Exercise: Communication Systems

Questions for: Communication Systems

Companding is used in PCM to
A:
reduce bandwidth
B:
increasing S/N ratio
C:
get almost uniform S/N ratio
D:
increase bandwidth
Answer: C
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Which one of the following is an indirect way of generating FM?
A:
Armstrong modulator
B:
Varactor diode modulator
C:
Reactance FET modulator
D:
Reactance bipolar transistor modulator
Answer: A
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Which is most important subsystem for recovering and reconstructing signal in a TDM system?
A:
Envelope detector followed by a low pass filter
B:
Synchronization ckt for proper timing
C:
Bandpass filter to segregate channels
D:
Coherent detector to ensure frequency and phase connection
Answer: A
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The complete video signal consists of
A:
video signal and synchronising pulses
B:
video signal, synchronising pulses and blanking pulses
C:
video signal corresponding to picture information only
D:
video signal and blanking pulses
Answer: B
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If the circumference of a spherical target is between 1 to 10 wavelength in a radar system, the situation is called
A:
resonance region
B:
Rayleigh region
C:
optical region
D:
binomial region
Answer: A
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