Electronics and Communication Engineering - Communication Systems

1. 

At a given probability of error, binary coherent FSK is interior to binary coherent PSK by

A. 6 dB
B. 3 dB
C. 2 dB
D. 0 dB

Answer: Option B

Explanation:

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2. 

In a TV receiver the video IF amplifier provides a gain of about

A. 5 dB
B. 20 dB
C. 60 dB
D. 200 dB

Answer: Option C

Explanation:

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3. 

Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth?

A. VSB
B. DSB-SC
C. SSB
D. AM

Answer: Option C

Explanation:

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4. 

Switching systems

A. are limited to small data networks
B. require additional lines
C. are not used in data system
D. improve the efficiency of data transfer

Answer: Option D

Explanation:

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5. 

Which one of the following statements is wrong. The radar cross-section of a target?

A. depends on frequency
B. may be reduced by special coating of non-spherical target
C. depends on the aspect of target if it is non-spherical
D. is equal to actual cross-sectional area for small targets

Answer: Option D

Explanation:

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