Power Electronics MCQs with answers Page - 18

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Q. An ideal diode is

  • (A) Unidirectional
  • (B) Bidirectional
  • (C) Fixed voltage polarity
  • (D) Only (a) and (c)

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Q. Bidirectional semiconductor device is

  • (A) Diode
  • (B) BJT
  • (C) SCR
  • (D) TRIAC

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Q. With gate open, the maximum anode current at which SCR is turned off from ON condition is called

  • (A) breakdown voltage
  • (B) peak reverse voltage
  • (C) holding current
  • (D) latching current

A

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Q. The curve between V and I of SCR when anode is positive w.r.t cathode and when anode is negative w.r.t cathode are known as

  • (A) both as forward characteristics
  • (B) both as reverse characteristics
  • (C) former as forward characteristics and later as reverse characteristics
  • (D) former as reverse characteristics and later as forward characteristics

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Q. Form factor of a rectifier is the ratio of

  • (A) Root mean square value of voltage and current to its peak value
  • (B) Root mean square value of voltage and current to its average value
  • (C) Average value of current and voltage to its root mean square value
  • (D) Peak value of current and voltage to its root mean square value

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Q. Ripple factor is the ratio of

  • (A) Rms value of the ac component of load voltage to the dc voltage
  • (B) Average value of the ac component of load voltage to the peak value of voltage
  • (C) Average value of the dc component of load voltage to the ac voltage
  • (D) Peak value of the dc component of load voltage to the ac voltage

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Q. Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of

  • (A) AC input power to the transformer volt - amp rating required by secondary
  • (B) AC input power to the transformer volt - amp rating required by primary
  • (C) DC output power to the transformer volt - amp rating required by secondary
  • (D) DC output power to the transformer volt - amp rating required by primary

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Q. Which of the following finds application in speed control of a dc motor?

  • (A) FET
  • (B) NPN transistor.
  • (C) SCR.
  • (D) None of the above.

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Q. In mercury arc rectifiers the voltage drop in arc is nearly

  • (A) 0.1 volt per centimeter of arc length
  • (B) 1 volt per centimeter of arc length
  • (C) 10 volts per centimeter of arc length
  • (D) 12 to 15 volts per centimeter of arc length.

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Q. A cycloconverter is a _________

  • (A) one stage power converter
  • (B) one stage voltage converter
  • (C) one stage frequency converter
  • (D) none of the mentioned

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