Power Electronics MCQs with answers Page - 16

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. Under harmonic free load voltages, the 3 phase VSI

  • (A) Does not contains second harmonic
  • (B) Does not contains third harmonic
  • (C) Does not contains fifth harmonic
  • (D) Does not contains seventh harmonic

A

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Q. A fully controlled converter uses

  • (A) diodes only
  • (B) thyristors only
  • (C) both diodes and thyristors
  • (D) none of the mentioned

A

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Q. In a B-2 type full controlled bridge converter

  • (A) one SCR conducts at a time
  • (B) two SCRs conduct at a time
  • (C) three SCRs conduct at a time
  • (D) four SCRs conduct at a time

A

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Q. In a step down chopper, if Vs = 100 V and the chopper is operated at a duty cycle of 75 %. Find the output voltage.

  • (A) 100 V
  • (B) 75 V
  • (C) 25 V
  • (D) none of the mentioned

A

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Q. Find the expression for output voltage for a step-up chopper, assume linear variation of load current and α as the duty cycle.

  • (A) Vs
  • (B) Vs/α
  • (C) Vs/(1-α)
  • (D) Vs/√2

A

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Q. Find the output voltage for a step-up chopper when it is operated at a duty cycle of 50 % and Vs = 240 V.

  • (A) 240 V
  • (B) 480 V
  • (C) 560 V
  • (D) 120 V

A

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Q. In the method of phase control, the phase relationship between ___ & ___ is controlled by varying the firing angle

  • (A) supply current, supply voltage
  • (B) end of the load current, end of the load voltage
  • (C) start of the load current, start of the load voltage
  • (D) load current, load voltage

A

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Q. In a single phase half-wave thyristor circuit with R load & Vs=Vm sinωt, the maximum value of the load current can be given by

  • (A) 2Vm/R
  • (B) Vs/R
  • (C) Vm/2
  • (D) Vs/2

A

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Q. A single-phase half-wave thyristor circuit with R load is triggered at an angle of α = 0°. As such, the maximum value of the average output voltage would be given by Consider Vs = Vm sinωt.

  • (A) Vm
  • (B) 2Vm/π
  • (C) Vm/π
  • (D) Vm/α

A

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Q. The AC voltage controllers are used in __________ applications.

  • (A) power generation
  • (B) electric heating
  • (C) conveyor belt motion
  • (D) power transmission

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