Feedback Amplifier - Questions & Answers | Exam2Win

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1. In a degenerative feedback amplifier the phase difference between the input signal and feedback signal is

A. 180°

B. 90°

C. 0°

D. 360°

Explanation:

2. The voltage amplification factor of an amplifier without feedback is 20. When a positive feedback is given with a feedback fraction of 0.01, the gain with feedback is

A. 30

B. 25

C. 20

D. 16.7

Explanation:

3. In amplifier, the feedback is positive if

A. the input of the amplifier is ahead of the voltage fed back by a phase angle of π/4

B. the input of the amplifier is ahead of the voltage fed back by a phase difference of π/2

C. the voltage fed back to the input circuit is in phase with the signal voltage

D. the output of the amplifier is exactly in phase with the voltage fed back to the input

Explanation:

4. The overall gain of a multistage amplifier is 140. When negative feedback is applied, the gain is reduced to 17.5. Then the feedback ratio is

A. 1/10

B. 1/15

C. 1/5

D. 1/20

Explanation:

5. In a feedback amplifier, if the feedback fraction β is positive, then the feedback is

A. degenerative

B. regenerative

C. negative

D. reverse

Explanation:

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