Electronic Devices and Circuits MCQs with answers Page - 19

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Q. A class C amplifier has a tank circuit in the output. The amplifier is conducting only 28°. The output voltage is

  • (A) 0 v.
  • (B) a dc value equal to vcc.
  • (C) a sine wave.
  • (D) a square wave with a frequency determined by the tank.

A

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Q. In practice, the efficiency of a capacitively coupled class A amplifier is about %.

  • (A) 25
  • (B) 40
  • (C) 70
  • (D) 10

A

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Q. The Q-point is at cutoff for class operation.

  • (A) a
  • (B) b
  • (C) c
  • (D) ab

A

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Q. Class amplifiers are normally operated in a push-pull configuration in order to produce an output that is a replica of the input.

  • (A) a
  • (B) b
  • (C) c
  • (D) ab

A

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Q. The maximum efficiency of a class B amplifier is percent.

  • (A) 50
  • (B) 25
  • (C) 70
  • (D) 79

A

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Q. A class amplifier is biased slightly above cutoff and operates in the linear region for slightly more than 180º of the input cycle.

  • (A) a
  • (B) b
  • (C) c
  • (D) ab

A

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Q. Which class of amplifier operates in the linear region for only a small part of the input cycle?

  • (A) a
  • (B) b
  • (C) c
  • (D) ab

A

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Q. The principal advantage(s) of MOSFETs over BJTs is (are)

  • (A) their biasing networks are simpler.
  • (B) their drive requirements are simpler.
  • (C) they can be connected in parallel for added drive capability.
  • (D) all of the above

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Q. The principal advantage(s) of BJTs over MOSFETs is (are) that

  • (A) voltage drop across the transistor is important.
  • (B) they are not as prone to esd.
  • (C) both of the above
  • (D) none of the above

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Q. The class amplifier is biased below cutoff.

  • (A) a
  • (B) ab
  • (C) b
  • (D) c

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