Power Electronics MCQs with answers Page - 3

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A

Admin • 802.91K Points
Coach

Q. An RC snubber network used in BJT

  • (A) Divert the collector current during turn - off
  • (B) Improves the reverse bias safe operating area
  • (C) Dissipates a fair amount of switching power
  • (D) All of these

A

Admin • 802.91K Points
Coach

Q. In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes

  • (A) Positive
  • (B) Negative
  • (C) Zero
  • (D) None of these

A

Admin • 802.91K Points
Coach

Q. In dual converters,

  • (A) Both rectifiers provides positive current to the load
  • (B) Both rectifiers provide negative current to the load
  • (C) One rectifiers provide positive current to the load and the other negative current
  • (D) One rectifier provide positive current to the source and the other negative

A

Admin • 802.91K Points
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Q. A single phase ac - dc converter is also known as

  • (A) rectifier
  • (B) inverter
  • (C) chopper
  • (D) regulator

A

Admin • 802.91K Points
Coach

Q. Anode of an operational SCR is

  • (A) Always positive w.r.t cathode
  • (B) Always negative w.r.t anode
  • (C) Always positive w.r.t anode
  • (D) Always negative w.r.t cathode

A

Admin • 802.91K Points
Coach

Q. If the gate voltage of an SCR is removed, then the

  • (A) anode current decreases
  • (B) anode current does not decrease at all
  • (C) anode current increases
  • (D) cathode current increases

A

Admin • 802.91K Points
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Q. In a single phase full wave rectifier, during blocking state the peak inverse voltage of diode is

  • (A) V m
  • (B) 2 V m
  • (C) V m / 2
  • (D) 4 V m

A

Admin • 802.91K Points
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Q. In a full wave rectifier, the rectification ratio is approximately equal to

  • (A) 61%
  • (B) 71%
  • (C) 81%
  • (D) 91%

A

Admin • 802.91K Points
Coach

Q. For power output higher than 15 kW, the suitable rectifier is

  • (A) Single phase
  • (B) 3 phase
  • (C) Poly phase
  • (D) Only (b) and (c)

A

Admin • 802.91K Points
Coach

Q. The sum of all phase current in a star connected primary winding with no neutral connection is equal to

  • (A) Phase current
  • (B) Three times the phase current
  • (C) Three times the line current
  • (D) Zero at all times

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