Electronics and Communication Engineering - Communication Systems

1. 

If a signal band limited for fm is sampled at a rate less than 2 fm the reconstructed signal will be

A. smaller in amplitude
B. distorted
C. having higher frequencies suppressed
D. none of the above

Answer: Option B

Explanation:

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2. 

A better SNR can be obtained in a PCM by

A. increasing sampling rate above Nyquist rate
B. decreasing the code bits
C. reducing channel bandwidth
D. increasing Quantization levels

Answer: Option D

Explanation:

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3. 

The baud rate is

A. always equal to the bit transfer rate
B. equal to twice the bandwidth of an ideal channel
C. not equal to the signalling rate
D. equal to one half the bandwidth of ideal channel

Answer: Option B

Explanation:

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4. 

The type of noise that interfere very much with high frequency transmission is

A. white
B. transit time
C. flicker
D. shot

Answer: Option B

Explanation:

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5. 

In communication systems, the modulating signal is also called

A. base band signal
B. side bands
C. auxiliary signal
D. none of the above

Answer: Option A

Explanation:

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