Power Electronics MCQs with answers Page - 11

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 single phase half wave converter is used to charge a battery of 50 V. The thyristor is continuously fired by dc signal. Input voltage is v = Vm sin ωt. The thyristor will conduct

  • (A) from 0 to 180°
  • (B) when v > 50 V
  • (C) from 0 to 90°
  • (D) When v < 50 V

A

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Q. In a 3 phase semiconverter, the firing frequency is

  • (A) equal to line frequency
  • (B) 3 times the line frequency
  • (C) 6 times the line frequency
  • (D) 12 times the line frequency

A

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Q. A thyristor has its gate current zero. To start conduction the forward voltage must exceed

  • (A) about 0.5 V
  • (B) forward breakover voltage
  • (C) on state voltage
  • (D) peak working off state forward voltage

A

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Q. On load tap changer using thyristors can have a maximum of two taps.

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

A

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Q. In a single phase full wave ac regulator, the firing angles in the two half cycles

  • (A) are always equal
  • (B) are sometimes equal
  • (C) are never equal
  • (D) may be equal or unequal

A

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Q. As regards single phase dual converter

  • (A) the change in operation from one quadrant to the other is faster in non-circulating current mode
  • (B) the change in operation from one quadrant to the other is faster in circulating current mode
  • (C) the time response to change in operation from one quadrant to other is the same in both the modes
  • (D) the time response to change in operation from one quadrant to the other may be faster in any of the two modes

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Q. To protect an SCR against high di/dt we connect

  • (A) a capacitance in series with SCR
  • (B) a capacitance in parallel with SCR
  • (C) an inductance in parallel with SCR
  • (D) an inductance in series with SCR

A

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Q. In a parallel inverter

  • (A) the commutating capacitor C is across the primary of transformer and the load is across the secondary
  • (B) the commutating capacitor and load are connected across the secondary of transformer
  • (C) the commutating capacitor C and load are connected in series and the combination is across the secondary of transformer
  • (D) none of the above

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Q. A single phase fully controlled bridge rectifier is fed by a source having inductance. The output voltage during overlap period is

  • (A) Vm
  • (B) 0.5 Vm
  • (C) zero
  • (D) 0.5 Vm - voltage drop across inductance

A

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Q. Which of these commutation methods is used in AC-DC converters?

  • (A) Class A
  • (B) Class C
  • (C) Class D
  • (D) Class F

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