amplifiers with negative feedback Mcqs
1. The voltage gain of an emitter follower is _____________?
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A. Approximately equal to 1

B. Greater than 1

C. None of the above

D. Much less than 1

2. The gain of an amplifier with feedback is known as____________gain?
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A. Open loop

B. None of the above

C. Closed loop

D. Resonant

3. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately________________?
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A. 5000

B. 1000

C. 100

D. 500

4. Negative feedback is employed in __________________?
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A. Rectifiers

B. None of the above

C. Oscillators

D. Amplifiers
5. The output impedance of an emitter follower is______________?
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A. Almost zero

B. Very high

C. Low

D. High

6. When current feedback (negative) is applied to an amplifier, its output impedance ________________?
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A. Remains the same

B. None of the above

C. Is increased

D. Is decreased

7. When negative voltage feedback is applied to an amplifier, its voltage gain ____________?
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A. Is increased

B. Is reduced

C. Remains the same

D. None of the above

8. A feedback circuit usually employs _________________ network?
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A. None of the above

B. Capacitive

C. Resistive

D. Inductive

9. When voltage feedback (negative) is applied to an amplifier, its input impedance _______________?
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A. Is decreased

B. Is increased

C. Remains the same

D. None of the above

10. When a negative voltage feedback is applied to an amplifier, its bandwidth_____________?
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A. Is increased

B. Insufficient data

C. Is decreased

D. Remains the same

11. 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_____________?
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A. 10

B. 1

C. 01

D. 15

12. The value of negative feedback fraction is always _______________?
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A. More than 1

B. None of the above

C. Less than 1

D. Equal to 1

13. Emitter follower is a _______________circuit?
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A. Voltage feedback

B. Current feedback

C. Both voltage and current feedback

D. None of the above

14. If voltage feedback (negative) is applied to an amplifier, its output impedance ______________?
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A. Is decreased

B. Remains the same

C. Is increased

D. None of the above

15. When current feedback (negative) is applied to an amplifier, its input impedance _____________?
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A. None of the above

B. Is decreased

C. Is increased

D. Remains the same

16. 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______________?
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A. 103 db

B. 300 db

C. 5 db

D. 97 db</strong>

17. Emitter follower is used for ________________?
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A. None of the above

B. Voltage gain

C. Impedance matching

D. Current gain

18. An emitter follower has ______________input impedance?
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A. None of the above

B. High

C. Zero

D. Low

19. Emitter follower is used for________________?
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A. Current gain

B. Voltage gain

C. Impedance matching

D. None of the above