Amplifiers with Negative Feedback Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Amplifiers with Negative Feedback ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Amplifiers with Negative Feedback comprehensively.

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2.
When negative voltage feedback is applied to an amplifier, its voltage gain ____________?

Is increased

Is reduced

Remains the same

None of the above

3.
The value of negative feedback fraction is always _______________?

Less than 1

More than 1

Equal to 1

None of the above

4.
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_____________?

10

1

01

15

5.
The gain of an amplifier with feedback is known as____________gain?

Resonant

Open loop

Closed loop

None of the above

6.
If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately________________?

500

100

1000

5000

7.
When current feedback (negative) is applied to an amplifier, its input impedance _____________?

Is decreased

Is increased

Remains the same

None of the above

8.
A feedback circuit usually employs _________________ network?

Resistive

Capacitive

Inductive

None of the above

9.
Negative feedback is employed in __________________?

Oscillators

Rectifiers

Amplifiers

None of the above

10.
When current feedback (negative) is applied to an amplifier, its output impedance ________________?

Is increased

Is decreased

Remains the same

None of the above

11.
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______________?

5 db

300 db

103 db

97 db

12.
Emitter follower is used for ________________?

Current gain

Impedance matching

Voltage gain

None of the above

13.
The voltage gain of an emitter follower is _____________?

Much less than 1

Approximately equal to 1

Greater than 1

None of the above

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

Remains the same

Is increased

Is decreased

None of the above

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