Power Electronics MCQs with answers Page - 6

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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A

Admin • 828.03K Points
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Q. A chopper is a

  • (A) Time ratio controller
  • (B) AC to DC converter
  • (C) DC transformer
  • (D) High speed semiconductor switch

A

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Q. What is the duty cycle of a chopper ?

  • (A) Ton/Toff
  • (B) Ton/T
  • (C) T/Ton
  • (D) Toff x Ton

A

Admin • 828.03K Points
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Q. The load voltage of a chopper can be controlled by varying the

  • (A) duty cycle
  • (B) firing angle
  • (C) reactor position
  • (D) extinction angle

A

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Q. The values of duty cycle (α) lies between

  • (A) 0<α<1
  • (B) 0>α>-1
  • (C) 0<=α<=1
  • (D) 1<α<100

A

Admin • 828.03K Points
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Q. If T is the time period for a chopper circuit and α is its duty cycle, then the chopping frequency is

  • (A) Ton/α
  • (B) Toff/α
  • (C) α/Toff
  • (D) α/Ton

A

Admin • 828.03K Points
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Q. AC voltage controllers convert

  • (A) Fixed ac to fixed dc
  • (B) Variable ac to variable dc
  • (C) Fixed ac to variable ac
  • (D) Variable ac to fixed ac

A

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Q. In AC voltage controllers the

  • (A) variable ac with fixed frequency is obtained
  • (B) variable ac with variable frequency is obtained
  • (C) variable dc with fixed frequency is obtained
  • (D) variable dc with variable frequency is obtained

A

Admin • 828.03K Points
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Q. The GTO (gate turn-off thyristor) is a

  • (A) p-n-p-n device
  • (B) p-n-p device
  • (C) p-metal-n device
  • (D) p-n single junction device

A

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Q. The GTO can be turned off

  • (A) by a positive gate pulse
  • (B) by a negative gate pulse
  • (C) by a negative anode-cathode voltage
  • (D) by removing the gate pulse

A

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Q. In GTO The anode current is ideally limited by the

  • (A) gate pulse amplitude
  • (B) internal impedance of the device
  • (C) load Impedance
  • (D) gate circuit impedance

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