Cochin University of Science and Techology (CUST) 2007 B.Tech 2 nd year communication engineering - Question Paper

University ques. Paper
Communication engineering.

May 2004 (max marks: 100)


1. a) explain the types,causes,& effects of different forms of noise in communication
system

b) discuss continuous spectra & discrete spectra.
OR
2. a) explain the bandwidth requirement of nonsinusoidal waveform in
communication systems.
b) describe modulation and discuss the need for modulation

3. a) describe amplitude modulation and modulation index

b) What is the frequency spectrum of AM wave?
OR
4. a) Compare frequency modulation and phase modulation.Comment on the side
bands
b) describe angle modulation and comment on the spectral components.

5. a) discuss phasing method of generating SSBSC modulation.

b) discuss with block diagram the generation of FM Armstrong system

6. a) discuss the generation of DSB-SC waveform.

b) discuss the working of an FM stereo transmitter.

7. a) Draw the block diagram of communication receiver & discuss.

b) What is the significance of SNR, selectivity & sensitivity in receivers?
OR

8. a) discuss Tuned Radio frequency receiver .

b) Draw the Basic Radio detector circuit & discuss.

9. a) elaborate the various kinds of communication switching networks & discuss
every one.

b) discuss traffic load in a telephone system.

OR

10. a) discuss the various kinds of signaling.

b) Write short notes on:

1) Cross-bar switch

2) Traffic variation.

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Earning:   Approval pending.