
(iii) MOV A, @ R0.
Answer:
(i) Register Addressing mode
(ii) Direct Addressing mode
(iii) Indirect Addressing mode

2nd PUC Electronics Previous Year Question Paper June 2018

Question 25.
What is Debugging in C-program? Write the syntax of the if else statement.
Answer:
Debugging is detecting and correcting errors.
if (condition)
{
statement – 1 ;
}
else
{
statement -2;
}

Question 26.
Draw the block diagram of RADAR system and mention the function of duplexer.
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 6

  • Transmitter: The radar transmitter produces high-frequency RF pulses and is transmitted into space by the antenna.
  • Duplexer: It switches the antenna between transmitter and receiver alternately. This is required because high power pulses of the transmitter will destroy the receiver if energy were allowed to enter the receiver.
  • Receiver: It amplifies and demodulates the received RF signals. It provides video signals on the output.
  • Radar antenna: The antenna transfers the transmitting signal to space with the required distribution and efficiency.

Part – D

Answer any Three questions:  3 x 5 = 15

Question 27.
For the CE amplifier circuit shown below, find:
(i) Voltage drop across 8.2 Ω
(ii) IZ
(iii) re
(iv) Zin(base)
(v) Z out

2nd PUC Electronics Previous Year Question Paper June 2018 7
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 8

2nd PUC Electronics Previous Year Question Paper June 2018

Question 28.
Find the output voltage ‘V0‘ for the following circuit: Given: V1, = IV, V2 = 2V, V3 = -1 V
2nd PUC Electronics Previous Year Question Paper June 2018 9
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 10
2nd PUC Electronics Previous Year Question Paper June 2018 11

Question 29.
Calculate the frequency and feedback fraction of the circuit shown below:
2nd PUC Electronics Previous Year Question Paper June 2018 12
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 13

Question 30.
A 100 KW carrier power is amplitude modulated at 50% depth of modulation by a sinusoidal modulating signal. Calculate:
(i) Total power
(ii) Sideband power
(iii) Power in each sideband.
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 14

Question 31.
Simplify the following Boolean expression by using K-MAP. If(A, B, C, D) = Σm(0, 1, 2, 4, 5, 8, 9, 10, 12, 13) Draw the logic circuit for the simplified expression using only NAND gates.
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 15

Part – E

Answer any Four questions.   4 x 5 = 20

Question 32.
Explain with circuit diagram the working of class-B Push-Pull power amplifier.
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 16
Class B push-pull amplifier is as shown in the diagram. T1 and T2 are two centre tapped transformers and Q1, Q2 are two identical transistors. Transformer T1 produces signal voltages V1 and V2 which are 180° out of phase with each other.

These two signals are applied to the Polarities reverse during negative half cycle of input voltage. Q2then is ON and Q1 is OFF. Q2amplifies the signal and the alternate half cycle appears across the loud speaker.

two transistors. Transformer T2 couples AC output signal from collector to loud speaker. The two emitters are connected to centre tap of transformer T1 secondary and Vcc to the centre tap of T2 secondary.

During positive half cycle of input voltage, secondary winding of T1 has voltages V, and V2. Transistor Q1, conducts and Q2 is cut off. The collector current through Q1 produces an amplified and inverted voltage which applied to loud speaker through a transformer.

2nd PUC Electronics Previous Year Question Paper June 2018

Question 33.
What is a differentiator? With the help of circuit diagram obtain an expression for
output voltage of OP-AMP differentiator.
Answer:
2nd PUC Electronics Previous Year Question Paper June 2018 17
2nd PUC Electronics Previous Year Question Paper June 2018 18

Question 34.
Along with waveforms, derive an expression for instantaneous voltage of frequency modulated wave.
Answer:
Frequency modulation is the process of varying the frequency of high frequency carrier wave in accordance with instantaneous amplitude of the modulating signal.
Let the modulating signal be given by vm=vm coswt.
Where w is the angular frequency and vm is the peak amplitude. Let the carrier voltage be given by the equation vc= vcsin (Wct +Ø) where wc is the angular frequency of the carrier and Vc is the peak amplitude of the carrier phase angle θ = Wct + θ.
This is instantaneous phase angle of carrier voltage.
Then carrier voltage Vc = Vc sin Ø
The angular frequency \(\omega _{ c }=\frac { d\emptyset }{ dt }\)
or Ø = ∫ ωdt
The angular frequency of carrier after modulation is
ω = ω + kvm
ω = ω+ kVmcos ωt.
Where K is a constant of proportionality called as the modulation deviation constant. On integrating,
2nd PUC Electronics Previous Year Question Paper June 2018 19

Question 35.
Explain the working of four bit synchronous up counter with the help of logic diagram. Write its truth table.
2nd PUC Electronics Previous Year Question Paper June 2018 20
Answer:
Counter is a logic circuit used for counting the pulses. It is a set of flip flops whose state changes in response to pulses applied to their inputs.

Counters are of two types:

  • Synchronous counters and
  • Asynchronous counters.

2nd PUC Electronics Previous Year Question Paper June 2018 21

In a synchronous circuit, the clock signal is applied to all flip flops simultaneously.

Question 36.
Write an assembly language program to multiply 08 H and OB H. What are the contents of register A and register B after the execution of the program?
Answer:
MOV A, # 08H → Load the number 08H into the accumulator.
MOV B, # OBH → Load the number OBH into register B.
MOV AB → 08H  OBH
08H= 1000(2)              0BH=1011(2)
1000 x 1011 =01011000(2) = 58H
∴ A = 58H    B = OOH

2nd PUC Electronics Previous Year Question Paper June 2018

Question 32.
Write a C-program to find the sum of first n
Answer:
# include <stdio.h>
# include < conico.h>
main ( )
{
int n, i, sum = 0;
printf (” Enter the value of n”);
scanf(” % d”, & n);
i= i;
while (i< = n)
{
sum = sum + i; i + +;
}
printf(“The sum = %d”, sum); getch  ( );
}

2nd PUC Electronics Previous Year Question Paper March 2018

Students can Download 2nd PUC Electronics Previous Year Question Paper March 2018, Karnataka 2nd PUC Electronics Question Bank with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.

Karnataka 2nd PUC Electronics Previous Year Question Paper March 2018

2nd PUC Electronics Previous Year Question Paper March 2018

Time : 3 hrs. 15 min.
Max Marks: 70

Instructions:

  • The question has five Parts A, B, C and D.
  • Part – A has no choice
  • Part – D has two parts. Part -1 is from problems, Part – II is of essay type questions.
  • Circuit diagram/timing diagram/truth tables are drawn wherever necessary.
  • Problems without necessary formula/formulae carry no marks.

Part – A

Answer all questions: 10 x 1 = 10

Question 1.
Define Pinch off voltage.
Answer:
Pinch off voltage is the drain to source voltage in JFET at which the drain current reaches constant satenation level.

Question 2.
What is the input impedance of an ideal op-amp?
Answer:
Input impedance, Zin = ∞

Question 3.
Mention the number of sidebands present in an AM wave.
Answer:
2 sidebands.

2nd PUC Electronics Previous Year Question Paper March 2018

Question 4.
Define frequency modulation.
Answer:
Frequency modulation is the process in which the frequency of the carrier is varied in accordance with the modulating signal, keeping amplitude and phase of carrier wave constant.

Question 5.
Expand MOSFET.
Answer:
Metal Oxide Semiconductor Field Effect Transistor.

Question 6.
Convert (1001)G to binary code.
Answer:
(1001)G = (1110)2

Question 7.
Draw the symbol of XOR-gate.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 1

Question 8.
Write the meaning of MOV Rs, A.
Answer:
Copy the content of accumulator (register A) to R5

2nd PUC Electronics Previous Year Question Paper March 2018

Question 9.
If a = 6 and b = 9, what is the content of a after the execution of a+ = b in C programming?
Answer:
a = 6 + 9 = 15

Question 10.
What is cell splitting?
Answer:
Cell splitting is the process of dividing the geographical area into many {smaller areas.

Part – B

Answer any Five questions.  5 x 2 = 10

Question 11.
Derive the relation μ = gm x rd
Answer:

  • Ac drain resistance (rd) is the ratio of small change in drain to source voltage VDS to the corresponding change in drain current (ID) for a constant VGS.
  • Transconductance (gm) is the ratio of change in drain current ID to the corresponding change in gate to source voltage VGS for a constant VDS.

Question 12.
Mention any two characteristics of CC amplifier.
Answer:

  • Voltage gain is nearly equal to 1
  • Input and output signals are in phase

Question 13.
Draw the block diagrams of voltage shunt and current series negative feedback.
Answer:
1.Voltage series negative feedback.
2nd PUC Electronics Previous Year Question Paper March 2018 2

2. Voltage shunt negative feedback:
2nd PUC Electronics Previous Year Question Paper March 2018 3

3.Current series negative feedback:
2nd PUC Electronics Previous Year Question Paper March 2018 4

4. Current shunt negative feedback:
2nd PUC Electronics Previous Year Question Paper March 2018 5

2nd PUC Electronics Previous Year Question Paper March 2018

Question 14.
An amplifier has Z0 = 10KQ, voltage gain A = 150 and P = 0.02. Find the output impedance of feedback amplifier.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 6

Question 15.
Write the pin diagram of IC-555 timer.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 7

Question 16.
Mention the four modes of operation of TRIAC.
Answer:
A triac can conduct in both the directions. The conduction of a triac is initiated by injecting a current pulse into the gate terminal. The gate loses control over the conduction once TRIAC is turned ON. The TRIAC turns OFF only when the current through the main terminals becomes zero.
2nd PUC Electronics Previous Year Question Paper March 2018 8
The three terminals of TRIAC are marked MT, (Main terminal 1), MT2 (Main terminal 2) and the gate G. As TRIAC is a bidirectional device and can have its terminals at various combinations of positive and negative voltages, there are four possible electrons potential combinations, as given below:

  1. MT2 positive with respect to MT1, G positive with respect to MT1.
  2. MT2 positive with respect to MT1, G negative with respect to MT1.
  3. MT2 negative with respect to MT1, G negative with respect to MT1.
  4. MT2 negative with respect to MT1, G positive with respect to MT1.

In trigger mode-1, the gate current IG, flows mainly through P2N2 junction like an ordinary thyristor. When the gate current has injected sufficient charge into P2 layer, the TRIAC starts conducting through the P1, N1, P2, N2, layers like an ordinary thyristor.

In trigger mode-3, the gate current IG forward biases the P2 P3 junction and large number of electrons are introduced in the P2 region by Nr Finally the structure P2 N1, P1, N4 turns on completely.

Question 17.
What is a half subtractor? Write its truth table.
Answer:
Half subtractor.
2nd PUC Electronics Previous Year Question Paper March 2018 9

Inputs Outputs
A B Difference Borrow
0 0 0 0
0 1 1 1
1 0 1 0
1 1 0 0

2nd PUC Electronics Previous Year Question Paper March 2018

Question 18.
Give any two applications if Wi-Fi.
Answer:

  1. Wi-Fi is used to access the internet via hotspots with a laptop computer.
  2. It is one of the most reliable, flexible and affordable wireless networking technology.
  3. Wi-Fi allows cheaper deployment of local area network in outdoor areas like historical buildings.
  4. The price of chipsets for Wi-Fi continues to drop, making it an economical networking operation.
  5. The standard Wi-Fi device will work anywhere in the world.

Part – C

Answer Any FiveQuestions

Question 19.
Define the terms:
(i) Thermal runaway
(ii) Leakage current
(iii) Heat sink.
Answer:
(i) The self destruction of an unbiased transistor due to increase in temparature and hence increase in leakage current is called thermal runaway.

(ii) Leakage current is the current through a device due to the motion of minority charge carriers under reverse biased condition.

(iii) Heat sink is a device which absorbs the unnecessary heat generated in the transistor and radiates it to surroundings and protects it.

Question 20.
Explain the three modes of radio wave propagation.
Answer:

  • Ground Waves
  • Space Waves
  • Skywaves

Question 21.
Draw the equivalent circuit of transmission lines for high frequency. Mention any two uses of microstrip antenna.
Answer:
For low frequency
2nd PUC Electronics Previous Year Question Paper March 2018 10
Primary constants:

  • The series resistance per unit length R is proportional to the square root of frequency.
  • The inductance L per unit length for a 2 wire T-line is \(\mathrm{L}=\frac{\mu}{2} \log \left(\frac{2 \mathrm{D}}{\mathrm{d}}\right)\) where pt is the permeability.D is distance between two wires. And d is diameter of each wire.
  • The capacitance C per unit length,
    \(C=\cfrac{\mu}{\log \frac{2 D}{d}}\)
  • Where e is the permittivity of free space, D is distance between 2 wires and d is the distance between the plates of capacitor.

Secondary constants of T-line:

  • The series impedance of T-line is Z=R+jwL.
  • The shunt admittance of T-line is y=G+JWC are the two secondary constants.

Question 22.
Explain the operation of power diode under forward biased condition.
Answer:
Power diodes of largest power rating are required to conduct several kilo amps of current in the forward direction with very little power loss while blocking several kilovolt in the reverse direction. Large blocking voltage requires wide depletion region. Charge density in the depletion layer should also below in order to get a wide depletion region. For these two requirements, drift layer is introduced between two heavily doped p and n layers.
\(\mathrm{V}_{\mathrm{m}}=\sqrt{2} \mathrm{V}_{\mathrm{rms}}=\sqrt{2} \times 30=42.42 \mathrm{V}\)

Question 23.
Determine Vdc and Idc of SCR half wave rectifier. Given firing angle is 30° and rms voltage of ac input to the rectifier is 30V and load is 10Ω.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 11

Question 24.
Mention any three features of PIC microcontroller.
Answer:
24/35 I/O pins with individual direction control:

  • High current source/sink for direct LED drive
  • Interrupt-on-Change pin
  • Individually programmable weak pull-ups
  • Ultra Low-Power Wake-up (ULPWU)

Analog Comparator module with:

  • Two analog comparators
  • Programmable on-chip voltage reference (CVREF) module (% of VDD)
  • Fixed voltage reference (0.6V)
  • Comparator inputs and outputs externally accessible
  • SR Latch mode
  • External Timer 1 Gate (count enable)

A/D Converter:

  • 10-bit resolution and 11/14 channels
  • Timer O: 8-bit timer/counter with 8-bit programmable prescaler

Enhanced Timer 1:

  • 16-bit timer/counter with prescaler
  • External Gate Input mode
  • Dedicated low-power 32 kHz oscillator

Timer2: 8-bit timer/counter with 8-bit period register, prescaler and postscaler

2nd PUC Electronics Previous Year Question Paper March 2018

Enhanced Capture, Compare, PWM+ module:

  • 16-bit Capture, max. resolution 12.5 ns
  • Compare, max. resolution 200 ns
  • 10-bit PWM with 1, 2 or 4 output channels, programmable “dead time”, max. frequency 20 kHz
  • PWM output steering control

Capture, Compare, PWM module:

  • 16-bit Capture, max. resolution 12.5 ns
  • 16-bit Compare, max. resolution 200 ns
  • 10-bit PWM, max. frequency 20 kHz

Enhanced USART module:

  • Supports RS-485, RS-232, and LIN 2.0
  • Auto-Baud Detect
  • Auto-Wake-Up on Start bit
  • In-Circuit Serial Programming TM (ICSPTM) via two pins
  • Master Synchronous Serial Port (MSSP) module – supporting 3-wire SPI (all 4 modes) and 12C™ Master and Slave Modes with I2C address mask

2nd PUC Electronics Previous Year Question Paper March 2018

Question 8.
Briefly explain different addressing modes in the 8051.
Answer:
There are four addressing modes in 8051.

  • Immediate addressing mode: the data source is available immediately as a part of instruction itself. Example: MOV A, #8bit data
  • Register addressing mode: the source and destination register names are parts of the opcode in instruction. Example: MOV A, R0
  • Direct addressing mode: the source and/or destination may be the internal RAM locations. Example: MOV 90h, #50h
  • Indirect addressing mode: the source or destination address may be indicated the content of index register. Example: MOV @Rl,#40h

Question 25.
For a 8-bit computer, if A = 0000 0101 and B = 0011 0100. Compute the following bitwise operators.
(i) A & B
(ii) A | B
(iii) A ∧ B
Answer:
A&B = 0000 0100 A | B = 0011 0101 A∧B = 0011 0001

Question 26.
Explain with diagram, the working of a satellite transponder system.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 12

Part – D

Answer any Three question  3 x 5 = 15

Question 27.
For the CE amplifier using silicon transistor given below, calculate
(i) Voltage across R2
(ii) Emitter current IE
(iii) Voltage gain Av
(iv) Power gain Ap Given that \(r_{e}^{\prime}=\frac{26 \mathrm{mV}}{\mathrm{I}_{\mathrm{E}}} \text { and } \beta=100\)
2nd PUC Electronics Previous Year Question Paper March 2018 13
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 14

Question 28.
Calculate output voltage V0for the circuit given below.
2nd PUC Electronics Previous Year Question Paper March 2018 15
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 16

Question 29.
A Colpitts oscillator circuit generates a frequency of 24 KHz. The capacitors used in the tank circuit are Ct = 0.2pF and C2 = 0.22pF. Calculate the value of an inductor L and feedback factor β.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 17

2nd PUC Electronics Previous Year Question Paper March 2018

Question 30.
The output of an AM transmitter is given by 400[1 + 0.4 sin(6280) t] sin(3.14 x 107f). This voltage is fed to an antenna of resistance 500Ω. Determine

  • Carrier frequency
  • Modulating frequency
  • Carrier power
  • Mean power output.

Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 18

Question 31.
Simplify the Boolean expression Y =∑m (0,2,6,8,10,12,13,14) + ∑d (4,9) using K-map. Draw the NAND-gate equivalent circuit to realize the simplified expression.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 19

Part – E

Answer any Four questions.       4 x 5 = 20

Question 32.
Draw the circuit diagram of two stage RC-coupled amplifier. Explain its frequency response.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 20
RC coupling is most widely used method of coupling signal from one stage to next stage in multistage amplifiers. The two stage RC coupled amplifier is as shown in the diagram. The signal developed across the collector resistor Rc of the first stage is capacitively coupled to the input of second stage through the coupling capacitor Cc.

RC coupled transistor amplifier is widely used as it provides excellent audio fidelity over wide range of frequency.

R1R2,Rc,RE provide biasing resistors. RE provides stabilisation and CE is used for bypassing ac across Rg.

Working:

When an AC signal is applied to the input of first stage, it gets amplified and appears at its output with a phase reversal of 180°. Through the coupling capacitor Cc, the amplified signal is fed to the input of second stage.

Cc blocks DC and allows AC to pass through. The second stage further amplifies the signal, further providing a phase reversal of 180° with respect to its input. The input and output signal are in phase as the signal is reversed twice. Overall gain of RC coupled amplifier is the product of gain of individual stages.
2nd PUC Electronics Previous Year Question Paper March 2018 21
At low frequencies, reactance of coupling capacitor is high. Hence it allows only a small part of the signal to pass from one stage to next stage. Hence gain is low at low frequencies. At high frequencies, the coupling capacitor Cc offers low reactance and acts like a short. Hence loading effect of next stage increases and the gain decreases.
In mid frequency range, as frequency increases, the capacitive reactance of coupling capacitor decreases, which tries to increase gain. As capacitive reactance decreases, due to loading effect of next stage, the gain reduces. Hence, voltage gain is constant.

2nd PUC Electronics Previous Year Question Paper March 2018

Question 33.
What is an integrator? With circuit diagram, obtain an expression for output voltage of an op-amp integrator.
Answer.
2nd PUC Electronics Previous Year Question Paper March 2018 22
Integrator is a circuit whose output is proportional to integral of its input.

Question 34.
With a labelled block diagram explain the working of FM superhetrodyne radio receiver.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 23

when turned to the desired frequency. The RF amplifier is designed to handle large bandwidth of 150 kHz.

Mixer: the incoming RF signal of frequency fm is applied to a mixer which also receives the output from the local oscillator. A new frequency called intermediate frequency IF is produced whose value is difference of local oscillator signal f and signal frequency f.

Local oscillator: the receiver converts incoming carrier frequency to the IF by using local oscillator frequency higher than incoming tuned frequency. Colpitts oscillator is used as the local oscillator.

IF amplifier: IF signal is amplified by one or more number of amplifiers, which raises the strength of IF signal. It has multistage class A amplifier providing better selectivity and gain.

Limiter: It removes all the amplitude variation in FM signal caused by noise. Differential amplifiers are preferred for limiter.

Discriminator: It recovers the modulating signal from the IF signal. It converts frequency variation into corresponding voltage variation and produces the modulating signal. De-emphasis network: It reduces the relative amplitude of high frequency signals that are boosted in the transmitter and brings them back to their original level.

AF amplifier: It amplifier the modulating signal recovered by the FM detector. The speaker converts the electrical signal into sound signal.

Question 35.
(a) What is a register? Mention the different types of shift registers.
Answer:

  • Serial-in, serial-out.
  • Serial-in, parallel-out
  • Parallel-in, serial-out.
  • Parallel-in, parallel-out.

(b) Draw the logic diagram of clocked SR flip-flop.
Answer:

2nd PUC Electronics Previous Year Question Paper March 2018 24
It is constructed using inverters inserted into inputs of cross coupled NAND gates.
Working:

  1. When S=0, R=0, it does not respond and hence outputs Q and Q will remain in their previous state. This is called HOLD condition.
  2. When S=1 and R=0, the output Q and Q change to 1 and 0. This condition is called SET state.
  3. When S=0, R=1, the output Q and Q change to 0 and 1. This condition is called RESET state.
  4. When S=1 and R=l, it drives output Q and Q both to HIGH which is FORBIDDEN or INVALID condition.

2nd PUC Electronics Previous Year Question Paper March 2018 25

Question 36.
Write an assembly language program to subtract 23 H from 3 F H when CY = 0 and save the result in Rs.
Answer:
2nd PUC Electronics Previous Year Question Paper March 2018 26

2nd PUC Electronics Previous Year Question Paper March 2018

Question 37.
Write a C program to accept the radius of a circle and compute its area and perimeter.
Answer:
# include < stdio.h>
# include <conio.h>
void main ( )
{
float radius, area, perimeter, PI = 3.142; clrscr ( );
printf (“Enter the radius\n”); scanf (“%f’, & radius);
Area = PI * radius * radius;
Perimeter = 2.0 * PI * radius;
printf (“Area of circle is % f \n”, Area);
printf (“perimeter of the circle is % f \n”, perimeter); getch ( );
}

2nd PUC Electronics Model Question Paper 3 with Answers

Students can Download 2nd PUC Electronics Model Question Paper 3 with Answers, Karnataka 2nd PUC Electronics Model Question Papers with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.

Karnataka 2nd PUC Electronics Model Question Paper 3 with Answers

Max Marks: 70
Time : 3 hrs. 15min.

Part – A

Answer all questions: 10 x 1 = 10   

Question 1.
How many pn junctions are present in JFET?
Answer:
Two

Question 2.
Define DC load line.
Answer:
DC load line is a staight line on the output characteristics representing output dc voltage and corresponding direct current under no signal condition.

Question 3.
Draw the circuir diagram of a four bit R – 2R ladder network DAC.
Answer:
2nd PUC Electronics Model Question Paper 3 with Answers 1

Question 4.
Define modulation index of an AM wave.
Answer:
Modulation index of AM is the ratio of amplitide of modulating signal to that of carrier wave.

2nd PUC Electronics Model Question Paper 3 with Answers

Question 5.
How many sidebands are present in FM wave?
Answer:
Infinity

Question 6.
Mention one application of TRIAC.
Answer:
Light Dimmer.

Question 7.
Write the Boolean expression of XNOR gate.
Answer:
\(\mathrm{Y}=\mathrm{AB}+\overline{\mathrm{A}} \overline{\mathrm{B}}\)

Question 8.
Write the excess – 3 code of (304)10
Answer:
Oil 000110111 in Excess 3 code.

Question 9.
Which sign is used in as mnemonics for indirect addressing mode?
Answer:
@

Question 10.
Name the standard input and output functions used in C.
Answer:
Printf and scanf.

Part – B

Answer any five questions.   5 x 2 = 10

Question 11.
Write the advantages of voltage divider bias circuit.
Answer:
Voltage divider bias is the method of biasing a transistor. The voltage drop across forword biases the base emitter junction. This causes the base current and hence collector current to flow in zero signal condition and establishes operating point.

Advantages:

  • It offers excellent stabilisation and hence Q point does not shift.
  • when used in amplifiers, it provides better amplification.

Question 12.
Mention the steps involved in drawing dc equivalent circuit of an amplifier.
Answer:

  • Reduce all the AC sources to zero.
  • open all the capacitors.

2nd PUC Electronics Model Question Paper 3 with Answers

Question 13.
Draw the block diagrams of voltage series negative feedback and current shunt negative
feedback.
Answer:
(i) Current shunt negative feedback.
2nd PUC Electronics Model Question Paper 3 with Answers 2

(ii) Voltage series negative feedback.
2nd PUC Electronics Model Question Paper 3 with Answers 3

Question 14
Expand CMRR? Give its value for ideal op-amp.
Answer:
CMRR = Common mode Rejection Ratio
CMRR is infinity for Ideal Opamp.

Question 15.
Explain briefly the conditions of barkhausen criterion.
Answer:

  • The total phase shift around the closed loop should be 0° or 360°.
  • The magnitude of product of the open loop gain of the amplifier (A) and feedback ratio (P) is unity. Ie, | Aβ |= 1 .

Question 16.
What is the difference between MOVC and MOVX instructions of 8051?
Answer:
MOVX transfers data between’Accumulator and external data memory.
MOVC moves the byte from the code or program memory to the Accumulator

2nd PUC Electronics Model Question Paper 3 with Answers

Question 17.
List the features of C language.
Answer:
C is a powerful, flexible language that has gained worldwide acceptance in recent years. C is concise, yet powerful in its scope. It is a high-level language that also incorporates features of low-level languages. It is becoming the standard for program development on small machines and microcomputers.

It is possible to apply C to nearly all application areas. Modularity {process of dividing problems into sub-problems) makes C ideal for projects involving several programmers. C permits nearly every programming technique. C is widely available for most brands and type of computers. It is portable. With all the features C is not a difficult language, it is one of the easiest languages to learn and implement.

C programming can be used to write any complex program because of its rich set of built-in functions and operations. C compiler combines the capabilities of an assembly language with the feature of high-level language and therefore it is very much suited for uniting both system software and business packages. Because of its variety of data types, powerful operator programs in C are efficient and fast. C has the ability to extend, it means user-defined functions can also be added to C library.

Question 18.
Distinguish between uplink and downlink signals.
Answer:
The transmission of a signal from an earth station to a satellite is called uplink. The retransmission of a signal from a satellite to an earth station is called the downlink.

Part – C

Answer any five questions. 5 x 3 = 15

Question 19.
What are the functions of Drain, Source and Gate of JFET?
Answer:
Drain collects the charge carriers supplied by the source. Gate controls the flow of charge carriers through the channel.

2nd PUC Electronics Model Question Paper 3 with Answers

Question 20.
With a block diagram, derive an expression for input impedance of an amplifier with negative feedback.
Answer:
An amplifier should have high input impedance so that it will not load the preceding stage or input voltage source. High input impedance for an amplifier can be achieved with Voltage series negative feedback.

Let Ii and Vi be input current and input voltage to the basic amplifier. Vs is input to feedback amplifier, Vf is feedback voltage and vo is the output voltage.

Input impedance of basic amplifier is
\(z_{i}=\frac{V_{i}}{I_{i}}-(1)\)

Input impedance of feedback amplifier is
\(z_{v}=\frac{V_{s}}{I_{i}} \rightarrow(2)\)

Input voltage to basic amplifier with negative feedback is
2nd PUC Electronics Model Question Paper 3 with Answers 4
\(=\left(\frac{V_{i}}{I_{i}}\right)(1+A \beta)\)
Zif = Zi (1+Aβ)from eq ………… (1)
As (1 + Aβ) > 1 for negative feedback, Zif > Zi
Hence with negative feedback, input impedance of an amplifier increases.

Question 21.
Mention the characteristics of an ideal op-amp.
Answer:

Characteristics Ideal op amp Practical op – amp
open loop gain 105
Input impedance Few M Ω.
Output impedance 0 Few ohm.
Bandwidth Few MHz.
CMRR 90 dB

2nd PUC Electronics Model Question Paper 3 with Answers

Question 22.
Explain the importance of ionosphere in the radio communication.
Answer:
Ultraviolet radiation from the sun causes the upper atmosphere to ionize i.e. to become electrically charged. Hence a thick layer of ions formed at heights of 50 km to 400km. The ionosphere supports MF and HF wave propagation.
Its three layers are:

D layer: It is at a height of 70 km and has an average thickness of 10 km. It disappears in the night time. It reflects VLF and LF waves and absorbs MF and HF waves.

E layer: It is at a height of 100 km with a thickness of 25 km. This layer disappears at night. It helps in MF and HF wave propagation.

F layer: It is at a height of 150 km and extends up to 400 km. This layer exists during both day and night time. During day time, it splits into two layers F, and F2, and combines to form a single F layer during night time.

F2 region. 250-400 km.
F1 region. 160-250 km.
E region. 95-130 km
D region. 50-95 km.
Troposphere Earth.

Question 23.
Briefly explain the function of an AM diode detector.
2nd PUC Electronics Model Question Paper 3 with Answers 5
Answer:
LC tank circuit is used as a parallel resonant circuit. The resonant frequency of the circuit can be varied by varying the value of capacitance C and hence RF signal of any desired frequency can be tuned in.

When a selected modulated signal is applied to the diode, the diode conducts only during the positive half of the modulated wave. Thus the diode removes the entire negative half cycles. Across R1C1 only positive half cycles of carrier modulated wave appears. Thus the low pass filter made up of R1 C1 removes the RF.

During positive half cycle, diode conducts the capacitor C1 gets charged. During negative half cycle of the carrier and diode doesnot conduct but C1 discharges through R1. Hence output is obtained. The spikes can be reduced by proper choice of R1 C1 and depth of modulation. The capacitor CB removes Dc component produced by the detector.

2nd PUC Electronics Model Question Paper 3 with Answers

Question 24.
A silicon power diode has V. (the drop across the p+n junction) of 0.4V, RON (ohmic drop) in drift region of 0.002 Ω. Determine VAK if
(a) 1F = 75A and
(b) 1F = 100A.
Answer:
Vj= 0.4V, Ron = 0.002Q
VAK= Vj + VRD = Vj + RON If = 0.4 + 0.002 x 75 = 0.55V
VAK = Vj + VRD – Vj + RON If  = 0.4 + 0.002 x 100 = 0.6V.

Question 25.
What is half – adder? Draw the logic diagram and truth table of half adder.
Answer:

Inputs Outputs
A B Sum Y = A⊕B Carry Y = AB
0 0 0 0
0 1 1 0
1 0 1 0
1 1 0 1

2nd PUC Electronics Model Question Paper 3 with Answers 6

Question 26.
Mention any three uses of internet.
Answer:

  1. Using internet, access to required information is easy, economical, reliable and fast.
  2. With E-mail, messages reach destination with in minutes.
  3. E-mail can be sent and received from any place.
  4. Using E-mail, message can be sent to several persons simultaneously.

Part – D

Answer any Three questions :

Question 27.
For a CE amplifier circuit, R1 = 33kQ, R2 = 10kQ, Rc = 2.2kQ, RE = 1kQ, RL = 10kfi,
Vcc= 10kv, β=100,VBE = 0.7V. Find IE ,=Zin(base),Zo and Aand AP Consider
\(r_{ e }=\frac { 26mV }{ l_{ E } }\)
Answer:
2nd PUC Electronics Model Question Paper 3 with Answers 7

Question 28.
Calculate the output voltage in the circuit given below.
2nd PUC Electronics Model Question Paper 3 with Answers 8
Answer:
2nd PUC Electronics Model Question Paper 3 with Answers 9
2nd PUC Electronics Model Question Paper 3 with Answers 10

Question 29.
Calculate the frequency and feedback ratio of the circuit shown below.
2nd PUC Electronics Model Question Paper 3 with Answers 11
Answer:
2nd PUC Electronics Model Question Paper 3 with Answers 12

Question 30.
An FM signal of amplitude 20V with single tone modulation has a frequency deviation of 15 kHz and a band width of 40 kHz. Find the frequency of the modulating signal, modulation index and carrier swing. Write the expression of FM wave.
Answer:
2nd PUC Electronics Model Question Paper 3 with Answers 13

Question 31.
Simplify the expression using K-map and draw the logic diagram for the simplified expression using NAND agates, given Y (A, B, C, D) = Σm (1,4,5,7,12,14,15) + Σd(3,6,13)
Answer:
2nd PUC Electronics Model Question Paper 3 with Answers 14

2nd PUC Electronics Model Question Paper 3 with Answers

Part – E

Answer any Four questions. 4 x 5 = 20

Question 32.
With a circuit diagram explain the working of CB amplifier. Draw the input and output wave forms. Mention one application.
Answer:
2nd PUC Electronics Model Question Paper 3 with Answers 15

The weak signal to be amplified is applied to emitter-base junction and output signal is taken across collector-base junction.

The DC power supply, R1, R2, RE, Rc provide the required biasing for the transistor. Capacitor C1, C2 block dc and allow ac to pass through. Capacitor CB by passes ac to the ground. During positive half cycle of input signal, the forward bias between base-emitter junction decreases, as VBE is already negative with respect to the ground.

Hence iE and ic. decrease and ic Rc also decreases.
VCB =Vcc – ic R. As ic Rc decreases, VCBincreases. Hence we get amplified positive half cycle. During negative half cycle of the input signal, forward bias is increased because VBEis negative w.r.t. the ground.

Hence iC , iE are increased and ic Rc is increased. As VCB =Vcc – ic R when ic Rc increases, output voltage VCB decreases.

Thus, the positive going input signal produces positive going output signal and negative going input signal produces negative going output signal. Hence in CB amplifier, the input and output signals are in phase.

Question 33.
Explain FM transmitter with a block diagram.
Answer:
2nd PUC Electronics Model Question Paper 3 with Answers 16
The modulating signal is applied to the pre-emphasis circuit, which improves signal to noise ratio, AF amplifier amplifies output of pre-emphasis. The processed signal is fed to reactance modulator. The reactance modulator uses a transistor or FET connected across tank circuit of carrier oscillator.

The oscillator frequency depends on the tank reactance which in turn depends on the instantaneous amplitude of modulating signal. Thus, output of reactance modulator will be a frequency modulated wave.

The oscillator is followed by a buffer amplifier which isolates oscillator from subsequent stages. The limiter maintains the amplitude constant. Class C power amplifier amplifies modulated wave to required power levels. The FM signal is then fed to the transmitting antenna.

2nd PUC Electronics Model Question Paper 3 with Answers

Question 34.
With a sketch explain the two reansistor model of SCR. Derive an equation for anode
curent for zero gate current.
Answer:
2nd PUC Electronics Model Question Paper 3 with Answers 17
When gate terminal is open, IG = 0. Then J1, and J3 are forward biased and J2 is reverse biased
Then Ic11 IA + ICu1 — (1)
Ic22 IA + ICu2 — (2)
α12 are current gains of transistor Q1 and Q2
while ICu1 and ICu2 are reverse saturation currents.
We have IA = Ic1+ Ic2 — (3)
Equation (3) becomes,
IA = α1 IA + ICu1 + α2 Ik + Iω2 —-(4)
It = Ia + Ic = IA
Put Ik = IA .in equation (4),
IA = α1 IA + ICu1 + α2(IA +Ic ) +ICu2
Solving this equation,
\(I_{ A }=\frac { I_{ Cu1 }+I_{ Cu2 } }{ 1-\left( \alpha _{ 1 }+\alpha _{ 2 } \right) } +\frac { I_{ CO } }{ 1-\left( \infty _{ 1 }+\infty _{ 2 } \right) } \)
Where ICuo = ICu1+ ICu2

Question 35.
Explain the working of clocked RS flip-flop using NAND gates. Write its truth table and timing diagram.
Answer:
2nd PUC Electronics Model Question Paper 3 with Answers 18
It is constructed using inverters inserted into inputs of cross coupled NAND gates.
Working:

  1. When S=0, R=0, it does not respond and hence outputs Q and Q will remain in their previous state. This is called HOLD condition.
  2. When S=1 and R=0, the output Q and Q change to 1 and 0. This condition is called SET state.
  3. When S=0, R=1, the output Q and Q change to 0 and 1. This condition is called RESET state.
  4. When S=1 and R=l, it drives output Q and Q both to HIGH which is FORBIDDEN or INVALID condition.

2nd PUC Electronics Model Question Paper 3 with Answers 19

 

Question 36.
Write a program to add the values of locations 40H and 41H store the result in locations
50H and 51H.
Answer:
MOV     A, 40H
ADD       A, 41H
MOV      5 OH, A
MOV      51H, A.

Question 37.
Write the basic structure of C program and explain each section in brief.
Answer:
C program may contain one or more sections as shown in fig. 1.
Overview of a C program

Documentation Section
Link Section
Definition Section
Global declaration Section
main( ) Function Section
{
Declaration part
Executable part
}
Subprogram Section
Function 1
Function 2
Function 3
Function 4
…………………
(User-defined functions)
Function n

2nd PUC Electronics Model Question Paper 2 with Answers

Students can Download 2nd PUC Electronics Model Question Paper 2 with Answers, Karnataka 2nd PUC Electronics Model Question Papers with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.

Karnataka 2nd PUC Electronics Model Question Paper 2 with Answers

Max Marks: 70
Time : 3 hrs. 15min.

Part – A

Answer all questions: 10 x 1 = 10     

Question 1.
Define pinch-off voltage.
Answer:
Pinch off voltage is the gate voltage at which drain current becomes almost constant.

Question 2.
Define quiescent point.
Answer:
Q point is the zero signal values of collector current Ic and collector to emitter voltage VCE.

Question 3.
Name any one material which exhibits piezo electric effect.
Answer:
Quartz

2nd PUC Electronics Model Question Paper 2 with Answers

Question 4.
What s fading?
Answer:
Fading is the fluctuation in the strength of radip signal.

Question 5.
How many side bands are present in AM wave?
Answer:
Two side bands.

Question 6.
What is frequency modulation?
Answer:
Frequency modulation is varying the frequency of the carrier wave in accordance with the modulating signal.

Question 7.
Define a QUAD in a K-map.
Answer:
Quad is group of four adjacent l’s ink-map.

Question 8.
Convert 1111 to gray code.
Answer:
(1111 )2 = (1000) in Gray code

2nd PUC Electronics Model Question Paper 2 with Answers

Question 9.
What does a ‘jump’ instruction do in microcontroller programming?
Answer:
Jump permanently changes the contents of the program counter if centain program condition exists.

Question 10.
What is the value of 17% – 2 in C programming?
Answer:
1

Part -B

Answer any five questions. 5 x 2 = 10

Question 11.
What is a heat sink? Mention its use.
Answer:
Heat sink is a device which absorbs the unnecessary heat generated in the transistor and radiates it to surroundings and protects it.

Question 12.
Draw the frequency response of a CE amplifier.
Answer:
2nd PUC Electronics Model Question Paper 2 with Answers 1

Question 13.
Write any four characteristic features of voltage series negative feedback amplifier.
Answer:

  • Voltage gain decreases
  • Input impedance increases
  • Output impedance decreases
  • Bandwidth increases.

2nd PUC Electronics Model Question Paper 2 with Answers

Question 14.
Name the four different modes of a differential amplifier.
Answer:
Differential amplifier is a circuit which amplifies the difference of inputs applied to it.
2nd PUC Electronics Model Question Paper 2 with Answers 2

Dual input and balanced output differential Amplifier
2nd PUC Electronics Model Question Paper 2 with Answers 3

Single input and unbalanced output differncial amplifier
2nd PUC Electronics Model Question Paper 2 with Answers 4

Single input and balanced output differncial amplifier
2nd PUC Electronics Model Question Paper 2 with Answers 5

Dual input and unbalanced output differential Amplifier

2nd PUC Electronics Model Question Paper 2 with Answers

Question 15.
Distinguish between damped and undamped oscillations.
Answer:

  • Damped oscillations are electrical oscillations whose amplitude keeps on decreasing with time but frequency remains a constant.
  • Undamped oscillations are electrical oscillations whose amplitude remains constant with respect to time.

Question 16.
Mention different opcodes used in 8051.
Answer:
MOV, MOVX, MO VC, PUSH and POP, XCH

Question 17.
What is the use of main ( ) function in C?
Answer:
Main ( ) is a special function used by C system to tell the computer where the program starts.

Question 18.
Expand AMPS and TDMA.
Answer:
AMPS = Advanced mobile phone service
TDMA=Time Division Multiple Access.

Part – C

Answer any five questions. 5 x 3 = 15

Question 19.
Give a comparison between FET and BJT.
Answer:

FET BJT
It is a voltage controlled device. It is a current controlled device.
It is a unipolar device. It is a bipolar device.

2nd PUC Electronics Model Question Paper 2 with Answers

Question 20.
Draw the frequency response of an amplifier with and without feedback and comment
on the gainbandwidth product of the amplifier.
Answer:
2nd PUC Electronics Model Question Paper 2 with Answers 6

Question 21.
Explain in brief the ground wave propagation.
Answer:
Ground waves are the waves transmitted along or reflected from the surface of the earth. These can exist when the transmitting and receiving antennas are close to the surface of the earth.

The ground wave is vertically polarised and will transmit most effectively at a frequency less than 2 MHZ. The AM broad cast signals travel as ground waves. The strength of the ground wave is reduced due to energy absorption by the earth’s surface.

Question 22.
Show that the total power in an AM wave is 3/2 times the carrier power.
Answer:
2nd PUC Electronics Model Question Paper 2 with Answers 7

Question 23.
Explain the terms sensitivity, selectivity and fidelity with respect to a radio receiver.
Answer:

  • Sensitivity of a radio receiver is its ability to respond to weak signals.
  • Selectivity is the ability of a radio receiver to distinguish between desired signal to which the receiver is tuned and the other signal frequencies.
  • Fidelity of a radio receiver is its ability to reproduce faithfully in its output, the signal that appears at its input.

Question 24.
Explain briefly the working of non-punch through diode with its electric field profile
diagram.
Answer:
In non-punch through diodes, the depletion region boundary does not reach the end of drift layer. In punch through diode, the depletion layer spans the entire drift region and is in contact with n+ cathode.

2nd PUC Electronics Model Question Paper 2 with Answers

Question 25.
Write the classification of RADAR systems.
Answer:
1. Doppler wave (CW) Radar

  • Doppler radar
  • FM radar
  • phased array radar.
  • planar array radar.

2 Pulsed Radar.

  • Moving target indicator (MTI) radar
  • Radar beacons.

Question 26.
Draw the logic diagram of PISO register. Explain the SHIFT / \(\overline{L O A D} \) action in it.
Answer:
2nd PUC Electronics Model Question Paper 2 with Answers 8

Part – D

Answer any five questions. 3 x 5 = 15

Question 27.
Calculate the voltage gain, input impedance and output impedance of a CE amplifier with IE = 1.3 in mA, β = 100, Rc = 10kQ, RL = 10kΩ
Answer:
2nd PUC Electronics Model Question Paper 2 with Answers 9

Question 28.
Calculate the output voltage VQ.
2nd PUC Electronics Model Question Paper 2 with Answers 10
Answer:
2nd PUC Electronics Model Question Paper 2 with Answers 11
2nd PUC Electronics Model Question Paper 2 with Answers 12

2nd PUC Electronics Model Question Paper 2 with Answers

Question 29.
A Hartley oscillator circuit is to generate a frequency of 1200 kHz. If the capacitor in the feedback network has a value of 220 pF and one of the inductors value is 20 pH, calculate the value of the other inductor.
Answer:
2nd PUC Electronics Model Question Paper 2 with Answers 13

Question 30.
Simplify using K-map Y(A, B, C, D) = Em (2, 4, 5, 9,10, 12,14, 15) + Ed (0, 6, 8,13). Realize the simplified expression using NAND gates only.
Answer:
2nd PUC Electronics Model Question Paper 2 with Answers 14

Question 31.
Write a program to multiply two 8 bit numbers 06H and 09H at memory locations 40H and 41H respectively. Store the result at memory locations 42H (Lower Byte) and 43H (Higher Byte).
Answer:
Mov a,  40
Mov fo,  41
Mul a,  b
Mov 42,  a
Mov 43,  fo

Part – E

Answer any Four questions. 4 x 5 = 20  

Question 32.
Give a comparison of different power amplifiers.
Answer:

Class A B C AB
Conduction
angle
360° 180° Less than 90° 180° to 360°
Position of Q point Centre of load line. on x-axis (cut off) Below x-axis Between x-axis and centre of load line
Overall
efficiency
25% 70-80% Higher than 80% 50-70%
Signal
distortion
None At x-axis cross over point Large
Amounts
Small amounts.

2nd PUC Electronics Model Question Paper 2 with Answers

Question 33.
With a relevant diagram, derive an expression for the output voltage of an op-amp logarithmic amplifier.
Answer:
2nd PUC Electronics Model Question Paper 2 with Answers 15
2nd PUC Electronics Model Question Paper 2 with Answers 16
∴ The output voltage is proportional to natural logarithm of input voltage.

2nd PUC Electronics Model Question Paper 2 with Answers

Question 34.
Write the block diagram of digital communication and explain the function of each block.
Answer:
Source encoder: Converts analog signal into binary code
2nd PUC Electronics Model Question Paper 2 with Answers 17

  • Channel encoder: Generates channel code word from the source code words.
  • Modulator: Modulates the channel code words into a continuous wave.
  • Low pass filter: Allows only lower frequencies and blocks the other frequencies.
  • Synchronisation: Is required to demodulate a carrier modulated wave.
  • Demodulator: Converts continuous waveform into ordinary signal.
  • Channel decoder: Decodes the channel code word.
  • Source decoder: Converts channel decoder code word into information signal.

Question 35.
What is a full adder? Explain its working with respect to three input X – OR gate and basic gates with the help of truth table and Boolean expression.
Answer:
Full adder is a combinational logic circuit that performs arithmetic sum of three bits and gives their sum and carry .
2nd PUC Electronics Model Question Paper 2 with Answers 18

2nd PUC Electronics Model Question Paper 2 with Answers

Question 36.
With circuit diagram, explain the working of single phase SCR half wave rectifier with RC triggering.
Answer:
2nd PUC Electronics Model Question Paper 2 with Answers 19
The load is connected before RC circuit. In this circuit the capacitor voltage reduces, when SCR is conducting. Diode D2 along with D1 is used to prevent negative voltage to the gate w. r. t. the cathode. The firing angle for half wave rectifier is
\(\alpha=180-\left(\frac{x}{\frac{y}{2}}\right) \times 180\)

2nd PUC Electronics Model Question Paper 2 with Answers

Question 37.
What is a variable in C language? Mention the rules for constructing variable names in C.
Answer:

  • Variable name consists of Setters, digits & underscore (_)
  • Must begin with a letter. Some systems permit an underscore as the first character.
  • ANSI standard recognizes a length of 31 characters. However, the length should not be normally more than 8 characters, since only the first eight characters are treated significant by the compiler.
  • Uppercase and lowercase are significant, ie TOTAL is not same as total or
  • Variable name should not be a keyword.
  • White space is not allowed.

Example: Valid: temp, avg, suml ,total, ph value, T_raise, mark, i, j Invalid: 123,25th 5times, (area) abc$ char, int, group one abc-5

2nd PUC Electronics Model Question Paper 1 with Answers

Students can Download 2nd PUC Electronics Model Question Paper 1 with Answers, Karnataka 2nd PUC Electronics Model Question Papers with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.

Karnataka 2nd PUC Electronics Model Question Paper 1 with Answers

Max Marks: 70
Time : 3 hrs. 15min.

Part – A

Answer all questions: 10 x 1 = 10     

Question 1.
Expand the term FET.
Answer:
FET = Field Effect Transistor.

Question 2.
Which region of a transistor acts as a closed switch?.
Answer:
Saturation Region

Question 3.
Mention one application of a comparator.
Answer:
Zero crossing detector or Schmitt Trigger.

2nd PUC Electronics Model Question Paper 1 with Answers

Question 4.
What is over modulation in AM?
Answer:
If modulation index is greater than 1, then it is called over modulation in AM.

Question 5.
Mention the frequency range of FM super heterodyne receiver.
Answer:
88 to 108 MHz.

Question 6.
Name the power device used in controlled rectifier?
Answer:
Power diode

Question 7.
Write the BCD code for (23)10.
Answer:
(23)10 = (0010 0011)2

Question 8.
Which code is used in shaft position encoders?
Answer:
Gray code.

Question 9.
How many register banks are present in 8051?
Answer:
4

2nd PUC Electronics Model Question Paper 1 with Answers

Question 10.
What is the command to execute a program in UNIX system?
Answer:
sh.

Part-B

Answer any Five questions. 5 x 2 = 10

Question 11.
Name two types of JFET.
Answer:

  • n channel FET
  • p channel FET

Question 12.
Mention any two characteristics of a CC amplifier.
Answer:
High input impedance and low output impedance.

Question 13.
Mention the different types of negative feedback.
Answer:

  • Voltage shunt feedback
  • Voltage series feedback
  • Current series feedback
  • Current shunt feedback

2nd PUC Electronics Model Question Paper 1 with Answers

Question 14.
Draw the equivalent circuit of transmission lines for low frequency.
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 1

Question 15.
Give the reason for the presence of drift layer in a power diode.
Answer:
The drift layer decreases the resistivity of the power diode under forward biased condition.

Question 16.
Convert (1011)2 into gray code using XOR gates
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 2

Question 17.
Mention any two types of errors that occur in C programming.
Answer:
Syntax, errors, Logical errors, Run time errors.

Question 18.
Explain what is meant by cell splitting.
Answer:
Cell splitting is dividing entire geographical area into hexadecimal shaped cells that fit together to form honey comb pattern.

Part – C

Answer any Five questions. 5 x 3 = 15   

Question 19.
Derive the equations to determine the coordinates of Q point in voltage divider bias.
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 3

Voltage across R2 is
\(\mathrm{V}_{2}=\frac{\mathrm{V}_{C C} \mathrm{R}_{2}}{\mathrm{R}_{1}+\mathrm{R}_{2}}\)
Applying KVL to the base circuit , We get
V2 = VBE + V2
V= VBE + IE RE

2nd PUC Electronics Model Question Paper 1 with Answers 4
Equations 1 and 2 define operating point or Q point.

Question 20.
With a block diagram derive an expression of output impedance of negative feedback amplifier.
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 5
An amplifier should have a low output impedance so that it can deliver power to load without much loss. With negative feedback, the output impedance of the amplifier decreases which is desirable.

Let Zo be output impedance of basic amplifier and Zof be the output impedance with negative feedback. A hypothetical source of voltage Vo is applied at the output. By applying KVL to the output loop,

Vo = IoZo +AVi.
With negative feedback, input to basic amplifier with negative feedback is
Vi = Vs – Vf
V= o – Vf
V– Vf
{As input is short circuited, V = o}
2nd PUC Electronics Model Question Paper 1 with Answers 6
As 1+Aβ>1,output impedance of amplifier decreases by a factor(1+Aβ)

2nd PUC Electronics Model Question Paper 1 with Answers

Question 21.
With a circuit diagram explain the working of Wien bridge oscillator.
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 7
The circuit diagram shows wein bridge oscillator in which wein bridge is connected between amplifier input terminal and the output terminal. The bridge has a series RjC, network in one arm and a parallel R2C, network in the adjoining arm. In the remaining arm of the bridge, resistors R3, R4 are connected. The phase angle criterion for oscillation is that total phase shift around the circuit should be 0°.

This is possible only when output is fedback to the non­inverting input without any phase shift since the lead-lag network does not produce any phase shift. This condition occurs only when the bridge is balance i.e., at resonance. The frequency of oscillation is given by \(f=\frac{1}{2 \pi R C}=\frac{0.159}{R C}\)
The feedback fraction, β = \(\frac{1}{3}\)

Question 22.
Mention the different layers of Ionosphere and explain each layer.
Answer:
Ultraviolet radiation from the sun cause the upper atmosphere to ionize i.e. to become electrically charged. Hence a thick layer of ions formed at heights of 50 km to 400km. The ionosphere supports MF and HF wave propagation.
Its three layers are:

D layer: It is at a height of 70 km and has an average thickness of 10 km. It disappears in the night time. It reflects VLF and LF waves and absorbs MF and HF waves.

E layer: It is at a height of 100 km with a thickness of 25 km. This layer disappears at night. It helps in MF and HF wave propagation.

F layer: It is at a height of 150 km and extends upto 400 km. This layer exists during both day and night time. During day time, it splits into two layers F, and F2, and combines to form a single F layer during night time.

F2 region. 250-400 km.
F1 region. 160-250 km.
E region. 95-130 km
D region. 50-95 km.
Troposphere Earth.

2nd PUC Electronics Model Question Paper 1 with Answers

Question 23.
Draw the circuit diagram of single phase AC voltage controllers with input and output waveforms.
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 8
TRIAC is a bi-directional solid state device and conducts in both halves of ac supply. During positive half cycle MT2 becomes positive wrt MT, and gate becomes positive wrt MTr TRIAC conducts when gate pulse is injected at a firing angle a. The current follows TRIAC in the voltage wave shape from angle α to π At π, the zero crossing of the supply voltage, the TRIAC is switched OFF due to line commutation.

Question 24.
Determine anode current IA of SCR when Ic = 0. Given (α1 + α2) = 0.98 and
(1C01 + 1C02) = 1mA.
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 9

Question 25.
Write an assembly language program to add 05H and OAH and store the result in R2.
Answer:
MOV A, #05H ; load 05H into A.
ADD A,# OAH ; add OA to 05H.
MOVR2,A ; A = A + 05H.
NOP; load A to R5
END.

Question 26.
Mention few application of satellites.
Answer:

  1. Voice communication.
  2. TV and radio broadcast.
  3. Teleconferencing.
  4. Mobile communication.

Part – D

Answer any Three questions:  3 x 5 = 15

Question 27.
Calculate the voltage gain, input impedance and output impedance in the circuit given below. Given β = 100 and \(r_{ e }=\frac { 26mv }{ { I }_{ { E } } } \)
2nd PUC Electronics Model Question Paper 1 with Answers 10
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 11

2nd PUC Electronics Model Question Paper 1 with Answers

Question 28.
Design an adder using an op-amp to get the output expression as
Vo = (4V1+ 2V2 – 5V3) where Rf = 10 kΩ.
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 12

Question 29.
A colpitts oscillator oscillates at 1.13MHz. If the inductor in the feedback network has a value of 20pH and one of the capacitor values is 0.1pF, calculate the value of the other capacitor.
Answer:
f= 1.13 MHz = 1.13 x 106 Hz
L = 20 μH = 20 x 10-6 H
C1 = 0.1 μH = 0.1 x 10-6 H
2nd PUC Electronics Model Question Paper 1 with Answers 13

Question 30.
A 10 kW carrier wave is amplitude modulated at 80% depth of modulation by a sinusoidal modulating signal. Calculate the total power and sideband power of the AM wave.
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 14

Question 31.
Simplify the Boolean expression Y=Σm (0,2, 4,8,10) + ∑d (11,12,13,14) using K- map. Draw the NAND Gate equivalent circuit to realize the simplified equation.
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 14

Part – E

Answer any Four questions. 4 x 5 = 20

Question 32.
With a circuit diagram explain the working of class B push pull amplifier.
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 16
Class B push-pull amplifier is as shown in the diagram. T1 and T2 are two centre tapped transformers and Q1, Q2 are two identical transistors. Transformer T1 produces signal voltages V1 and V2 which are 180° out of phase with each other.

These two signals are applied to the Polarities reverse during negative half cycle of input voltage. Q2then is ON and Q1 is OFF. Q2amplifies the signal and the alternate half cycle appears across the loud speaker.

2nd PUC Electronics Model Question Paper 1 with Answers

two transistors. Transformer T2 couples AC output signal from collector to loud speaker. The two emitters are connected to centre tap of transformer T1 secondary and Vcc to the centre tap of T2 secondary.

During positive half cycle of input voltage, secondary winding of T1 has voltages V, and V2. Transistor Q1, conducts and Q2 is cut off. The collector current through Q1 produces an amplified and inverted voltage which applied to loud speaker through a transformer.

Question 33.
(a) Explain how an operational amplifier can be uses as an integrator?(1 + 4)
Answer:
2nd PUC Electronics Model Question Paper 1 with Answers 17
Integrator is a circuit whose output is proportional to integral of its input.

(b) Mention any four characteristic of ideal OP – Amp.
Answer:

Characteristics Ideal op amp Practical op – amp
open loop gain 105
Input impedance Few M Q.
Output impedance 0 Few ohm.
Bandwidth Few MHz.
CMRR 90 dB

Question 34.
Draw the block diagram of AM SHD receiver and explain the function of each block.
Answer:
RF amplifier: The RF amplifier increases the signal strength before the signal is fed to mixer
2nd PUC Electronics Model Question Paper 1 with Answers 18

when turned to the desired frequency. The RF amplifier is designed to handle large bandwidth of 150 kHz.

Mixer: the incoming RF signal of frequency fm is applied to a mixer which also receives the output from the local oscillator. A new frequency called intermediate frequency IF is produced whose value is difference of local oscillator signal f and signal frequency f.

Local oscillator: the receiver converts incoming carrier frequency to the IF by using local oscillator frequency higher than incoming tuned frequency. Colpitts oscillator is used as the local oscillator.

IF amplifier: IF signal is amplified by one or more number of amplifiers, which raises the strength of IF signal. It has multistage class A amplifier providing better selectivity and gain.

Limiter: It removes all the amplitude variation in FM signal caused by noise. Differential amplifiers are preferred for limiter.

Discriminator: It recovers the modulating signal from the IF signal. It converts frequency variation into corresponding voltage variation and produces the modulating signal. De-emphasis network: It reduces the relative amplitude of high frequency signals that are boosted in the transmitter and brings them back to their original level.

AF amplifier: It amplifier the modulating signal recovered by the FM detector. The speaker converts the electrical signal into sound signal.

2nd PUC Electronics Model Question Paper 1 with Answers

Question 35.
Explain the working of JK flip – flop with logic circuit. Draw its timing diagram and write its truth table.
2nd PUC Electronics Model Question Paper 1 with Answers 19
Answer:

  1. When J = 0, K= 0, the S and R inputs are both at 0 and hence the output is in the HOLD state.
  2. When J = 0, K = 1, S input is at 0 while R can be either at 0 or 1, but output is always in the RESET state.
  3. When J = 1, K = 0, S input can be 0 or 1 but R input is always at logic 0 and hence the output remains at a stable SET state.
  4. When J = 1, K = 1 the Flip flop goes to complementary’ state of previous output i.e, flip flop toggles

2nd PUC Electronics Model Question Paper 1 with Answers 19

 

Question 36.
(a) Why 8051 microcontroller is known as 8 bit processor?
Answer:
8051 is called 8 bit processor because most of the operations are limited to 8 bits.

(b) Name the addressing modes of the following instruction.
MOV A, R0
MOV Ro, 40H
MOV A, @R0
Answer:
(i) Register addressing mode.
(ii) Direct addresssing mode.
(iii) Indirect addressing mode.

Question 37.
(a) Write a C program to accept the three integers and print the largest amongst them.=
Answer:
# include < stdio.h>
void main ( )
{
int x,y,z;
print f (” Enter the values of x, y, z\ n”);
scan f (” %d %d %d”, & x, &y, &z);
if (x > y)
if (x > z)
print/(‘x is largest /n”);
else
Print f (“z is largest/»”);
else if (y> z)
print f (“y is largest / rt” 0:
else
print f (” z is largest W);
}
/* End ofprogram * /

2nd PUC Electronics Model Question Paper 1 with Answers

(b) Mention any four operators used in C programming.
Answer:

  • Arithmetic operators.
  • Relational operators.
  • Assignment operators.
  • Conditional operators.

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Students can Download 2nd PUC Electronics Chapter 10 Digital Electronics Questions and Answers, Notes Pdf, 2nd PUC Electronics Question Bank with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.

Karnataka 2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

2nd PUC Electronics Digital Electronics One Mark Questions and Answers

Question 1.
What is an XOR gate?
Answer:
The logic gate whose output is high only when odd number of inputs are high is known as an XOR gate

Question 2.
Draw the symbol of XOR gate?
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 1

Question 3.
Write the Boolean equation of XOR gate
Answer:
\(\mathrm{Y}=\mathrm{A} \overline{\mathrm{B}}+\overline{\mathrm{A}} \mathrm{B}=\mathrm{A} \oplus \mathrm{B}\)

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 4.
Draw the symbol of XOR gate.
Answer:

Input Output
A B Y= A ⊕ B
0 0 0
0 1 1
1 0 1
1 1 0

Question 5.
Draw the symbol of XNOR gate.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 2

Question 6.
Write the Boolean expression for the XNOR gate.
Answer:
\(\mathrm{Y}=\mathrm{AB}+\overline{\mathrm{A}} \overline{\mathrm{B}} =\overline{\mathrm{A} \oplus \mathrm{B}}\)

Question 7.
Write the truth table of XNOR gate
Answer:

Inputs Output
A B \(\mathrm{Y}=\overline{\mathrm{A} \oplus \mathrm{B}}\)
0 0 1
0 1 0
1 0 0
1 1 1

Question 8.
Name the universal gates.
Answer:
NAND gate and NOR gate.

Question 9.
How many two input NAND gates are required to produce two input OR function?
Answer:
Three.

Question 10.
How many two input NOR gates must be used to produce two input OR function?
Answer:
Two.

Question 11.
Why do we use digital codes?
Answer:
Digital codes are used to represent analog information.

Question 12.
What is BCD code?
Answer:
BCD is a numeric code in which each digit of a decimal number is represented by a four bit binary number.

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 13.
What is a gray code?
Answer:
Gray code is a non-weighted code which is used in analog to digital conversion.

Question 14.
Which are weighted codes?
Answer:
8421 code, 2421 code.

Question 15.
Which are non-weighted codes?
Answer:
Excess-3 code, Gray code.

Question 16.
Name the self complementing code.
Answer:
Excess-3 code.

Question 17.
Convert 11012 into gray code.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 3

Question 18.
Name the alpha numeric codes.
Answer:
ASCII code, EBCDIC code.

Question 19.
Expand ASCII.
Answer:
American Standard code for Information Interchange.

Question 20.
Expand EBCDIC.
Answer:
Extended Binary Coded Decimal Interchange Code.

Question 21.
How many zone bits are there in EBCDIC?
Answer:
4

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 22.
What is a half-adder?
Answer:
Half adder is a logic circuit which adds two bits and gives to outputs sum and carry.

Question 23.
What is a full adder?
Answer:
Full adder is a combinational logic circuit that performs arithmetic sum of three input bits and gives as output sum and carry.

Question 24.
What is a half subtractor?
Answer:
Half subtractor is a combinational logic circuit which performs the subtraction of two bits and gives difference and borrow.

Question 25.
Draw the block diagram of half adder.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 4

Question 26.
Draw the block diagram of full adder.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 5

Question 27.
Draw the block diagram of half subtractor
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 6

Question 28.
Write the Boolean expression for sum of half adder.
Answer:
\(A \oplus B=A \bar{B}+\bar{A} B\)

Question 29.
Write the Boolean expression for sum of full adder.
Answer:
A ⊕ B ⊕ Cin.

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 30.
Write the Boolean expression for the carry of half adder.
Answer:
AB.

Question 31.
Write the Boolean expression for the carry of full adder.
Answer:
Co = AB + BCin + Cin A.

Question 32.
Write the Boolean expression for difference of half subtractor.
Answer:
A ⊕ B

Question 33.
Write the Boolean expression for borrow of half subtractor.
Answer:
\(\overline{\mathrm{A}} \mathrm{B}\)

Question 34.
Define min term.
Answer:
Min term is a special case product (AND) term containing all the input variables that make up a Boolean expression.

Question 35.
Define max term.
Answer:
Max term is a special case sum (OR) term containing all the input variables that make up a Boolean expression.

Question 36.
Define SOP.
Answer:
The Boolean expression containing all input variables in each of product term either in complemented or uncomplemented form is known as canonical sum of products expression.

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 37.
Define POS.
Answer:
The Boolean expression containing all the input variables either in complemented or uncomplemented form in each of sum term is known as canonical POS expression.

Question 38.
What is canonical SOP equation?
Answer:
It is an equation containing all input variables in each of product term either in complemented or uncomplemented form.

Question 39.
What is canonical POS equation?
Answer:
It is an equation containing all input variables either in complemented or uncomplemented form in each of sum term.

Question 40.
What is a Karnaugh map?
Answer:
Karnaugh map is a graphical method of simplification of Boolean expression.

Question 41.
What is meant by looping?
Answer:
Looping is encircling of two adjacent 1 s on a K map.

Question 42.
What is a cell in K map?
Answer:
A cell in a K map is a box which represents a particular combination of variables in its product form.

Question 43.
What is meant by redundant group?
Answer:
A redundant group is a group in which all the 1 s in a group are over lapped by other groups.

Question 44.
What is a pair?
Answer:
A group of adjacent 1 either horizontally or vertically but not diagonally on a K map is called a pair.

Question 45.
What is a quad?
Answer:
Quad is a group of four adjacent 1 s in a K-map.

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 46.
What is an octet?
Answer:
An octet is a group of eight adjacent Is either in two rows or two columns in a K map.

Question 47.
How many variables does the pair eliminate?
Answer:
One variable.

Question 48.
How many variables does the quad eliminate?
Answer:
Two variables.

Question 49.
How many variables does the octet eliminate?
Answer:
Three variables.

Question 50.
What is a don’t care condition?
Answer:
An output condition that may be either 1 or 0 without affecting the operation of the system is called don’t care condition.

Question 51.
Name the universal gate used to realize AND-OR logic.
Answer:
NAND gate.

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 52.
Name the universal gate used to realize OR-AND logic.
Answer:
NOR gate

Question 53.
What is a sequential logic circuit?
Answer:
Sequential logic circuits are those circuits whose output level depends on present levels of input and previous input levels.

Question 54.
What is a flip flop?
Answer:
A flip flop is a bistable multivibrator which has two stable states. It is a basic memory element which can store one bit information.

Question 55.
Is the flip flop a bistable device?
Answer:
Yes Flip flop is a bistable device.

Question 56.
Define a clock pulse.
Answer:
A clock is a periodic train of pulses or square waves which acts as a control signal. The output changes state only when clock makes transition.

Question 57.
Draw the logic circuit of an unclocked SR flip flop.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 7

Question 58
Draw the logic diagram of a D flip flop.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 8

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 59.
Draw the logic diagram of a JK flip flop.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 9

Question 60.
Draw the logic diagram of T nip flop.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 10

Question 61.
What is a register?
Answer:
A register is a set of flip flops used to store binary data.

Question 62.
Which is the line used to transfer data in and out of a PISO shift register?
Answer:
The SHIFT LOAD line.

Question 63.
What is a counter?
Answer:

2nd PUC Electronics Digital Electronics Two Marks Questions and Answers

Question 1.
What is an XOR gate? Write its truth table.
Answer:
XOR gate is a logic gate whose output is HIGH only when odd number of inputs are HIGH.

Input Output
A B Y = A + B
0 0 1
0 1 0
1 0 0
1 1 1

Question 2.
What is an XNOR gate? Write its truth table.
Answer:
XNOR gate is a logic circuit whose output is HIGH only the inputs are same

Input Output
A B Y = A + B
0 0 1
0 1 0
1 0 0
1 1 1

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 3.
Draw the pin diagram of IC 7400.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 11

Question 4.
Draw the pin diagram of IC 7402.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 12
Question 5.
Explain the term universal gates.
Answer:
NAND gate and NOR gate are called universal gates because all the logic gates can be realised using these gates.

Question 6.
Realise XNOR gate using only NOR gates.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 13

Question 7.
What is the most important characteristic of gray code? Explain.
Answer:
Gray code changes only by one bit, each time the decimal number is incremented.

Decimal digit BCD Gray
0 0000 0000
1 0001 0001
2 0010 0011
3 0011 0010
4 0100 0110
5 0101 0111

Question 8.
Distinguish between excess-3 code and BCD code
Answer:
Excess-3 code is a non-weighted self complementing code. It is obtained by adding 3 to each digit in decimal number. BCD code is a weighted code. Each decimal number is represented by a separate group of four bits.

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 9.
Convert gray code 1000 into binary using XOR
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 14

Question 10.
Distingish between half adder and full adder.
Answer:
Full adder is combinational circuit which adds three bits and gives sum and carry. Half adder adds two bits and gives sum and carry.

Question 11.
Write the truth table and draw the timing diagram of a half adder.
Answer:

Inputs Outputs
A B Sum Y = A⊕B Carry Y = AB
0 0 0 0
0 1 1 0
1 0 1 0
1 1 0 1

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 15

Question 12.
Write the truth table and draw the timing diagram of a full adder.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 16
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 17

Question 13.
Realise the full adder using two half adders and a OR gate
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 18

Question 14.
Distinguish between SOP and POS equations.
Answer:
SOP equation is equation containing all the input variables in each of product term either in complemented or uncomplemented form.

POS equation is the equation containing all the input variables either in complemented or uncomplemented form in each of sum term.

Question 15.
Convert \({ AB }+\overline { { C } } \) into canonical SOP.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 19

Question 16.
Convert \((\mathbf{A}+\mathbf{C})(\mathbf{B}+\overline{\mathbf{C}})\) into canonical POS
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 20

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 17.
Distinguish between min term and max term.
Answer:
A max term is a special case sum term containing all input variables that make up a Boolean expression. A min term is a special case product term containing all input variable that make up a Boolean expression.

Question 18.
Write the truth tables for 3 variable input with min term designations.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 21

Question 19.
Explain the necessity of elimination redundant groups in a K-map.
Answer:
A redundant group is a group in which all the 1 s in a group are overlapped by other groups. Redundent group should be eliminated before writing simplified Boolean equation using k map. The elimination of redundant groups results in a simple logic circuit.

Question 20.
Explain don’t care condition.
Answer:
An output condition that may be treated as either 1 or 0 without affecting the operation is called don’t care condition.

When simplifying a logic expression using a K-map, a don’t care condition can be treated as a 1 if it contributes to the simplification and can be treated as 0 if it does not contribute to the simplification.

Question 21.
Distinguish between AND-OR logic and OR-AND logic.
Answer:

AND OR logic OR-AND logic
1. It is used in simlifying SOP expression. 1. It is used in simplifying POS expression.
2. It is realised only using NAND gates. 2. It is realised only using NOR gates.

Question 22.
Draw the 4 variable K-map with min term designations
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 22

Question 23.
Write the truth table for the expression \(\mathbf{Y}=\mathbf{A} \overline{\mathbf{B}}+\overline{\mathbf{A}} \mathbf{B}\)
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 23

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 24.
Draw the AND-OR logic circuit for the expression \(\mathbf{Y}=\overline{\mathbf{A}} \mathbf{B}+\overline{\mathbf{B}}\)
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 24

Question 25.
Draw the logic circuit for the expression  \(\mathbf{Y}=\mathbf{A} \mathbf{C}+\overline{\mathbf{C}}\) using only basic gates.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 25

Question 26.
Draw the logic circuit for the expression \(\mathbf{Y}=\mathbf{A} \mathbf{B}+\overline{\mathbf{B}}\) using only NAND gates
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 26

Question 27.
Distinguish between combinational and sequential logic circuits.
Answer:
Combinational logic circuits are circuits whose output level at any instant of time is dependent only on present levels of inputs at that time. These circuits do not have memory.

Sequential logic circuits are those circuits whose output levels at any instant of time depend not only on the present input state but also on previous input states. These circuits have memory.

Question 28.
Distinguish between SR and JK flip flop.
Answer:

  SR Flip Flop JK Flip Flop
1. When S = R = 1, it is in forbidden state. 1.When J=-K= 1, it toggles.
2. It can not be used for any application. 2. It can be used in most of applications.

Question 29.
What is race around condition? How is it etiminated?
Answer:
Toggling of the output more than once during the same clock pulse is called race around condition. It can be eliminated using an RC network (edge triggering) at the clock input or by using Master-slave JK flip flop.

Question 30.
Mention the types of shift registers.
Answer:

  • Serial-in, serial-out.
  • Serial-in, parallel-out
  • Parallel-in, serial-out.
  • Parallel-in, parallel-out.

Question 31.
Draw the logic diagram of SISO shift register.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 27

Question 32.
Draw the logic diagram of SIPO shift registor
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 28

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 33.
Draw the logic diagram of PISO shift register.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 29

Question 34.
Draw the logic diagram PIPO shift register
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 30

Question 35.
Mention a broad classification of counters.
Answer:
Counters are classified as synchronous counters and asynchronous counters.

2nd PUC Electronics Digital Electronics Three Marks Questions and Answers

Question 1.
What is an XOR gate? Realise logic expression Y=A⊕B⊕C using 2 input two XOR gates.
Answer:
XOR gate is a logic circuit whose output is HIGH only when odd number of inputs are HIGH.
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 31

Question 2.
Construct an XOR gate Using only NAND gates and write the Boolean expression at the output of each gate.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 32

Question 3.
Write the table of 2-4-2-1 code and show that it is a self complementing code
Answer:

Decimal Digit 2-4-2-1 Code
0 0000
1 0001
2 0010
3 0011
4 0100
5 0101
6 0.100
7 1101
8 1110
9 1111

1’s complement of 1100(610) = 0011 = 310
= 9’s complement of 6
∴ 2421 code is self complementing code

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 4.
Write ASCII codes for decimal numbers 0 and 9
Answer:

Decimal Number ASCIlCode
0 48
1 49
2 50
3 51
4 52
5 53
6 54
7 55
8 56
9 57

Question 5.
Draw logic symbol, timing diagram and truth table of
(i) Half adder
(ii) Half subtractor.
Answer:
(i) Half adder
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 33

Inputs Sum  Carry
A B Y = A +B Y = AB
0 0 0 0
0 1 1 0
1 0 1 0
1 1 0 1

(ii) Half subtractor.
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 34

Inputs Outputs
A B Difference Borrow
0 0 0 0
0 1 1 1
1 0 1 0
1 1 0 0

Question 6.
Realise the half adder using only NAND gates and write the Boolean expression at the output of each gate.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 35

Question 7.
Write the truth table and draw the timing diagram of full adder.
Answer:

Inputs Outputs
A B Sum Y = A + B Carry Y = AB
0 0 0 0
0 1 1 0
1 0 1 0
1 1 0 1

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 36

Question 8.
Realise full adder using two XOR, two AND gates and an OR gate.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 37

Question 9.
Write A+BC+AB into its canonical SOP and write the expression in min term designation.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 38

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 10.
Simplify the Boolean expression Y=∑m(0,2,4,6,8,10,ll,12,14,15) +∑d(9,13) using k-map.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 39

Question 11.
List the different types of flip flops.
Answer:

  • SR flip flop
  • D flip flop
  • JKflip flop
  • Master-Slave JK flip flop.

Question 12.
Draw the logic symbol, truth table and timing diagram of D flip flop.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 40

Question 13.
Draw the logic symbol, truth table and timing diagram of T flip flop
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 41
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 42

Question 14.
Mention few applications of flip flops.
Answer:

  • Transfer and storage of data.
  • Frequency division.
  • Counters
  • Detection of input sequence of data.

Question 15.
Write truth table, timing diagram and logic diagram of SISO register.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 43

Question 16.
Draw the logic diagram and counting sequence of a four bit synchronous up counter.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 44
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 45

2nd PUC Electronics Digital Electronics Five Marks Questions and Answers

Question 1.
Explain the universal property of NAND gate and realize AND, OR, NOT and XOR gates with their respective truth tables.
Answer:
NAND is called universal gate because other logic gates can be realised using NAND gates.
(1) AND gate from NAND gates:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 46

Inputs Output
A B Y = AB
0 0 0
0 1 0
1 0 0
1 1 1

(2) OR gate from NAND gates:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 47

Inputs Output
A B Y =A+B
0 0 0
0 1 1
1 0 1
1 1 1

(3) NOT gate from NAND gate:
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 48

Inputs Output
A \(\overline{\mathbf{A}}\)
0 1
1 0

(4) XOR gate from NAND gates:
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 49

Inputs Output
A  B Y
0 0 0
0 1 1
1 0 1
1 1 0

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 2.
What is a half subtractor? Explain its working with a truth table, logic diagram and timing diagram.
Answer:
Half subtractor is a logic circuit which subtracts two bits and gives difference and borrow.
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 50
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 51

Inputs Output
A B Difference Borrow
0 0 0 0
0 1 1 1
1 0 1 0
1 1 0 0

Question 3.
What is full adder? Explain its working with respect to three input XOR gate and basic gates with the help of truth table and Boolean expression.
Answer:
Full adder is a combinational logic circuit that performs arithmetic sum of three bits and gives their sum and carry.
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 52

Question 4.
Simplify the Boolean expression Y=Em(0,4,5,7) using k-map. Realise simplified expression by using both AND-OR logic and NAND-NAND gates.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 53

Question 5.
Convert \(Y\quad =\bar { AB } +BC+\bar { BD } \) into its canonical SOP form and write the truth table for the corresponding min term designation.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 54

Question 6.
With a logic circuit, explain working of un-clocked SR flip flop built using NAND gates. Draw its timing diagram and truth table.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 55
It is constructed using inverters inserted into inputs of cross coupled NAND gates.
Working:

  1. When S=0, R=0, it does not respond and hence outputs Q and Q will remain in their previous state. This is called HOLD condition.
  2. When S=1 and R=0, the output Q and Q change to 1 and 0. This condition is called SET state.
  3. When S=0, R=1, the output Q and Q change to 0 and 1. This condition is called RESET state.
  4. When S=1 and R=l, it drives output Q and Q both to HIGH which is FORBIDDEN or INVALID condition.

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 56

 

Question 7.
Explain the working of clocked Jk flip flop with its logic diagram ,truth table and timing
Answer:

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 57

  1. When J = 0, K= 0, the S and R inputs are both at 0 and hence the output is in the HOLD state.
  2. When J = 0, K = 1, S input is at 0 while R can be either at 0 or 1, but output is always in the RESET state.
  3. When J = 1, K = 0, S input can be 0 or 1 but R input is always at logic 0 and hence the output remains at a stable SET state.
  4. When J = 1, K = 1 the Flip flop goes to complementary’ state of previous output i.e, flip flop toggles

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 58

 

 

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics

Question 8.
Explain the working of SISO shift register with relevant diagrams.
Answer:

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 59

With four SR flip flops it can store upto 4 bits of data. Serial data is applied to S input of the first flip flop.

When serial data is transferred into the register, each new bit is clocked into first flip flop at the positive edge of each clock pulse. The bit that was stored by first flip flop is transferred to second flip flop and so on.

The shifting out of stored data 0101 serially from the register requires four clock pulses, which is represented as in the following truth table.

Question 9.
Explain the working of a four bit synchronous up counter using relevant diagrams.
Answer:
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 60
Counter is a logic circuit used for counting the pulses. It is a set of flip flops whose state changes in response to pulses applied to their inputs.

Counters are of two types:

  • Synchronous counters and
  • Asynchronous counters.

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 61
In a synchronous circuit, the clock signal is applied to all flip flops simultaneously.

Question 10.
Simplify the Boolean equation Y=∑m(0,2,4,8,10) +∑d(12,14) using K-map. Draw the NAND gate equivalent circuit to realise simplified equation.
Answer:
∑m(0,2,4,8,10) +∑d(12,14)

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 62

Question 11.
Simplify the Boolean equation Y= ∑m(4,5,7,9,11,12,13,15) +∑d(1,3,8) using k-map. Draw the NAND gate equialent circuit to realise the simplified equation.
Answer:
Y=∑d_(4,5,7,9,11,12,13,15) +∑d (1,3,8)
\(Y=B \bar{C}+D\)

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 63

Question 12.
Simplify Boolean equation Y=∑d (0,2,6,8,10,12,14) +∑d (4,9,13) using K map. Draw the NAND gate equivalent circuit to realise simplified equation.
Answer:
Y=∑d (0,2,6,8,10,12,14) +∑d (4,9,13)

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 64
2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 65
NAND gate equivalent circuit.

Question 13.
Simplify Boolean equation Y=∑d (1,3,5,6,8,9,11,12) +∑d (,0,7,1) K map.
Answer:

2nd PUC Electronics Question Bank Chapter 10 Digital Electronics 66

2nd PUC Electronics Question Bank Chapter 12 C Programming

Students can Download 2nd PUC Electronics Chapter 12 C Programming Questions and Answers, Notes Pdf, 2nd PUC Electronics Question Bank with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.

Karnataka 2nd PUC Electronics Question Bank Chapter 12 C Programming

2nd PUC Electronics C Programming One Mark Questions and Answers

Question 1.
What is C programming language?
Answer:
C is a powerful, flexible, portable and structured programming language.

Question 2.
Why is C programming language suitable for both systems and applications programming?
Answer:
C programming combines the features of high level language with the elements of assembler, hence it is suitable for both systems and applications programming.

Question 3.
What is a Function?
Answer:
A Function is a subroutine that may include one or more statements designed to perform a specific task.

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 4.
What is a C pre-processor?
Answer:
C pre-processor is a program that processes the source code before it passes through the compiler.

Question 5.
What is debugging a C program?
Answer:
The process of detecting and correcting errors in the program is debugging.

Question 6.
What is a syntax error?
Answer:
The syntax errors are due to the violation of syntax (grammar rules of programming languge).

Question 7.
What is a logical error?
Answer:
Logical errors occur during the coding process, when the type of the data is wrongly selected and is used for computation. [ int a,b,sum; printf(“\n enter the two numbers”); scanf(“%d%d ”,&a,&b);sum=a+b;printf(“\nsum is%d”,b);]

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 8.
What is run time error?
Answer:
Run time errors occur when the user tries to run ambiguous instriictions.
(like infinite loop, divided by 0 etc)

Question 9.
What is testing a program?
Answer:
The process of executing the program to test the correctness of the results is testing.

Question 10.
Where does the program be executed in a Computer?
Answer:
Program is executed in the central processing unit(CPU).

Question 11.
What are C tokens?
Answer:
The basic and smallest units of a C program are C tokens.(keywords, constants, operators etc)

Question 12.
What are constants?
Answer:
The quantity which does not change during the execution of a program is a constant.

Question 13.
Write the syntax for assigning values to variables.
Answer:
The syntax for assigning value to a variable is variable_name = value; (a=5;)

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 14.
Write the range of values for a keyword int.
Answer:
Range for int is from (-2-16) to (216-1) i.e. -32768 to 32767

Question 15.
Write the ASCII value for the character constant”=”.
Answer:
ASCII value of“=” is 061

Question 16.
What is a statement?
Answer:
Statement is an instruction to a computer to perform a specific operation.

Question 17.
Write the arithmetic operator used to represent remainder obtained in integer division.
Answer:
% (modulus) operator is used to represent the remainder obtained in integer division.

Question 18.
What is an operator?
Answer:
Operator is a symbol that tells the computer to perform certain arithmetic or logical operations.

Question 19.
What is the value of 17%-2?
Answer:
The value of 17%-2 is +1

Question 20.
What is a relational operator?
Answer:
Relational operator is used to compare two operands in an expression.

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 21.
What is the meaning of the symbol”~”?
Answer:
is 1 ’s complement operator.

Question 22.
Write the symbol of exclusive-OR operation.
Answer:
Symbol for Exclusive -OR operation is “Λ”(caret).

Question 23.
If A = 1, and B=0, what is the value of A Λ B?
Answer:
1 Λ 0 = 1 (1 XOR 0 = 1).

Question 24.
What is the difference between “=” and “= =”?
Answer:
“=” is an assignment operator whereas “= =” is an arithmetic operator.

Question  25.
What is the description of the following operator “Λ=”?
Answer:
Λ=” represents bitwise XOR assignment operator. ( c=c Λ b or c Λ =b;)

Question 26.
Where is a conditional operator used?
Answer:
Conditional operator is used to test the relation between two variables.

Question 27.
How do you represent increment operator?
Answer:
a++ or ++a.

Question 28.
What does the following sign represent?
Answer:
‘- -‘ represent decrement operator.

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 29.
How will the number x=:286 displayed on the monitor?
Answer:
If the statement is printf(“% d”,x); then it displays 998, instead if the statement is printf(“% f’,x); then it displays 9.98286e02.

Question 30.
How does the character output displayed if the character is Pre-University statement is print f(“%16”, book);
Answer:
Since the syntax of printing string is not specified it displays only 16 blank boxes as below.
2nd PUC Electronics Question Bank Chapter 12 C Programming 1

Question 31.
Write the syntax for continue statement.
Answer:
The syntax for continue statement is
—————
—————
continue;
—————

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 32.
What is an array?
Answer:
Array is an ordered list of similar data elements.

Question 33.
What is C function?
Answer:
C function is a set of instructions to carry out a particular task. (sqrt(), sin(), pow()).

Question 34.
What is the use of a function conio.h?
Answer:
“conio.h” is a C header file used mostly by MS-DOS compilers to provide console input/ output.

2nd PUC Electronics C Programming Two Marks Questions and Answers

Question 1.
Write the commonly used directive.
Answer:
# include<stdio.h> and #define pi 3.1415.

Question 2.
What does #include directive specify?
Answer:
#include directive specifies an external file containing functions or macro definitions which can be included as a part of a program.
#include<stdio.h> includes standard function to perform input and output operations.

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 3.
Briefly explain #define directive.
Answer:
#define directive is a compiler directive and not a statement. If this statement is included in the -program at the beginning, then the pre-processor replaces every occurrence of the identifier in the source code by the constant/string. For example if the statement is #define rate 20 then in the program whenever variable rate is considered then it is always assigned with constant 20.

Question 4.
Briefly explain #include directive.
Answer:
#include directive specifies an external file containing functions or macro definitions which can be included as a part of a program.
#include<stdio.h> includes standard function to perform input and output operations.

Question 5.
Write the steps involved in executing a C program.
Answer:
Steps involved in executing a C program are

  • creating a program
  • compiling the program
  • linking the program with functions needed from C library and finally
  • executing the program.

Question 6.
What are the different types of errors a programmer do?
Answer:
Generally, programmers do three types of errors namely syntax error, logical error and run time error.

Question 7.
Briefly explain syntax error.
Answer:
Syntax error is the result of violating the grammar of C programming language. When these errors occur, computer display an error message specifying the line number where the error has occurred. In the program segment
int a,b,c
a=20, b=c; computer will indicate semicolon is missing.

Question 8.
Briefly explain logical error.
Answer:
As the name implies Logical errors are related to the logic of the program execution. Logical errors do not show compiler generated error messages rather they cause wrong results. These errors are primarily due to poor understanding the problem, incorrect translation of the algorithm into program and lack of clarity of hierarchy of operators. In the statement if(x= =y) printf(“They are equal\n”); when x and y are float type, they rarely become equal due to truncation errors. The printf may not be executed at all. Similarly test condition while(x!=y) might create an infinite loop.

Question 9.
Briefly explain run time error.
Answer:
When the user tries to run ambiguous instructions run time error occurs. Errors of mismatching the data types, referencing out of range array element cannot be detected by the compiler. Divide by zero, data overflow are some examples.

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 10.
Mention the steps involved in running the program.
Answer:
The steps to run the program are

  • understand the instructions
  • store data and instructions and
  • perform computations.

Question 11.
For what purpose character sets are used?
Answer:
Character sets are used to form words, numbers and expressions.

Question 12.
Write any four character sets of C.
Answer:
The character sets of C are letters, digits, special characters and white spaces.

Question 13.
Mention the different C tokens.
Answer:
Keywords, identifiers, constants, strings, operators and special symbols are the different C tokens.

Question 14.
What is a floating constant? Give an example.
Answer:
Floating constant is a number with a decimal point. It is a sequence of digits preceded and followed by a decimal point. General form of floating constant is sign integer part decimal point fractional part. Example is 28.75, -0.00002345, 0.123e5.

Question 15.
What is a character constant? Give an example.
Answer:
Character constant is a single character enclosed within a pair of apostrophes, ‘x’,’?’, ‘D’ etc.

Question 16.
What is a string constant? Give an example.
Answer:
String constant is a sequence of characters enclosed within a pair of double quotes. “Hello”, “Pre-University”, “IIPUC ELECTRONICS”, “2014”, “ASCII”.

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 17.
What are variables? Give an example.
Answer:
The quantity that changes during the execution of a program is a variable. Variables are the names given to identify the specific program elements. Variables are also called identifiers. Sum, height, mass, total, time etc.

Question 18.
Give an example each for valid variables and invalid variables.
Answer:
Valid variables: total, area_triangle, net_salary etc. For invalid variables : 2total, area-triangle, net salary etc.

Question 19.
What are backslash costants?
Answer:
Backslash constants are combination of two characters in which first character is always a back slash (\) and the second can be any one of the characters a,b,f,n,r,t,v, “, \, 0. These are also called escape sequences.

Question 20.
Write the C equivalent expression for (2x+1)(3y+2z)
Answer:
(2*x+1)*(3*y+2*z)

Question 21.
Write any four arithmetic operators and their meaning.
Answer:

  • + addition or unary plus,
  • – subtraction or unary minus,
  • * multiplication,
  • / division,
  • % modulo division.

Question 22.
What is the meaning of a%b? Find the value of 21%4.
Answer:
a%b always results in the remainder of division a/b. The value of 21%4 is 1.

Question 23.
What is the use of logical operator?
Answer:
Logical operators are used to make decisions The results of these operations are either true or false.

Question 24.
If a=3, b=5 and c=6, find a && b || c || (!b) && (!c).
Answer:
a=3, b=5 and c=6, a= 011, b=101 , c=110. a && b || c ||(!b) && (!c): (011&&101)||(110)||(010)& &(001) = 0011| 110||000 = 111= 7.

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 25.
What is data type conversion? Explain.
Answer:
Changing the data type of the variables is called data type conversion or type casting.

Question 26.
Write the general format of ‘scanf( )’ formatted input.
Answer:
General format of scanf( ) formatted input is scanf(“control string”, address list);

Question 27.
What should be the statement for an output displayed as 5.8628e-03? Write its value.
Answer:
For displaying the output 5.8628e-03 the statement is x=0.0058628 printf(“%e”,x);

Question 28.
Mention different conditional control statements.
Answer:
Different conditional statements are if statement, if-else, nested if-else and switch statement.

Question 29.
For what purpose if- statement and if-else statements are used?
Answer:
If statement is used to execute a statement or a set of statements conditionally. It is also called one-way branching. If-else is used when there are two statements which are to be executed – alternatively. It is a two way branching.

Question 31.
Write the syntax of if statement.
Answer:
The syntax of if statement is
if(condition)
{
Statement;
}

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 32.
Write the syntax of if-else statement.
Answer:
The syntax of if-else statement is
if(condition)
{
Statementl;
}
else
{
Statement2;
}

Question 33.
Write the syntax of do while statement.
Answer:
The syntax of do while statement is
do
{
Statement;
}
while(logexp);

Question 34.
Write the syntax of for- statement.
Answer:
The syntax of for statement is
for (expression 1 ;expression2;expression3)
{
Statement;
}

Question 35.
What is use of break statement? Write its syntax.
Answer:
Break statement is used to terminate the loop and exit from a particular switch case label. Syntax for break is

———————
———————
break;
———————-

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 36.
What are the rules used while writing subscripts?
Answer:
Rules for subscripts are

  • each subscript must be an unsigned positive integer constant or an expression
  • subscript of a subscript is not permitted
  • maximum subscript appearing in a program for a subscripted variable should not exceed the declared one
  • subscript value ranges from 0 to one less than the maximum size. If an array has three elements then subscript can be 0,1,2.

Question 37.
Write a C program to find the product of two matrices and print the product matrix.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 2
2nd PUC Electronics Question Bank Chapter 12 C Programming 3
2nd PUC Electronics Question Bank Chapter 12 C Programming 4

Output
Enter rows and column for first matrix; 2
3
Enter rows and column for second matrix; 2
3
Error? column of first matrix not equal to equal to row of second. Enter rows and column for first matrix; 2
2
Enter elements of matrix 1:
Enter elements all;3
Enter elements a12:-2
Enter elements a13 : 5
Enter elements a21 : 3
Enter elements a22 : o
Enter elements a23:4

Enter elements of matrix 2:
Enter elements bn:2
Enter elements bn2:3
Enter elements b2n:-9
Enter elements b22:o
Enter elements b31:o
Enter elements b32:4

Output matrix:
24 29
6 25

2nd PUC Electronics C Programming Three Marks Questions and Answers

Question 1.
Mention the different sections that appear in C programming.
Answer:
Documentation section, link section, definition section, Global declaration section, Function section, subgroup Section are the different sections that appear in C programming.

Question 2.
Write the format of simple C program.
Answer:
Format of a simple C program is
main ( )
{
—————-
Statement;
—————-
}

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 3.
Briefly explain how to write a C program.
Answer:
In writing a C program one style should be used and there should be consistency. Lower case letters are used to write a program. Group program statements are written together. Braces used to mark the beginning and end of the function. C is free from language, one can group statements together on same line. However, this make the program more difficult to understand.

Question 4.
Mention the different types of run time errors.
Answer:
The run time errors are infinite loop in a program, divide by zero, null pointer assignment, data overflow.

Question 5.
Write the different constants used in a C program.
Answer:
The constants used in C are broadly divided as numeric and non numeric constants. Numeric is further divided as integer and float point constant, while non numeric is divided as character and string constants.

Question 6.
Name any six operations.
Answer:
Arithmetic, relational, logical, assignment, increment/decrement, conditional, bitwise, special operators.

Question 7.
Mention the different relational operators and their meaning.
Answer:

Operator Meaning
< Lesser than
<= Less than or equal to
> Greater than
>= Greater than or equal to
= = Equal to
!= Not equal to

Question 8.
Write a C program to check whether the given two numbers are equal.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 34
2nd PUC Electronics Question Bank Chapter 12 C Programming 5

Question 9.
Write a C program to compare two values.
Answer:

2nd PUC Electronics Question Bank Chapter 12 C Programming 6

Question 10.
How do you represent logical AND, OR and NOT operators?
Answer:
Logical AND is represented as &&, Logical OR as || and NOT as!

Question 11.
Briefly explain bitwise operators.
Answer:
Bitwise operator works on bits and perform bit by bit operation. Consider a=5 and b=7 bitwise OR is 01011|0111=0111. For 1010 its l’s complement is 0101.

Question 12.
For an 8-bit computer A=6, B=7, find bitwise ANDing of A and B and bitwise ORing of A and B.
Answer:
In an 8- bit computer, A=6, B=7. Bitwise ANDing of 00000110 &000GQ111 is 00000111. Bitwise ORing of 00000110 | 00000111 is 00000111.

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 13.
Find the bitwise complement of A=00001001, exclusive ORing of A=00101010 and B=10101100.
Answer:
Bitwise complement of A=00001001 is 11110110 and exclusive OR of 00101010 and 10101100 is 10000110.

Question 14.
Write a C program to illustrate the compact representation of arithmetic operations.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 7
2nd PUC Electronics Question Bank Chapter 12 C Programming 8

Question 15.
Write a C program to illustrate the use of increment operator.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 9

Question 16.
Briefly explain operator precedence in C.
Answer:
Operators precedence determines the grouping of terms in an expression. This affects how an expression is evaluated. Certain operators have higher precedence than the others. For example, x= 6+2*4; in this expression x is assigned 14 but not 32, this is because * has higher precedence compared to +.

Question 17.
Which are the input and output functions used in C?
Answer:
To perform input-output operations C provides a library functions. This is called standard input-output library. It is denoted as stdio. Header file containing such library functions is stdio.h. scanf( ), printf( ), getchar( ), putchar( ), gets( ), puts( ), getch( ),
getche ( ) are the standard functions in C performing i/o operations.

Question 18.
Write the formatted and unformatted i/o functions in C.
Answer:
Function scanf( ) is used to read the values for the variables in C from the keyboard. The scanf( ) is used to enter the numeric, character and string type data. It is included in the header file <stdio.h>. C programming provides printf( ) function to display the data on the output device(monitor). Syntax for scanf( ) and printf( ) is printf(“control string”, variable); scanf(“control string”, address_list);

Question 19.
Mention the different character groups and their meaning.
Answer:

Character group Meaning
%e Read a single character
%d Read a decimal integer
%e Read a floating point number
%g Read a floating point number
%h Read a short int number
%i Read a decimal or octal or hexadecimal number
%p Read a pointer
%s Read a string
%u Read an unsigned number
%0 Read an octal number
%x Read a hexadecimal number

Question 20.
How does the monitor display 321 for statement
i) printf(“%d”,x);
ii) printf(“%d”,x);
Answer:
i) 321
ii) 321

Question 21.
How does the monitor display 28.689 for statement
i) printf (“%5.3f”,p);
ii) printf(“%e”,y);
Answer:
i) 28.689
ii) 2.8689e+01

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 22.
Write the display format for the statements
i) printf (“%19.10s”book); Pre-University
ii) printf(“% -21.10s”,book); s-Pre-University
Answer:
i) In this print statement 10 characters are right justified
2nd PUC Electronics Question Bank Chapter 12 C Programming 10
ii) In this print statement 10 characters are left justified
2nd PUC Electronics Question Bank Chapter 12 C Programming 11

Question 23.
Draw a flow chart for if-else statement
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 12

Question 24.
Mention the different control statements.
Answer:
There are two control statements namely conditional control and goto statement respectively. Conditional control further consists of if statement, if-else statement, nested-if statement and switch statement.

Question 25.
Draw a flow chart for if-statement.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 13

Question 26.
Write the syntax for nested- if statement.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 14

Question 27.
Briefly explain loop control statement.
Answer:
Program loop consists of two segments

  • Body of the loop and
  • Control statement.

The test condition should be carefully stated in order to perform the desired number of loop execution. Test condition should transfer the control out of the loop as the condition false other wise control sets up an infinite loop. A looping process would include Setting & initialization of a counter, Execution of the statement in the loop, Test for the specified condition for execution of the loop and Updating the counter.

The C language provides three loop constructs for performing loop operation The While statement, The do-while statement and The for statement.

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 28.
Draw a flow chart for while control statement.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 15

Question 29.
Write the syntax for multi dimentional arrays.
Answer:
Type array name [sizel] [size] [size3]…………. [size n];

2nd PUC Electronics C Programming Four Marks Questions and Answers

Question 1.
Write the features of C.
Answer:
C is a powerful, flexible language that has gained worldwide acceptance in recent years. C is concise, yet powerful in its scope. It is a high-level language that also incorporates features of low-level languages. It is becoming the standard for program development on small machines and microcomputers.

It is possible to apply C to nearly all application areas. Modularity {process of dividing problems into sub-problems) makes C ideal for projects involving several programmers. C permits nearly every programming technique. C is widely available for most brands and type of computers. It is portable. With all the features C is not a difficult language, it is one of the easiest languages to learn and implement.

C programming can be used to write any complex program because of its rich set of built-in functions and operations. C compiler combines the capabilities of an assembly language with the feature of high-level language and therefore it is very much suited for uniting both system software and business packages. Because of its variety of data types, powerful operator programs in C are efficient and fast. C has the ability to extend, it means user-defined functions can also be added to C library.

Question 2.
Write ten basic structure of C programming (overview).
Answer:
C program may contain one or more sections as shown in fig. 1.
Overview of a C program

Documentation Section
Link Section
Definition Section
Global declaration Section
main( ) Function Section
{
Declaration part
Executable part
}
Subprogram Section
Function 1
Function 2
Function 3
Function 4
…………………
(User-defined functions)
Function n

Question 3.
Briefly explain the format of a simple C program.
Answer:
Every C program you create includes the following components
Pre-processor directives
main( )
A pair of flower brackets { }
Declarations and statements
User created sub-programs or functions
{
Declarations and statements
}
User created sub-programs or functions
The above-described components are organized as follows
Pre-processor directives
main( )
{
Declarations and statements
}
User created sub-programs or functions

Pre-processor Directives

A C program contains one or more functions or sub programs. Function is a series of instructions to the computer to perform a specific task. Many functions are already written and compiled in the library supplied. Instead of writing the individual instructions user can tell the compiler to use one of its standard functions. Identifying the class of functions to be used is done in the pre-processor directive.
#include <stdio.h>
#include <string.h>
are some examples of pre-processor directives.
main ( )
Every C program must begin with the function called main( ), which is the identification for the start of the main part of the program and it looks just like main( ).
The parentheses after main( ) are part of the function name and are necessary. They tell the compiler that function is referring to and not the word main. A pair of parentheses must follow every function.

A pair of flower brackets { }

Following main( ) are declarations and statements. An opening brace must appear immediately after the word main( ) and closing brace “}” must follow the last instruction. The flower brackets or braces thus indicate the body of the program, which includes instructions to perform the required task.

Declarations and Statements

The declarations represent that part of the program where all the variables, arrays, functions and so on are identified with their data types. Sometimes the various elements are initialized in this part. The statements can include instructions to perform certain operations such as input or output or assignment. Statements can also include C commands or the names of functions in the library.

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 4.
Draw the flowchart to show the process of compiling and running C program.
Answer:
Flowchart is shown in fig. 1.
2nd PUC Electronics Question Bank Chapter 12 C Programming 16

Question 5.
Write the rules for forming the identifier name.
Answer:
Rules to be followed while creating identifiers:

  1. The first character of an identifier should always start with an alphabet or an underscore, which can be followed by either alphabets or digits or certain symbols.
  2. An identifier may be of any length up to 32 characters. Some compilers limit the length to eight characters.
  3. Identifiers can contain both uppercase and lowercase letters. C is case sensitive, that is, lowercase letters are not converted to uppercase letters when used in identifiers.
  4. Special characters except underscore should not be used in identifiers. Successive underscores are also not allowed.
  5. Identifiers should be single words i.e., blank spaces cannot be included in identifiers.
  6. Reserved words should not be used as identifiers.
Legal identifiers Illegal identifier Legal but poor
Sum
Emp_name
Student_address
Number
age
Varun’s_addr
while
@total sum
do-it
counter
3by2

_help

sumo_1

Question 6.
Write the rules for forming a variable name.
Answer:

  • Variable name consists of Setters, digits & underscore (_)
  • Must begin with a letter. Some systems permit an underscore as the first character.
  • ANSI standard recognizes a length of 31 characters. However, the length should not be normally more than 8 characters, since only the first eight characters are treated significant by the compiler.
  • Uppercase and lowercase are significant, ie TOTAL is not same as total or
  • Variable name should not be a keyword.
  • White space is not allowed.

Example: Valid: temp, avg, suml ,total, ph value, T_raise, mark, i, j Invalid: 123,25th 5times, (area) abc$ char, int, group one abc-5

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 7.
If a=25 and b=6, find
(i) a+b
(ii) a – b
(iii) a * b
(iv) a/b
(v) a%b
(vi) -a%b
(vii) a%-b
Answer:
a=25 and b = 6.
(i) a+b = 25+6 = 31
(ii) a-b = 25-6 = 19
(iii) a*b= 25*6 =150
(iv) a/b=25/6 = 4
(v) a%b=25%6 = 1
(vi) -a%b= -25%6 = -1
(vii) a% -b= 25% -6 = 1

Question 8.
Write the C program to convert the given number of days into months and days. Enter days as 196 days.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 17

Output:
Enter the number of days 196
months = 6
days= 16

Question 9.
Write the C program to accept three numbers and compute their sum and average. Find the sum and average of 3,7 and 8.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 18
2nd PUC Electronics Question Bank Chapter 12 C Programming 19
Output:
Enter three numbers 3 7 8
sum -18
average = 6.000000

Question 10.
Write the C program to accept the radius of a circle and compute its area and perimeter. Radius, r = 7m.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 20
Output:
Enter the radius 7
Area of the circle = 153.957993m
Perimeter = 43.987999m

Question 11.
Write the C program to accept two floating point numbers and compute their ratio. If the ratio is greater than zero then it should exchange the contents of the numbers.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 21
Output:
Enter the two numbers 18.0
24.0
Ratio = 0.750000
a = 24.000000,
b=18.000000

Question 12.
Write the C program to accept two numbers and check whether they are equal or unequal.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 22
Output:
Enter the two numbers
15
24
15 and 24 are NOT equal
Enter the two numbers
25
25
25 and 25 are equal

Question 13.
Write the C program to accept three numbers and print the largest amongst them.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 23
Output:
Enter the three numbers 15
24
48
48 is largest number among 15,24 and 48

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 14.
Write the C program to find the roots of a quadratic equation ax2 + bx + c = 0 using switch statement.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 24
2nd PUC Electronics Question Bank Chapter 12 C Programming 25

2nd PUC Electronics Question Bank Chapter 12 C Programming 26

Output:
Enter the values of A; 1 Enter the values of B : 3 Enter the values of C: 8 RESULT:
Roots are complex/imaginaiy number. Roots of quadratic equation are:
Root-1 -1.500*2.398!
Root-2 -1.500-2.398i
Enter the values of A: 2 Enter the values of B : 4 Enter the values of C: 2 RESULT:
Both roots are real numbers and equal. Root of quadratic equation is:
Root-1 = Root-2 = -1.000
Enter the values of A: o Enter the values of B : 5 Eater the values of C : 8 RESULT:
Equation is linear.
Eater the values of A: 3 Enter the values of B : 8 Enter the values of C : 2 RESULT:
Roots are real numbers and unequal. Roots of quadratic equation are: Root-i = -0.279 , Root-2 = -2.387

Question 15.
Write the C program to print the sum of all even integers between 1 and 55.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 27
2nd PUC Electronics Question Bank Chapter 12 C Programming 28
Output:
sum of all even numbers between 1 and 55 is 756

Question 16.
Write the C program to print the sum of the first 89 natural numbers.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 29
Output:
sum of the first 89 natural numbers is 4005

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 17.
Write the C program to accept n integers and store them in an array called num and also print them.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 30

Output:
Enter the size of an array
3
Enter the elements of an array one by one
10
22
13
Array is
Num[0] = 10
Num[1] =22
Num [2] = 13

Question 18.
Write the C program to accept the integer arrays and find the sum of the corresponding elements of the two arrays.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 31
Output:
Enter the size of the arrays A and B 3
Enter the elements of the array A one by one
10
22
13
Enter the elements of the array B one by one
10
22
13
Sum of elements of A and B 20 44 26

2nd PUC Electronics Question Bank Chapter 12 C Programming

Question 19.
Write the C program to accept two matrices of the same order and find the sum of the corresponding elements of the matrices and print the sum matrix.
Answer:
2nd PUC Electronics Question Bank Chapter 12 C Programming 32
2nd PUC Electronics Question Bank Chapter 12 C Programming 33
Output:
Enter the order of the matrix .2 X 2
Enter the elements of the matrix 1 one by one 10
20
30
40
Enter the elements of the matrix2 one by one 10
20
30
40
Sum matrix is——
20
40
60
80

2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः

Students can Download 2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः, Notes Pdf, 2nd PUC Sanskrit Textbook Answers, helps you to revise complete Karnataka State Board Syllabus and score more marks in your examinations.

Karnataka 2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः

1. सन्धिं विभजत।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 1
उत्तरम्
बाल्यादेव = बाल्यात् + एव
एतन्नयेत् = एतत् + नयेत्
भिक्षाटनम् = भिक्षा + अटनम्

सन्धिं योजयत।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 2
उत्तरम्
वयसि + एव = वयस्येव
कृतयः + तु = कृतयस्तु
कियत् + धनम् = कियद्धनम्

2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः

2. विग्रहवाक्यं लिखत।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 3
उत्तरम्
अनवश्यकम् = न अवश्यकम्।
चिन्तनपद्धतिः = चिन्तनस्य पद्धतिः।
ज्ञानदाहः = ज्ञानस्य दाहः।

समस्तपदं लिखत।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 4
उत्तरम्
धैर्य च स्थैर्यंच स्वाभिमानः च = धैर्यस्थैर्यस्वाभिमानाः।
राष्ट्रस्य कविः = राष्ट्रकविः
ज्योष्ठश्चासौ पुत्रश्चं = ज्येष्ठपुत्रः

3. लिङ्ग-विभक्ति-वचनानि लिखत।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 5
उत्तरम्
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 12

2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः

4. लकार-पुरुष-वचनानि लिखत।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 6
उत्तरम्
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 13

5. पदपरिचयं कुरुत।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 7
उत्तरम्
सम्पाद्य – ल्यबन्ताव्ययम
अध्येतव्यः – तव्यत्प्रत्ययः
विदित्वा – क्त्वान्ताव्ययम्

6. प्रयोगं परिवर्तयत।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 8
उत्तरम्
पत्रिकाम् आरब्धवान्।
पत्रिकाम् आरब्धम्।

कृष्णरावेण इयं घटना स्मर्यते।
कृष्णरावः इयं घटनां स्मरति।

2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः

योग्यताविस्तारः-
1. पाठे विद्यमानानि अनुनासिकसन्धेः उदाहरणानि चित्त्वा लिखत।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 9
उत्तरम्
1. मुखान्निसरन्ति

2. पाठे विद्यमानानि लोट् लकारस्य उदाहरणानि चित्त्वा लिखत –
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 10
उत्तरम्

  1. भवतु
  2. स्वीकरोतु
  3. जाग्रत
  4. सञ्चारयत
  5. पूरयत
  6. चिन्तयत
  7. पठत
  8. निबोदत

2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः

3. कन्नडभाषया – आङ्ग्लभाषया वा अनुवदत।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 11
उत्तरम्
अ) कृष्णशास्त्रीमहोदयः आदर्शः अध्यापकः अभवत् ।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 14
Krishnashastri became an ideal teacher.

आ) एतेषां बङ्किमचन्द्रः कृतिः केन्द्र साहित्य – अकादमी द्वारा पुरस्कृता।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 15
His work called ‘Bankimchandra’ has been honoured by the Kendra Sahitya Akademi.

इ) विद्यार्थिनां विद्यार्जनमेव तपः ।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 16
Learning itself is a penance for students.

2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः

ई) ध्वन्यालोकः इति कृतेः कन्नडभाषानुवादः डा. के. कृष्णमूर्ति महोदयेन कृतः।
2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः 17
The Kannada translation of the work called ‘Dhvanyaloka’ was done by Dr. K. Krishnamurthy.

व्याकरणदोषं परिहरत

भाषायां दोषमुक्ततया व्यवहारं कर्तुं व्याकरणम् अत्यवश्यकम्। तत्रापि साधुप्रयोगः अपेक्षितः। साधुप्रयोगार्थं केचननियमाः परिशिष्टभागे (P. 158) प्रदत्ताः। तत्साहाय्येन अत्र प्रदत्तान् दोषान् दूरीकृत्य साधुप्रयोगं ज्ञातुम् अर्हन्ति विद्यार्थिनः।

1. अम्बा सह स्नातुम् अभ्यागमम् ।
अम्बया सह स्नातुम् अभ्यागमम्।

2. देवाः अपि अस्त्रेण विभ्यति।
देवाः अपि अस्त्रात् विभ्यति।

3. भवान् गन्तुम् अर्हसि।
भवान् गन्तुम् अर्हति।

4. मोगल चक्रवर्तिणां सह अयुध्यत।
मोगल् चक्रवर्तिभिः अयुध्यत ।

2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः

5. भवान् यथाकामं गच्छत।
भवान् यथा कामं गच्छतु।

6. शालायाः परितः वृक्षाः सन्ति।
शाला परितः वृक्षाः सन्ति।

7. जलात् अन्तरेण मीना न वसन्ति।
जलम् अन्तरेण मीना न वसन्ति ।

8. व्रतभङ्गेन भीतेव अलक्षत।
व्रतभङ्गात् भीतव अलक्षत।

9. तस्य विना तृणमपि न चलति।
तेन विना तृणमपि न चलति।

10. यथा गुरुः रोचते।
यथा गुरवे रोचते।

2nd PUC Sanskrit Workbook Answers Chapter 10 कृष्णशास्त्रीमहोदयः

11. मध्याहः आरोहति दिवाकरः।
मध्याह्नम् आरोहति दिवाकरः।

12. इन्द्रः दुष्यन्तस्य प्रियसखा आसीत्।
इन्द्रः दुष्यन्तस्य प्रियसखः आसीत्।

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