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EC 2251-Electronic Circuits II-April May 2015-Typed Version
#1


Department of Electronics and Communication Engineering.

Fourth Semester
Regulation 2008/2010
April/May 2015 Question Paper
EC 2251 – Electronic Circuits –II

PART-A
1. What are the advantages of negative feedback?
2. State Nyquist stability criterion?
3. Draw the equivalent circuit of crystal oscillator.
4. Why LC oscillator is preferred over RC oscillator at radio frequencies?
5. What is unloaded Q?
6. What are the different coil losses?
7. Draw the clipper circuit for two independent clipping levels.
8. Why commutating capacitors are used in bistable multivibrator?
9. Mention the applications of pulse transformers.
10. Name the different methods of generating a time – base waveforms.
PART-B
11.(a) Explain the impact of negative feedback on bandwidth, stability, input and output impedances of an amplifier.
Or
(b) with an example circuit, explain the method of identifying the feedback topology. Also determine the feedback factor.

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