Electronics and Communication Engineering - Communication Systems

1. 

For an ideal 3000 Hz channel, S/N ratio is

A. 3
B. 1.5
C. 4
D. 2

Answer: Option A

Explanation:

= 26000/3000 - 1 = 3.


2. 

Which of the following types of noise assumes greater importance at high frequencies?

A. Transit time noise
B. Shot noise
C. Impulse noise
D. Random noise

Answer: Option A

Explanation:

At high frequencies time period of wave and transit time become comparable.


3. 

In transistor radio receivers the number of IF amplifier stages are

A. 1
B. 2
C. 4
D. 6

Answer: Option B

Explanation:

Two IF amplifier stages are very commonly used.


4. 

To relay outdoor remotely located live programs, TV transmitter use

A. microwave links
B. coaxial cable link
C. open wire link
D. either (b) or (c)

Answer: Option A

Explanation:

Microwave links are used.


5. 

If each short element of signal occupies 20 ms, the speed is

A. 20 bauds
B. 50 bauds
C. bauds
D. 0.05 bauds

Answer: Option B

Explanation:

.


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