Power Electronics MCQs with answers Page - 17

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Q. A cycloconverter is a:

  • (A) Frequency changer from higher to lower frequency with one-state conversion
  • (B) Frequency changer from higher to lower frequency with two-stage conversion
  • (C) Frequency changer from lower to higher frequency with one-stage conversion
  • (D) Either a or c

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Q. IGT stands for

  • (A) Insulated gate bipolar transistor
  • (B) Insulated gate bidirectional transistor
  • (C) Inductive gate bipolar transistor
  • (D) Inductive gate bidirectional transistor

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Q. Number of PN junction in an SCR is

  • (A) Two
  • (B) Three
  • (C) Four
  • (D) Five

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Q. In a silicon controlled rectifier, the load is connected

  • (A) Across anode
  • (B) In series with anode
  • (C) Across cathode
  • (D) In series with cathode

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Q. For mercury arc rectifiers, the anode is usually made of

  • (A) Aluminium
  • (B) Copper
  • (C) Tungsten
  • (D) Graphite.

A

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Q. In a phase controlled 3 phase ac voltage controller, the harmonic present is

  • (A) 2
  • (B) 3
  • (C) 5
  • (D) 7

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Q. The maximum firing angle in the half wave controlled regulator is

  • (A) 180 degree
  • (B) 190 degree
  • (C) 200 degree
  • (D) 210 degree

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Q. The on - state voltage drop of IGBT consists of

  • (A) Drop across the collector junction
  • (B) Drop across the drift region
  • (C) Drop across MOSFET portion
  • (D) All of these

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Q. To detect an over - current fault condition, the most reliable method is to connect a

  • (A) Current sensor across IGBT
  • (B) Voltage sensor across IGBT
  • (C) Current sensor in series with IGBT
  • (D) Voltage sensor in series with IGBT

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Q. The IGBT resulted in higher switching speed and lower energy losses. It can be used for

  • (A) Uninterruptible power supplies
  • (B) Induction heating system
  • (C) Constant voltage and frequency power supplies
  • (D) All of these

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