Amplifiers with Negative Feedback MCQs | Page - 1

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Tutor I

Q. A feedback circuit usually employsnetwork

(A) Resistive
(B) Capacitive
(C) Inductive
(D) None of the above
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Q. An emitter follower hasinput impedance

(A) Zero
(B) Low
(C) High
(D) None of the above
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Q. Emitter follower is acircuit

(A) Voltage feedback
(B) Current feedback
(C) Both voltage and current feedback
(D) None of the above
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Q. Emitter follower is used for _________.

(A) Current gain
(B) Impedance matching
(C) Voltage gain
(D) None of the above
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Q. 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
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Tutor I

Q. 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) 0.1
(C) 15
(D) 20
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Q. 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
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Q. Negative feedback is employed in _______

(A) Oscillators
(B) Rectifiers
(C) Amplifiers
(D) None of the above
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Q. The gain of an amplifier with feedback is known as gain

(A) Resonant
(B) Open loop
(C) Closed loop
(D) None of the above
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Q. 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
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