Exercise: Communication Systems

Questions for: Communication Systems

In the spectrum of an FM wave
A:
When modulation index is large, carrier frequency disappears
B:
carrier frequency cannot disappear
C:
amplitude of any side band depends on modulation index
D:
the total number of side bands depend on modulation index
Answer: C
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For F2 layer the critical frequency is about
A:
500 MHz
B:
100 MHz
C:
25 MHz
D:
10 MHz
Answer: D
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The inductance of connecting leads can be a source of
A:
low frequency parasitics
B:
high frequency parasitics
C:
carrier frequency parasitics
D:
none of the above
Answer: B
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Noise figure is defined as
A:
B:
C:
D:
Answer: C
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The power required to produce a gain of 10 dB over 4 W of original power is __________ watt.
A:
80
B:
40
C:
0.4
D:
8
Answer: C
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