Electronics and Communication Engineering - Communication Systems

1. 

Transit time is considered as significant at

A. HF
B. MF
C. LF
D. all of the above

Answer: Option D

Explanation:

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2. 

In a colour TV receiver, AGC adjusts the gain of

A. RF stage only
B. IF stage only
C. RF stage and one or two IF stages
D. none of the above

Answer: Option C

Explanation:

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3. 

In pulse transmitter the ratio of time on to time off is called

A. efficiency
B. duty cycle
C. base
D. bandwidth

Answer: Option B

Explanation:

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4. 

In figure the output v(t) is

A. phase modulated signal
B. amplitude modulated signal
C. frequency modulated signal
D. none of the above

Answer: Option C

Explanation:

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5. 

A MASER is a

A. low noise device
B. high noise device
C. medium noise device
D. may be either high or medium noise device

Answer: Option A

Explanation:

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