Power Electronics MCQs with answers Page - 10

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 integral cycle control the period of on-off control should be more than mechanical time constant of load.

  • (A) True
  • (B) False
  • (C) none
  • (D) all

A

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Q. A single phase half wave converter is feeding a resistive load. Just before triggering, the voltage across thyristor is

  • (A) Zero
  • (B) about 1 V
  • (C) same as input voltage
  • (D) twice the input voltage

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Q. In a 3 phase full wave regulator feeding resistance load connected in star, the possible range of firing angle a is

  • (A) 0 ≤  ≤ 180°
  • (B) 0 ≤  ≤ 150°
  • (C) 0 ≤  ≤ 120°
  • (D) 0 ≤  ≤ 90°

A

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Q. A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 Ω per phase. The peak value of load current is

  • (A) 40 A
  • (B) 20 A
  • (C) 10 A
  • (D) 5 A

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Q. In an SCR, the anode current is controlled by

  • (A) gate current only
  • (B) external circuit only
  • (C) both gate current and external circuit
  • (D) none of the above

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Q. The rated current of a thyristor is 40 A. The holding current will be about :

  • (A) 20 A
  • (B) 1 A
  • (C) 100 mA
  • (D) 10 mA

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Q. The number of leads in a power semiconductor diode are

  • (A) 2
  • (B) 3
  • (C) 4
  • (D) 2 or 3

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Q. If ton and toff are the turn on and turn off times of a thyristor, then

  • (A) ton and toff are almost equal
  • (B) ton >> toff
  • (C) toff >> ton
  • (D) ton is about twice toff

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Q. UJT can be used for

  • (A) firing an SCR
  • (B) turning off an SCR
  • (C) both firing and turning off an SCR
  • (D) none of the above

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Q. The gate current required to turn on an SCR is

  • (A) few amperes
  • (B) a few mA
  • (C) almost equal to anode current
  • (D) about 50% of anode current

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