Exercise: Communication Systems

Questions for: Communication Systems

In a channel voice coder, the outputs of sixteen 20 Hz low pass filters are sampled, multiplexed and A/D converted. If sampling is at 40 samples/second and 3 bits/sample represents each voltage sample, the bit rate is about
A:
1.9 k bits/sec
B:
0.95 k bits/sec
C:
3.8 k bits/sec
D:
7.6 k bits/sec
Answer: A
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Satellite communication uses frequencies in the range of
A:
3 to 6 GHz
B:
3-10 MHZ
C:
10-50 GHz
D:
100-200 GHz
Answer: A
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If the radiated power of AM transmitter is 10 kW, the power in the carrier for modulation index of 0.6 is nearly.
A:
8.24 kW
B:
8.47 kW
C:
9.26 kW
D:
9.6 kW
Answer: B
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The IF bandwidth of a radar receiver is inversely proportional to
A:
pulse interval
B:
pulse width
C:
PRF
D:
none of the above
Answer: B
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The unit for luminous energy is
A:
lumens/sec
B:
lumens/m2
C:
lumen-sec
D:
lumen/m
Answer: C
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