Power Electronics MCQs with answers Page - 23

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. A semiconverter feeding an RLE load operates in

  • (A) first quadrant only
  • (B) first and second quadrants
  • (C) first and fourth quadrants
  • (D) first and third quadrants

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Q. The phenomenon of overlap in converter operation due to

  • (A) source resistance
  • (B) source inductance
  • (C) both source resistance and source inductance
  • (D) high value of firing angle

A

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Q. An SCR is triggered at 40° in the positive half cycle only. The average anode current is 50 A. If the firing angle is changed to 80°, the average anode current is likely to be

  • (A) 50 A
  • (B) 25 A
  • (C) less than 50 A but more than 25 A
  • (D) less than 25 A

A

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Q. In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally

  • (A) Equal
  • (B) Different
  • (C) equal or different
  • (D) different but sometimes equal

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Q. Current derating may be necessary when thyristors are operating in

  • (A) Series
  • (B) Parallel
  • (C) series or parallel
  • (D) none of the above

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Q. A 3 kV circuit uses SCR of 800 V rating. If derating is 25%, the number of SCRs in series is

  • (A) 4
  • (B) 5
  • (C) 6
  • (D) 8

A

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Q. The terminals of a power MOSFET are called

  • (A) emitter, base, collector
  • (B) source, gate, drain
  • (C) source, base, drain
  • (D) emitter, gate, drain

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Q. In a thyristor the gate current is increased, then

  • (A) anode current will increase
  • (B) anode current will decrease
  • (C) anode current will remain constant
  • (D) anode current may increase or decrease

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Q. Thyristors are not suitable for logic circuits.

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

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Q. The number of leads in an SCR are :

  • (A) 2
  • (B) 3
  • (C) 4
  • (D) 5

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