Power Electronics MCQs with answers Page - 4

Here, you will find a collection of MCQ questions on Power Electronics. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. In a 3 phase bridge rectifier the ripple frequency is

  • (A) Equal to the input frequency
  • (B) Twice the input frequency
  • (C) Three times the input frequency
  • (D) Six times the input frequency

A

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Q. DIAC are specifically designed to trigger

  • (A) TRIAC
  • (B) SCR
  • (C) GTO
  • (D) Only (a) and (b)

A

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Q. As the breakdown voltage reached, the DIAC exhibits

  • (A) Negative resistance characteristics
  • (B) Goes into avalanche condition
  • (C) Voltage drop snaps back
  • (D) All of these

A

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Q. In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes

  • (A) Do not contribute to the collector current
  • (B) Result in net current flow component into the base
  • (C) Contribute to the collector current
  • (D) Only (a) and (b)

A

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Q. In BJT, switching losses occurs

  • (A) Only at turn - on
  • (B) Only at turn - off
  • (C) Both at turn on and off
  • (D) None of these

A

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Q. Choppers is a

  • (A) AC - DC converters
  • (B) AC - AC converters
  • (C) DC - AC converters
  • (D) DC - DC converters

A

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Q. The average value of the output voltage in a step - down dc chopper is given by

  • (A) V 0 = V s
  • (B) V 0 = D V s
  • (C) V 0 = V s / D
  • (D) V 0 = V s / ( 1 - D )

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Q. The voltage will be

  • (A) 230 V
  • (B) 250 V
  • (C) 275 V
  • (D) 325 V

A

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Q. The dc current will be approximately

  • (A) 2.5 A
  • (B) 3 A
  • (C) 3.25 A
  • (D) 3.75 A.

A

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Q. The ac input current at slip rings will be

  • (A) 6.3 A
  • (B) 5.8 A
  • (C) 4.1A
  • (D) 3.8 A.

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