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JNTU B.Tech II Year ANALOG ELECTRONICS Previous Question Paper (April/May - 2023 - R16)

B.Tech | II Year | II Semester | R16 | April/May - 2023

Answer PaperPaper Code: 134SAMaximum Marks: 75Time: 3 Hours

Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.

Part A

125 marks
a
List the benefits of h-parameters.
2 marks

Answer

The primary benefits of h-parameters are that they are real numbers at audio frequencies, making them easy to measure experimentally, and they are convenient for circuit analysis because they relate input and output voltages and currents using standard network theory.

b
Why Darlington connection cannot be used for number of stages?
3 marks

Answer

The Darlington connection cannot be used for many stages because the leakage current of the first transistor is amplified by the subsequent stages, leading to significant output offset currents. Additionally, the bandwidth decreases drastically with each added stage, and the cumulative phase shift can lead to instability if feedback is applied.

c
What is relation between fT and fβ?
2 marks

Answer

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d
What is significance of all resistive components of hybrid π model?
3 marks

Answer

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e
State the advantages and disadvantages of cascode stage.
2 marks

Answer

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f
What are the features of Source follower?
3 marks

Answer

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g
An amplifier has a gain of 300, when a negative feedback is applied the gain is reduced to 240. Find the feedback ratio.
2 marks

Answer

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h
What do you mean by sampling and mixing networks?
3 marks

Answer

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i
What do you mean by unloaded and loaded Q in tuned amplifier?
2 marks

Answer

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j
Discuss the necessity of heat sink.
3 marks

Answer

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Part B

210 marks
a
Giving the neat circuit setup explain how the low frequency ‘h’ parameters can be measured directly for CE transistor without plotting static characteristics.
5 marks

Answer

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b
Discuss the low frequency response of BJT and explain the effect of coupling and bypass capacitors.
5 marks

Answer

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OR
310 marks
a
Explain the Distortion in amplifiers.
5 marks

Answer

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b
Given a single stage transistor amplifier with hic= 1.1 KΩ, hrc=1, hfc=-51, hoc=25µA/V. Calculate AI, AV, Ri, Ro for the CC configuration with RS=RL=10 KΩ.
5 marks

Answer

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410 marks
a
Derive the expression for current gain with resistive load.
5 marks

Answer

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b
Given the transistor measurements made at Ic=5mA, VCE=10V and at room temperature hfe=100, hie=600. Aie=10 at 10MHz, Cc=3pF. Find fb, fT, Ce, rbe and rbb.
5 marks

Answer

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OR
510 marks
a
Prove that in hybrid π model, the diffusion capacitance is proportional to emitter bias current.
5 marks

Answer

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b
Derive expression for gain bandwidth products for an amplifier.
5 marks

Answer

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610 marks
a
Draw the small signal equivalent circuit of diode connected MOSFET and derive expression for AV.
5 marks

Answer

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b
Obtain the characteristics of MOSFET in depletion region.
5 marks

Answer

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OR
710 marks
a
What is folded cascode amplifier? Explain its operation.
5 marks

Answer

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b
Draw the Common gate JFET amplifier and explain.
5 marks

Answer

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810 marks
a
Draw the circuit diagram of a voltage shunt feedback amplifier using BJT and derive expression for voltage gain with feedback.
5 marks

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b
Derive the Amplitude conditions that are to be satisfied in LC oscillators.
5 marks

Answer

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OR
910 marks
a
A quartz crystal that the following constants. L=50mH, c1= 0.02pF, R=500Ω, C2=12pF. Find the value of fs and fp. If the external capacitance across the crystal changes from 5pF to 6pF. Find the changes in frequency of oscillations.
5 marks

Answer

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b
For the circuit shown in figure. Calculate (i) Avf (ii) Rif and (iii) Rof where these parameters have their usual meaning. The transistor parameters are hie=1, hre=0, hfe=100 and hoe=0.
5 marks

Answer

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1010 marks
a
Discuss the frequency response of tuned Amplifier.
5 marks

Answer

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b
Prove that the Maximum efficiency of a Transformer coupled class A amplifier is 50%.
5 marks

Answer

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OR
1110 marks
a
Design a push pull Class B Power amplifier to achieve maximum output power to a 10Ω load. The two transistors have the following ratings. Pd(max) = 4W, Vce(max) = 40V, Ic(max)=1A. Assume a reasonable value of data wherever necessary.
5 marks

Answer

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b
Derive Q-factor expression of a small signal single-tuned Amplifier.
5 marks

Answer

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About this paper

This page contains the solved question paper with answers of ANALOG ELECTRONICS from JNTU for B.Tech EEE II Year II Semester, April/May - 2023, R16.

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