Exercise: Communication Systems

Questions for: Communication Systems

Assertion (A): A video monitor does not need RF tuner and IF amplifier

Reason (R): The picture tube in TV is basically a CRT.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
A is wrong but R is correct
Answer: B
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In VCR, the chrominance signal's frequency is
A:
up converted during recording and down converted during playback
B:
down converted during recording and up converted during playback
C:
not changed during recording and playback
D:
any of the above depending on VCR system
Answer: B
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In shot noise
A:
the current rises around mean value
B:
the current rises to peak value, decreases to zero and then again rises
C:
the current may become negative
D:
the current is always less than the mean value
Answer: D
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Assertion (A): Demodulation of SSB and AM signals is exactly similar

Reason (R): The basic SSB demodulation device is product detector.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
A is wrong but R is correct
Answer: D
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In case of stabilized reactance modulator AFC system
A:
phase modulator is converted into frequency modulation by equalizer circuit
B:
the discriminator must have a fast time constant to provide demodulation
C:
the higher discriminator frequency, the better oscillator frequency
D:
the discriminator frequency must be too low, or the system will fail
Answer: C
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