Power Electronics MCQs with answers Page - 5

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A

Admin • 802.91K Points
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Q. For 3 phase rotary converters, when power factor is unity. the ac line to dc current ratio is

  • (A) 1.5
  • (B) 1.1
  • (C) 1.0
  • (D) 0.942.

A

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Q. In an arc rectifier the drop in voltage at the cathode is approximately

  • (A) 1 volt
  • (B) 6 to 7 volts
  • (C) 60 to 70 volts
  • (D) 1.2 V7 volts.

A

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Q. In arc rectifiers mercury is chosen as the liquid for rectifier because

  • (A) it has low specific heat
  • (B) it has low ionization potential
  • (C) it has high atomic weight
  • (D) all of the above.

A

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Q. Ionization potential of mercury is approximately

  • (A) 1 V
  • (B) 2 V
  • (C) 10.4 V
  • (D) 104 V.

A

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Q. Least undulating current will be delivered by which mercury arc rectifier

  • (A) 1-phase
  • (B) 2 phase
  • (C) 3 phase
  • (D) 6 phase.

A

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Q. In a mercury arc rectifier the cathode voltage drop is due to

  • (A) surface resistance
  • (B) expenditure of energy in liberating electrons from the mercury
  • (C) expenditure of energy in ionization
  • (D) expenditure of energy in overcoming the electrostatic field.

A

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Q. In mercury arc rectifier, voltage drop at anode is due to

  • (A) energy spent in overcoming the electrostatic field
  • (B) high temperature inside the rectifier
  • (C) self-restoring property of mercury
  • (D) high ionization potential.

A

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Q. The average life of the glass bulb rectifier is

  • (A) 100 to 150 hours
  • (B) 1000 to 1500 hours
  • (C) 10,000 to 15,000 hours
  • (D) 100,000 to 150,000 hours.

A

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Q. The vacuum inside the glass bulb of a mercury arc rectifier is of the order of

  • (A) 5 x 10-3 cm of Hg
  • (B) 5 x 10-4 cm of Hg
  • (C) 5 x 10-5 cm of Hg
  • (D) 5 x 10-8 cm of Hg.

A

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Q. Which device can be used in a chopper circuit?

  • (A) BJT
  • (B) MOSFET
  • (C) GTO
  • (D) All of the mentioned

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