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Free download in PDF Amplifiers with Negative Feedback General Knowledge Multiple Choice Questions(MCQs) & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
The output impedance of an emitter follower is ……….
[A]
High
[B]
Very high
[C]
Almost zero
[D]
Low
(2)
An emitter follower has ………… input impedance
[A]
Zero
[B]
Low
[C]
High
[D]
None of the above
(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
(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
(5)
Emitter follower is a ……………….. circuit
[A]
Voltage feedback
[B]
Current feedback
[C]
Both voltage and current feedback
[D]
None of the above
(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
(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
(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
(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
(13)
A feedback circuit usually employs ……………… network
[A]
Capacitive
[B]
Resistive
[C]
Inductive
[D]
None of the above
(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
(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
(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
(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
(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
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