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Posted By: Rajasekaran Member Level: Silver Posted Date: 17 Dec 2007
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2005 Anna University B.E Electronics and Communication EC 241 – ELECTRONIC CIRCUITS – II Question paper
B.E/B.Tech.DEGREE EXAMINATION,NOVEMBER/DECEMBER 2005.
Fourth Semester
Electronics and Communication Engineering
EC 241 – ELECTRONIC CIRCUITS – II
Time: Three hours Maximum:100 marks
Answer ALL questions
PART A – (10 * 2 = 20 marks)
1. What are the effects of negative feedback on gain and input impedance of an
amplifier?
2. What is a negative resistance oscillator?
3. How does the crystal oscillator maintains stable frequency?
4. Why is it difficult to have variable frequency operation with an RC phase-
shift oscillator?
5. What are the drawbacks of LC oscillators?
6. What is the effect of Q on the resonance circuit?
7. What are the advantages of double tuned amplifier over single tuned
amplifier?
8. Draw the circuit diagram of a monostable multivibrator (using transistors).
9. What are the applications of pulse transformers?
10. Draw the output response of a RC high-pass filter for a step input and a ramp
input.
PART B - ( 5 * 16= 80 marks)
11. (i) Describe briefly the general characteristics of negative feedback
amplifier. (8)
(ii) Draw the basic circuit of the voltage shunt feedback amplifier and
describe the concepts involved in such an amplifier. (8)
12. (a) (i) With a circuit diagram, explain the principles involved in the
Armstrong oscillator. (8)
(ii) Describe the principles involved in the Twin-T network. (8)
Or
(b) (i) Draw the circuit diagram of Wien bridge oscillator and explain its
working principles. (8)
(ii) Discuss briefly about the properties of quartz crystal. Draw the
electrical equivalent circuit of the crystal and explain. (8)
13. (a) Explain a neat circuit diagram, explain the performance of single tuned
amplifier. (16)
Or
(b) (i) Describe the principles involved in stagger tuned amplifier.(8)
(ii) Discuss briefly about neutralization in tuned amplifiers. (8)
14. (a) Draw the circuit diagram of collector coupled astable multivibrator and
explain its operation, with relevant waveforms. (16)
Or
(b) Draw the circuit diagram of a Schmitt trigger and explain its operation
showing relevant input and output waveforms. (16)
15. (a) With a neat circuit diagram and relevant waveforms, explain the
performance of a triggered transistor blocking oscillator. (16)
Or
(b) With suitable circuit diagrams, explain the following:
(i) UJT Sawtooth generator. (8)
(ii) Miller Sawtooth generator. (8)
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