Electronics and Communication Engineering - Communication Systems

1. 

A receiver has poor selectivity. It will also have poor

A. sensitivity
B. double spotting
C. blocking
D. diversity reception

Answer: Option C

Explanation:

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2. 

The depth of modulation is doubled in FM system then, the power transmitted

A. increase by factor of 2
B. increase by factor of 3
C. increase by factor of 2
D. none of the above

Answer: Option D

Explanation:

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3. 

Ground wave can be used for communication upto

A. 5 kHz
B. 12 kHz
C. 16 kHz
D. 25 kHz

Answer: Option C

Explanation:

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4. 

A Marconi antenna

A. is a grounded antenna with a length equal to λ/4
B. is an ungrounded antenna with a length equal to λ/4
C. has a length equal to 1
D. has a length equal to λ/2

Answer: Option A

Explanation:

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5. 

When large amount of power is required, a push pull amplifier is designed for operation as

A. class A
B. class B
C. class C
D. class AB

Answer: Option B

Explanation:

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