Electronics and Communication Engineering - Communication Systems

1. 

A bit synchronizer regenerates at the receiver a clock waveform which is

A. synchronous with original clock waveform
B. out of phase by 180° with original clock waveform
C. out of phase by 90° with the original clock waveform
D. none of the above

Answer: Option A

Explanation:

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2. 

Probability of error in DPSK is less than PSK

A. true
B. false
C. equal
D. depend upon noise

Answer: Option A

Explanation:

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3. 

Zero mean Gaussian noise of variance N is applied to a half wave rectifier. The mean squared value of the rectified output will be

A. 0
B. N/2
C. N/2
D. N

Answer: Option B

Explanation:

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4. 

Two sine waves of amplitude A1 and A2 are multiplied. The amplitude of the spectral component is

A.
B. A1A2
C.
D. (A1A2)1/2

Answer: Option A

Explanation:

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5. 

In radar display system PPI stands for

A. Pulse Position Indicator
B. Plan Position Indicator
C. Phase Position Indicator
D. Point Position Indicator

Answer: Option B

Explanation:

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