Electronic Devices and Circuits MCQs with answers Page - 16

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Q. The current gain of an emitter follower is

  • (A) equal to 1
  • (B) greater than 1
  • (C) less than 1
  • (D) zero

A

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Q. The current in any branch of a transistor amplifier that is operating is

  • (A) ac only
  • (B) the sum of ac and dc
  • (C) the difference of ac and dc
  • (D) dc only

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Q. An ideal differential amplifiers common mode rejection ratio is

  • (A) infinite
  • (B) zero
  • (C) unity
  • (D) undetermined

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Q. An open fuse circuit has a resistance equal to

  • (A) zero
  • (B) unity
  • (C) at least 100Ω at standard
  • (D) infinity

A

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Q. What is the purpose of dc conditions in a transistor?

  • (A) to reverse bias the emitter
  • (B) to forward bias the emitter
  • (C) to set up operating point
  • (D) to turn on the transistor

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Q. The ac variations at the output side of power supply circuits are called .

  • (A) ripples
  • (B) pulses
  • (C) waves
  • (D) filters

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Q. What is the purpose of the emitter capacitor?

  • (A) to forward bias the emitter
  • (B) to reduce noise in the amplifier
  • (C) to avoid drop in gain
  • (D) to stabilize emitter voltage

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Q. A common emitter circuit is also called circuit.

  • (A) grounded emitter
  • (B) grounded collector
  • (C) grounded base
  • (D) emitter follower

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Q. The output signal of a common-collector amplifier is always

  • (A) larger than the input signal
  • (B) in phase with the input signal
  • (C) out of phase with the input signal
  • (D) exactly equal to the input signal

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Q. Calculate the ripples of the filter output if a dc and ac voltmeter is used and measures the output signal from a filter circuit of 25 VDC and 1.5 Vrms

  • (A) 5%
  • (B) 10%
  • (C) 50%
  • (D) 6%

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