Electronics and Communication Engineering - Communication Systems

1. 

In VCR the luminance signal is recorded by

A. frequency modulation
B. phase modulation
C. amplitude modulation
D. direct recording

Answer: Option A

Explanation:

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2. 

Assertion (A): In digital communication data is coded prior to being transferred.

Reason (R): A number of codes for digital data processing are available.

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 B

Explanation:

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3. 

In FM modulation pre-emphasis is done for

A. high frequency components
B. low frequency components
C. middle frequency components
D. both (a) and (b)

Answer: Option A

Explanation:

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4. 

c(t) and m(t) are used to generate an AM signal. The modulation index of the generated AM signal is 0.5 then the quantity
is

A. 1/2
B. 1/4
C. 1/3
D. 1/8

Answer: Option D

Explanation:

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5. 

High intermediate frequency in a superheterodyne receiver

A. higher than
B. lower than
C. equal to
D. not comparable to

Answer: Option A

Explanation:

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