Amplifiers – 1 – 5

21. If the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, then feedback fraction is …….

(a) 10
(b) 0.1
(c) 0.01
(d) 0.15

ANSWER

EXPLANATION

22. The gain of an amplifier without feedback is 100 db. If a negative feedback of 3 db is applied, the gain of the amplifier will become ……..

(a) 101.5 db
(b) 300 db
(c) 103 db
(d) 97 db

ANSWER

EXPLANATION

23. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative voltage feedback is approximately …….

(a) 500
(b) 100
(c) 1000
(d) 5000

ANSWER

EXPLANATION

24. A feedback circuit usually employs ………. network.

(a) resistive
(b) capacitive
(c) inductive
(d) none of the above

ANSWER

EXPLANATION

25. The gain of an amplifier with feedback is known as ……….. gain.

(a) resonant
(b) open loop
(c) closed loop
(d) none of the above

ANSWER

EXPLANATION

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