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
2
4
3
5
Answer: Option
Explanation:

24 = 16.


2.
When modulation index of an AM wave is increased from 0.5 to 1, the transmitted power
remains the same
increases by 25%
increases by 33.3%
increases by 50%
Answer: Option
Explanation:

.


3.
Quantizing error occurs in
TDM
FDM
PCM
PWD
Answer: Option
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
5 mm
2.5 mm
1.5 mm
1 mm
Answer: Option
Explanation:

Each track is 2.5 mm wide.


5.
The most commonly used transistor amplifier circuit is
CB
CC
CE
CE or CC
Answer: Option
Explanation:

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