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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 2
21.
Which of the following power amplifiers has highest efficiency?
Class A
Class AB
Class B
Class C
Answer: Option
Explanation:

Class C has more efficiency than all other classes.

22.
A full wave rectifier using centre tapped transformer and a bridge rectifier use similar diodes and have equal no load output voltage. Under equal load conditions
Output voltage of bridge rectifier
Output voltage of bridge rectifier will be more than that of other
Output voltage of both will be exactly equal
Output voltage of any one may be more than that of other
Answer: Option
Explanation:

Since two diodes are in series bridge rectifier, voltage drop is more.

23.
Assume that op-amp in figure is ideal. If input Vi is triangular, the output V0 will be
square wave
sine wave
triangular wave
parabolic wave
Answer: Option
Explanation:

It is a differentiating amplifier.

24.
In an amplifier with a gain of - 1000 and feedback factor β = - 0.1, the change in gain is 20% due to temperature. The change in gain for feedback amplifier will be
10%
5%
0.2%
0.01%
Answer: Option
Explanation:

. When gain changes,

age change in

25.
In the diode circuit of figure the diodes are ideal. The average current through ammeter is
Answer: Option
Explanation:

.

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