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

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Questions
1 The output impedance of an emitter follower is ……….
A High
B Very high
C Almost zero
D Low

Answer: Low
2 An emitter follower has ………… input impedance
A Zero
B Low
C High
D None of the above

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

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

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

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

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

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

Answer: Impedance matching
9 Negative feedback is employed in ……………..
A Amplifiers
B Rectifiers
C Oscillators
D None of the above

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

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

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

Answer: Closed loop
13 A feedback circuit usually employs ……………… network
A Capacitive
B Resistive
C Inductive
D None of the above

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

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

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

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

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

Answer: Is reduced

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