Exercise: Communication Systems

Questions for: Communication Systems

The atmospheric absorption of radio waves depends on
A:
frequency of wave
B:
the distance from transmitter
C:
wave polarisation
D:
atmospheric polarisation
Answer: A
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ADM stands for
A:
Angle Delta Modulation
B:
Angle Digital Modulation
C:
Adaptive Delta Modulation
D:
Adaptive Digital Modulation
Answer: C
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Which wave is also called surface wave?
A:
Ground wave
B:
Sky wave
C:
Space wave
D:
Both (b) and (c)
Answer: A
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In a certain '12 channel TDM' system it is found that channel no. 3 and channel no. 8 are connected to the same input signal. This technique
A:
wastes the channel capacity
B:
takes care of different sampling rate
C:
is required when different bandwidth signals are to be transmitted
D:
reduces noise
Answer: B
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A plot of modulation index vs carrier amplitude yields a
A:
horizontal line
B:
vertical line
C:
parabola
D:
hyperbola
Answer: D
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