Power Electronics MCQs with answers Page - 21

Here, you will find a collection of MCQ questions on Power Electronics. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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A

Admin • 833.24K Points
Coach

Q. In a thyristor, the magnitude of the anode current will:

  • (A) increase if the gate current is increased
  • (B) decrease if the gate current is decreased
  • (C) increase if gate current is decreased
  • (D) no change with the variation of the gate current

A

Admin • 833.24K Points
Coach

Q. In a thyristor, ratio of latching current to holding current is:

  • (A) 0.4
  • (B) 1.0
  • (C) 2.5
  • (D) 4.0

A

Admin • 833.24K Points
Coach

Q. Once SCR starts conducting a forward current, its gate losses control over:

  • (A) anode circuit voltage only
  • (B) anode circuit current only
  • (C) anode circuit voltage and current
  • (D) none of the above

A

Admin • 833.24K Points
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Q. On state voltage drop across thyristor used in a 230 V supply system is of the order:

  • (A) 110-115V
  • (B) 250 V
  • (C) 1- 1.5 V
  • (D) none of the above

A

Admin • 833.24K Points
Coach

Q. Silicon controlled rectifier can be turned on

  • (A) By applying a gate pulse and turned off only when current becomes zero
  • (B) And turned off by applying gate pulse
  • (C) By applying a gate pulse and turned off by removing the gate pulse
  • (D) By making current non zero and turned off by making current zero

A

Admin • 833.24K Points
Coach

Q. TRIAC is a semiconductor power electronic device which contains

  • (A) Two SCR’s connected in reverse parallel
  • (B) Two SCR’s connected in parallel
  • (C) Two SCR’s connected in series
  • (D) Two BJT’s connected in series

A

Admin • 833.24K Points
Coach

Q. An SCR can be used

  • (A) as static conductor
  • (B) for power control
  • (C) for speed control of dc shunt motor
  • (D) all of these

A

Admin • 833.24K Points
Coach

Q. A crowbar is a circuit which is used to protect a

  • (A) voltage sensitive load from excessive dc power supply output voltages
  • (B) current sensitive load from excessive dc power supply output voltages
  • (C) voltage sensitive load from excessive ac power supply output voltages
  • (D) current sensitive load from excessive ac power supply output voltages

A

Admin • 833.24K Points
Coach

Q. The advantage of using free – wheeling diode in half controlled bridge converter is that

  • (A) There is always a path for the dc current independent of the ac line
  • (B) There is always a path for the ac current independent of the ac line
  • (C) There is always a path for the dc current dependent of the ac line
  • (D) There is always a path for the ac current independent of the ac line

A

Admin • 833.24K Points
Coach

Q. Harmonics in 3 phase inverters can be reduced by using

  • (A) Passive filter
  • (B) Active filter
  • (C) Both passive and active filters
  • (D) None of these

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