Amplifiers with Negative Feedback General Knowledge Multiple Choice Questions(MCQs) & Answers | Amplifiers with Negative Feedback General Knowledge Quiz

Questions

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

A High

B Very high

C Almost zero

D Low

View Answer

Answer: Low

2 An emitter follower has ………… input impedance

A Zero

B Low

C High

D None of the above

View Answer

Answer: High

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

A Is increased

B Insufficient data

C Is decreased

D Remains the same

View Answer

Answer: Is increased

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

A Remains the same

B Is increased

C Is decreased

D None of the above

View Answer

Answer: Is decreased

5 Emitter follower is a ……………….. circuit

A Voltage feedback

B Current feedback

C Both voltage and current feedback

D None of the above

View Answer

Answer: Current feedback

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

A Is increasedIs increased

B Is decreased

C Remains the same

D None of the above

View Answer

Answer: Is increasedIs increased

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

A Much less than 1

B Approximately equal to 1

C Greater than 1

D None of the above

View Answer

Answer: Approximately equal to 1

8 Emitter follower is used for …………

A Current gain

B Impedance matching

C Voltage gain

D None of the above

View Answer

Answer: Impedance matching

9 Negative feedback is employed in ……………..

A Amplifiers

B Rectifiers

C Oscillators

D None of the above

View Answer

Answer: Amplifiers

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

A Remains the same

B Is decreased

C Is increased

D None of the above

View Answer

Answer: Is decreased

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

A Is increased

B Is decreased

C Remains the same

D None of the above

View Answer

Answer: Is increased

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

A Resonant

B Open loop

C Closed loop

D None of the above

View Answer

Answer: Closed loop

13 A feedback circuit usually employs ……………… network

A Capacitive

B Resistive

C Inductive

D None of the above

View Answer

Answer: Resistive

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

A 500

B 100

C 1000

D 5000

View Answer

Answer: 100

15 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 5 db

B 300 db

C 103 db

D 97 db

View Answer

Answer: 97 db

16 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 1

C 01

D 15

View Answer

Answer: 01

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

A Less than 1

B More than 1

C Equal to 1

D None of the above

View Answer

Answer: Less than 1

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

A Is increased

B Is reduced

C Remains the same

D None of the above

View Answer

Answer: Is reduced

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