Electronic Devices and Circuits MCQs with answers Page - 14

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Q. The maximum efficiency of resistance loaded class A power amplifier is

  • (A) 5%
  • (B) 50%
  • (C) 30%
  • (D) 25%

A

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Q. Class power amplifier has the highest collector efficiency

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

A

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Q. Power amplifiers handle signals compare to voltage amplifiers.

  • (A) small
  • (B) very small
  • (C) large
  • (D) none of the above

A

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Q. In class B operation, at what fraction of VCC should the level of VL(p) be to achieve the maximum power dissipated by the output transistor?

  • (A) 0.5
  • (B) 0.636
  • (C) 0.707
  • (D) 1

A

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Q. In class A operation, the operating point is generally located of the d.c. load line.

  • (A) at cut off point
  • (B) at the middle
  • (C) at saturation point
  • (D) none of the above

A

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Q. The output transformer used in a power amplifier is a transformer.

  • (A) 1:1 ratio
  • (B) step-up
  • (C) step-down
  • (D) none of the above

A

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Q. Power amplifiers primarily provide sufficient power to an output load, typically from to .

  • (A) a few kw, tens of kw
  • (B) 500 w, 1 kw
  • (C) 100 w, 500 w
  • (D) a few w, tens of w

A

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Q. The main feature(s) of a large-signal amplifier is (are) the .

  • (A) circuits power efficiency
  • (B) maximum amount of power that the circuit is capable of handling
  • (C) impedance matching to the output
  • (D) all of the above

A

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Q. In power amplifiers, the output signal varies for a full 360º of the cycle.

  • (A) class a
  • (B) class b or ab
  • (C) class c
  • (D) class d

A

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Q. In class B power amplifiers, the output signal varies for of the cycle.

  • (A) 360º
  • (B) 180º
  • (C) between 180º and 360º
  • (D) less than 180º

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