GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- IV (Old) EXAMINATION - WINTER 2019
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Subject Code: 141102 Date: 16/12/2019
Subject Name: Communication Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Compare AM, FM and PM 07
(b) Explain how digital communication can reduce the noise. State and prove the sampling theorem. 07
Q.2 (a) Explain need of modulation. Derive equation for amplitude modulation and draw amplitude spectrum for m=1. 07
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(b) Explain Armstrong method of FM generation. 07
OR
(b) What is SSB-SC modulation? Explain filter method of side band suppression. 07
Q.3 (a) Write short note on Superhetrodyne receiver. 07
(b) Explain the FDM System for telephone communication with the help of block diagram 07
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OR
Q.3 (a) Explain the quantization process used in PCM with figure 07
(b) Explain the principal of fiber optic data transmission and discuss advantages. 07
Q.4 (a) Derive the friss formula for overall noise factor of amplifiers in Cascade. 07
(b) Explain Terrestrial Microwave Links with-example. 07
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OR
Q.4 (a) Explain Station keeping for satellite. 07
(b) Draw and explain composite video'signal. Explain each component. 07
Q.5 (a) Draw and explain a circuit-diagram of IF section of TV receiver and explain it briefly. 07
(b) Explain Terrestrial Microwave Links with example. 07
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OR
Q.5 (a) Explain the need, advantages and disadvantages of coding. 07
(b) List color television standards. Discuss PAL-B standard 07
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