Exercise: Communication Systems

Questions for: Communication Systems

An amplifier of passband 450 kHz to 460 kHz will be named as
A:
video amplifier
B:
audio frequency amplifier
C:
tuned voltage amplifier
D:
wideband amplifier
Answer: C
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If B is channel bandwidth, S is signal power and N is the total noise within the channel bandwidth, the channel capacity C of a white band limited gaussian channel is
A:
B:
C:
D:
Answer: A
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Over which frequency range the effect of atmospheric noise is significant?
A:
Over 35 MHz
B:
Below 30 MHz
C:
Between 30 MHz and 100 MHz
D:
Between 100 MHz and 150 MHz
Answer: D
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An oscillator at 4.2 MHz is followed by two frequency doublers and two triplers. The output frequency will be
A:
84 MHz
B:
112.4 MHz
C:
151.2 MHz
D:
303.4 MHz
Answer: C
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A signal m(t) amplitude modulates a carrier Ac cos ωct. The final signal will be
A:
[Ac m(t)] cos ωct]
B:
Ac . [1 + m(t)] cos ωct
C:
Ac + [m(t)] cos ωct
D:
Ac cos ωct + m(t)
Answer: B
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