EC2252 Communication Theory May June 2014 Question Paper - Scan Version

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Question Paper Code 513991

B.E. / B.Tech. DEGREE EXAMINATION, MAY/JUNE 2014.

Fourth Semester

Electronics and Communication Engineering

EC 2252/EC 42/EC 1252/080290020 - COMMUNICATION THEORY

(Regulation 2008)

(Common to PTEC 2252 Communication Theory for B.E. (Part-Time) Third

Semester ECE - Regulation 2009)

Time : Three hours
Maximum: 100 marks.

Answer ALL questions.
PART A - (10 x 2 = 20 marks)
1. State the differences between single side band and vestigial side band
transmission systems.
2. For an AM system, the instantaneous- values of carrier and modulating signal are 60 sin wt and 40 sin wt respectively. Determine the modulation index.
3. Define white noise.
4. If the maximum phase deviation in -a phase modulation system when a modulating signal of 10V is applied is 0.1 radian, determine the value of phase deviation constant.
5. State the Shannon's theorem.
6. State the need for pre-emphasis and de-emphasis circuits m the field of communication.
7. Derive an equation for the modulated signal of an AM system.
8. Why is frequency modulation preferrable for voice transmission?
9. Define noise figure.
10. Define the sensitivity characteristics of a radio receiver.

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