Power Electronics MCQs with answers Page - 7

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Q. In a GTO the n+ layer forms the

  • (A) anode & gate
  • (B) cathode & gate
  • (C) cathode
  • (D) gate

A

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Q. The turn-off gain βoff of the GTO is given by

  • (A) Ig/Ia
  • (B) Ia/Ig
  • (C) Vg/Va
  • (D) Vg/Va

A

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Q. A GTO can be represented by two transistors T1 & T2. The current gain of both transistors are α1 and α2 respectively. A low value of gate current requires

  • (A) low value of α1 and α2
  • (B) low value of α1 and high value of α2
  • (C) high value of α1 and low value of α2
  • (D) high values of α1 and α2

A

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Q. Gold doped GTOs have _____________ as compared to the conventional GTOs

  • (A) high turn-off time
  • (B) low negative gate current requirement
  • (C) low reverse voltage blocking capabilities
  • (D) lower positive gate current requirement

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Q. Latching current for the GTOs is ________ as compared to CTs (Conventional thyristors).

  • (A) more
  • (B) less
  • (C) constant
  • (D) cannot be said

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Q. In case of the two-transistor model (T1 & T2) of GTO with anode-short, the anode-short is placed between the

  • (A) emitter of T1 & T2
  • (B) emitter of T1 & base of T2
  • (C) emitter of T1 & base of T1
  • (D) emitter of T1 & collector of T2

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Q. Choose the correct statement: GTOs have _________ as compared to the CTs.

  • (A) less on-state voltage drop
  • (B) less gate drive losses
  • (C) higher reverse blocking capabilities
  • (D) faster switching speed

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Q. A single-phase voltage controller, using one SCR in anti parallel with a diode, feeds a load R and Vs = 230 V. For a firing angel of 90° for the SCR, the PMMC voltage connected across R would read

  • (A) 0
  • (B) 51.8 V
  • (C) –51.8 V
  • (D) –36.82 V

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Q. A single phase voltage controller has input of 230 V and a load of 15 Ω resistive. For 6 cycles on and 4 cycles off, determine the average value of SCR current.

  • (A) 21.68 A
  • (B) 200 mA
  • (C) 4.14 A
  • (D) 2.07 A

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Q. An IGBT has three terminals called:

  • (A) Collector, Emitter and Base
  • (B) Drain, Source and Base
  • (C) Drain, Source and Gate
  • (D) Collector, Emitter and Gate

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