Power Electronics MCQs | Page - 12

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M

Mr. Dubey • 97.30K Points
Coach

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
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M

Mr. Dubey • 97.30K Points
Coach

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
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M

Mr. Dubey • 97.30K Points
Coach

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
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M

Mr. Dubey • 97.30K Points
Coach

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
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M

Mr. Dubey • 97.30K Points
Coach

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
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M

Mr. Dubey • 97.30K Points
Coach

Q. In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current

  • (A) are always similar
  • (B) can never be similar
  • (C) may be similar or dissimilar
  • (D) are similar only if  = 0
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M

Mr. Dubey • 97.30K Points
Coach

Q. Natural commutation can be used in :

  • (A) DC circuits only
  • (B) AC circuits only
  • (C) both AC and DC circuits
  • (D) none of the above
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M

Mr. Dubey • 97.30K Points
Coach

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
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M

Mr. Dubey • 97.30K Points
Coach

Q. McMurray Bedford full bridge inverter uses

  • (A) natural commutation
  • (B) auxiliary commutation
  • (C) complementary commutation
  • (D) any of the above
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M

Mr. Dubey • 97.30K Points
Coach

Q. Which of these commutation methods uses an external pulse for commutation?

  • (A) Class A
  • (B) Class C
  • (C) Class E
  • (D) Class F
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