Electronics and Communication Engineering - Communication Systems

1. 

A total of 16 equally probable events exist. If it is required to select one out of them, the number of required bits is

A. 2
B. 4
C. 3
D. 5

Answer: Option B

Explanation:

24 = 16.


2. 

When modulation index of an AM wave is increased from 0.5 to 1, the transmitted power

A. remains the same
B. increases by 25%
C. increases by 33.3%
D. increases by 50%

Answer: Option C

Explanation:

.


3. 

Quantizing error occurs in

A. TDM
B. FDM
C. PCM
D. PWD

Answer: Option C

Explanation:

An analog number cannot be converted into an exact digital number.

This is called quantizing error.


4. 

In audio cassettes the width of each recording track is

A. 5 mm
B. 2.5 mm
C. 1.5 mm
D. 1 mm

Answer: Option B

Explanation:

Each track is 2.5 mm wide.


5. 

The most commonly used transistor amplifier circuit is

A. CB
B. CC
C. CE
D. CE or CC

Answer: Option C

Explanation:

Common emitter connection has high power gain, and good current and voltage gains.


1 2 3 4 5 6 7 8 9 10 Next »