300+ TOP Amplifiers with Negative Feedback MCQs and Answers

Amplifiers with Negative Feedback Questions with Answers :-

1. When negative voltage feedback is applied to an amplifier, its voltage gain ……………….

1. Is increased
2. Is reduced
3. Remains the same
4. None of the above
   Ansr : 2

2. The value of negative feedback fraction is always …………….

1. Less than 1
2. More than 1
3. Equal to 1
4. None of the above
   Ansr : 1

3. 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 ………..

1. 10
2. 1
3. 01
4. 15
   Ansr : 3

4. 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 …………..

1. 5 db
2. 300 db
3. 103 db
4. 97 db
   Ansr : 4

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

1. 500
2. 100
3. 1000
4. 5000
   Ansr : 2

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

Resistive
Capacitive
Inductive
None of the above
Ansr : 1

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

Resonant
Open loop
Closed loop
None of the above
Ansr : 3

8. When voltage feedback (negative) is applied to an amplifier, its input impedance ………….

Is decreased
Is increased
Remains the same
None of the above
Ansr : 2

9. When current feedback (negative) is applied to an amplifier, its input impedance …………..

Is decreased
Is increased
Remains the same
None of the above
Ansr : 1

10. Negative feedback is employed in ……………..

Oscillators
Rectifiers
Amplifiers
None of the above
Ansr : 3

11. Emitter follower is used for …………

Current gain
Impedance matching
Voltage gain
None of the above
Ansr : 2

12. The voltage gain of an emitter follower is ………..

Much less than 1
Approximately equal to 1
Greater than 1
None of the above
Ansr : 2

13. When current feedback (negative) is applied to an amplifier, its output impedance ……..

Is increased
Is decreased
Remains the same
None of the above
Ansr : 1

14. Emitter follower is a ……………….. circuit

Voltage feedback
Current feedback
Both voltage and current feedback
None of the above
Ansr : 1

15. If voltage feedback (negative) is applied to an amplifier, its output impedance …………..

Remains the same
Is increased
Is decreased
None of the above
Ansr : 3

16. When a negative voltage feedback is applied to an amplifier, its bandwidth……….

1. Is increased
2. Is decreased
3. Remains the same
4. Insufficient data
   Ansr : 1

17. An emitter follower has ………… input impedance

1. Zero
2. Low
3. High
4. None of the above
   Ansr : 3

19. The output impedance of an emitter follower is ……….

1. High
2. Very high
3. Almost zero
4. Low
   Ansr : 4

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