Electronic Devices and Circuits MCQs with answers Page - 20

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A

Admin • 833.24K Points
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Q. For Class-B operation, the collector current flows for

  • (A) the whole cycle
  • (B) half the cycle
  • (C) less than half a cycle
  • (D) less than a quarter of a cycle

A

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Q. Transformer coupling is an example of

  • (A) direct coupling
  • (B) ac coupling
  • (C) dc coupling
  • (D) impedance coupling

A

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Q. Class-C amplifiers are almost always

  • (A) transformer- coupled between stages
  • (B) operated at audio frequencies
  • (C) tuned rf amplifiers
  • (D) wideband

A

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Q. Heat sinks reduce the

  • (A) transistor power
  • (B) ambient temperature
  • (C) junction temperature
  • (D) collector current

A

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Q. Which type of power amplifier is biased for operation at less than 180º of the cycle?

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

A

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Q. What is the maximum efficiency of a class A circuit with a direct or series-fed load connection?

  • (A) 90%
  • (B) 78.50%
  • (C) 50%
  • (D) 25%

A

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Q. Which of the following is (are) power amplifiers?

  • (A) class a
  • (B) class b or ab
  • (C) class c or d
  • (D) all of the above

A

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Q. What is the maximum collector efficiency of a transformer coupled class A power amplifier?

  • (A) 30%
  • (B) 80%
  • (C) 45%
  • (D) 50%

A

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Q. Class C amplifiers are used as

  • (A) af amplifiers
  • (B) small signal amplifiers
  • (C) rf amplifiers
  • (D) if amplifiers

A

Admin • 833.24K Points
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Q. Find the voltage drop developed across a D’ Arsonval meter movement having an internal resistance of 1 kΩ and a full deflection current of 150uA.

  • (A) 150 µv
  • (B) 150 mv
  • (C) 150 v
  • (D) 200 mv

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