Exercise: Satellite Communication

Questions for: Satellite Communication

Low-orbit satellites are not used for communications because they
A:
produce sonic booms
B:
do not provide 24 hour/ day contact to the users on Earth
C:
heat up and melt
D:
none
Answer: C
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The average noise temperature of Earth, as viewed from space, is __________ °K.
A:
254
B:
303
C:
100
D:
500
Answer: A
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In satellite communication, highly directional antennas are used to
A:
direct the spot beam to a particular region of space on Earth
B:
strengthen the beam to overcome the cosmic noise
C:
make corrections in change of polarisation of the beam
D:
select a particular channel in transmission and reception
Answer: A
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Geosynchronous communication satellites travel around the earth in circular orbits with a forward speed of about __________ km/h.
A:
11200
B:
0
C:
36000
D:
22800
Answer: A
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A typical error rate on satellite circuits is one bit error in
A:
107
B:
103
C:
102
D:
1010
Answer: A
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