Amplifiers – Exercise – 1

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
Answer : (c)
Explanation
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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
Answer : (d)
Explanation
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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
Answer : (b)
Explanation
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24. A feedback circuit usually employs ………. network.

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

Answer
Answer : (a)
Explanation
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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
Answer : (c)
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