Electronics and Communication Engineering - Satellite Communication

Exercise :: Satellite Communication - Section 1

36. 

The Sun blots out the transmission of a geosynchronous satellite twice a year when satellite passes directly in front of it. This outage lasts for about

A. 10 minutes on 5 consecutive days
B. 5 minutes on 10 consecutive days
C. 30 minutes for 5 consecutive days
D. one hour for 5 consecutive days

Answer: Option A

Explanation:

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37. 

In satellite communication, frequency modulation is used because satellite channel has

A. small bandwidth and negligible noise
B. large bandwidth and severe noise
C. maximum bandwidth and minimum noise
D. high modulation index

Answer: Option B

Explanation:

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38. 

In the case of a 70-MHz IF carrier for a transponder bandwidth of 36 MHz, energy must lie between MHz.

A. 34 and 106
B. 52 and 88
C. 106 and 142
D. 34 and 142

Answer: Option B

Explanation:

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39. 

Which of the following factor does NOT contribute to the drift of a geostationary satellite from its stationary position in space?

A. Pressure of solar radiations
B. Gravitational changes due to Sun and Moon
C. Oblateness of the Earth
D. Weight of the satellite

Answer: Option D

Explanation:

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40. 

In communication satellites, the up-link normally operates at a higher frequency than the down-link because it

A. gives a narrow beam shining into space
B. results in lesser signal attenuation
C. gives better beam-shaping
D. is easier to polarize a high frequency beam

Answer: Option A

Explanation:

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