Amplifiers With Negative Feedback MCQs with answers Page - 1

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A

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Q. A feedback circuit usually employsnetwork

  • (A) Resistive
  • (B) Capacitive
  • (C) Inductive
  • (D) None of the above

A

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Q. An emitter follower hasinput impedance

  • (A) Zero
  • (B) Low
  • (C) High
  • (D) None of the above

A

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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

A

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Q. Emitter follower is used for _________.

  • (A) Current gain
  • (B) Impedance matching
  • (C) Voltage gain
  • (D) None of the above

A

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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

A

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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

A

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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

A

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Q. Negative feedback is employed in _______

  • (A) Oscillators
  • (B) Rectifiers
  • (C) Amplifiers
  • (D) None of the above

A

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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

A

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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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