Power Electronics MCQs with answers Page - 12

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Q. When thyristors are connected in series and parallel, it may be necessary to have :

  • (A) current derating
  • (B) voltage derating
  • (C) both current and voltage derating
  • (D) none of the above

A

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Q. A single phase half wave regulator uses

  • (A) 2 diodes and 2 thyristors
  • (B) 2 thyristors
  • (C) 1 diode and 1 thyristor
  • (D) 2 diodes

A

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Q. A high frequency series inverter consists of

  • (A) a number of series inverters in series
  • (B) a number of series inverters in parallel
  • (C) a number of parallel inverters in parallel
  • (D) a number of parallel inverters in series

A

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Q. In an SCR, the anode current consists of

  • (A) only holes
  • (B) only electrons
  • (C) both electrons and holes
  • (D) either electrons or holes

A

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Q. A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load

  • (A) rectification efficiency will be more than 0.6 and TUF will be more than 0.35
  • (B) rectification efficiency will be more than 0.6 but TUF will be less than 0.35
  • (C) rectification efficiency will be less than 0.6 and TUF will be less than 0.35
  • (D) rectification efficiency will be less than 0.6 but TUF will be more than 0.35

A

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Q. In a thyristor the gate lead is connected to the n layer near the p layer to which anode is connected.

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

A

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Q. A relaxation oscillator uses

  • (A) tunnel diode
  • (B) UJT
  • (C) both tunnel diode and UJT
  • (D) PIN diode

A

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Q. A 3 phase dual converter consists of

  • (A) two 3 phase semiconverters connected in parallel
  • (B) two 3 phase semiconverters connected in antiparallel
  • (C) two 3 phase full converters connected in antiparallel
  • (D) two 3 phase full converters connected in parallel

A

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Q. Which inverter circuit uses coupled inductors?

  • (A) Modified McMurray full bridge inverter
  • (B) McMurray Bedford half bridge inverter
  • (C) Modified McMurray Bedford half bridge inverter
  • (D) Both (b) and (c)

A

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Q. When an SCR is in forward blocking mode, the applied voltage

  • (A) appears across only one junction
  • (B) is equally shared by two junctions
  • (C) is equally shared by three junctions
  • (D) may appear across one or more junctions

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