Power Electronics MCQs with answers Page - 22

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Q. The most suited gate pulses given to the AC regulator with R – L load can be in the form of

  • (A) Continuous signal
  • (B) Large isolating pulse transformer
  • (C) A train of pulses
  • (D) None of these

A

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Q. With increase in firing angle,

  • (A) Both harmonic distortion and quality of input current increases
  • (B) Harmonic distortion increases and quality of input current decreases
  • (C) Harmonic distortion decreases and quality of input current increases
  • (D) Both harmonic distortion and quality of input current decreases

A

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Q. The power MOSFET device is a

  • (A) Current controlled unipolar device
  • (B) Voltage controlled unipolar device
  • (C) Current controlled bipolar device
  • (D) Voltage controlled bipolar device

A

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Q. In a full wave converter (M - 2 connection) feeding an RLE load, the peak thyristor current is 15 A. For fully controlled bridge circuit and same load current, the peak thyristor current will be

  • (A) 30 A
  • (B) 152 A
  • (C) 15 A
  • (D) none

A

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Q. During forward blocking state of SCR, the voltage and current respectively are

  • (A) high and high
  • (B) low and low
  • (C) high and low
  • (D) low and high

A

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Q. In a 3 phase full converter the average load current is 150 A. The average thyristor current is

  • (A) 150 A
  • (B) 75A
  • (C) 50 A
  • (D) 25 A

A

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Q. The two modes of operation of three phase bridge inverters are known as

  • (A) 60° mode and 120° mode
  • (B) 90° mode and 120° mode
  • (C) 120° mode and 180° mode
  • (D) 120° mode and 240° mode

A

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Q. In a 3 phase fully controlled converter the firing frequency is

  • (A) 3 times the line frequency
  • (B) 6 times the line frequency
  • (C) 9 times the line frequency
  • (D) 12 times the line frequency

A

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Q. Two thyristor of same rating and same specifications

  • (A) will have equal turn on and turn off periods
  • (B) will have equal turn on but unequal turn off periods
  • (C) may have equal or unequal turn on and turn off periods
  • (D) will have unequal turn on and turn off periods

A

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Q. The amount of dielectric heating is inversely proportional to frequency.

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

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