Satellite Communication - Section 1 (3)

Directions to Solve

Satellite Communication - Section 1

17.

Which one of the following statement is correct?

A.	Satellite spacing is not affected by the bandwidth of the transmitting earth station
B.	Beamwidth is independent of antenna size and frequency band used
C.	The width of a beam in space is inversely proportional to the width of the transmitting antenna
D.	Use of high-frequency bands permits less number of satellites to share the orbit

Answer: Option C

Explanation:

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18.

Orbital disturbances of a geosynchronous satellite are caused by the

A.	moon
B.	sun
C.	earth
D.	all of the above

Answer: Option D

Explanation:

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19.

At present, the radio-frequency band mainly used by most satellites is

A.	EHF
B.	UHF
C.	VHF
D.	SHF

Answer: Option D

Explanation:

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20.

The useful operational life of INSAT-IB (launched in 1983) is expected to end by

A.	1992-93
B.	1991-92
C.	1989-90
D.	1993-94

Answer: Option C

Explanation:

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21.

The quality of a space-link is measured in terms of the __________ ratio.

A.	C/N
B.	S/N
C.	G/T
D.	EIRP

Answer: Option A

Explanation:

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22.

Which one of the following statements regarding compandor is FALSE?

A.	It compresses the higher-amplitude parts of a signal before modulation and expands them back to normal again after demodulation.
B.	It gives preferential treatment to the weaker parts of the signal
C.	For weaker signals it gives a poor ratio of signal strength to quantizing error
D.	Weaker signals, traverse more quantum steps than they would do otherwise and so quantizing error is reduced.

Answer: Option C

Explanation:

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23.

Which one of the following statements regarding DSI is wrong?

A.	It is a digital form of TASI
B.	Though it is more efficient than TASI, it is much slower
C.	A speaker has to wait (it at all) for only a few milliseconds for reallocation of channel
D.	It has increased the capacity of satellite channels by a factor of 2.2 or more with out degrading speech quality

Answer: Option B

Explanation:

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24.

As compared to 17.34° antenna, the total increase in the signal relayed by 4.5° antenna of INTELSAT-IV is

A.	14.85
B.	220
C.	78
D.	3.85

Answer: Option B

Explanation:

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