Electronics and Communication Engineering - Communication Systems

31. 

In FM noise can be decreased by a feature that AM does not have

A. increasing deviation
B. decreasing deviation
C. reducing modulation index
D. increasing modulation index

Answer: Option C

Explanation:

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32. 

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: Option C

Explanation:

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33. 

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: Option D

Explanation:

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34. 

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: Option D

Explanation:

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35. 

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: Option B

Explanation:

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