Power Electronics MCQs with answers Page - 24

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Q. A thyristor has a turn on time of 6 μs. If the anode circuit is inductive, the turn on time will be

  • (A) 6 μs
  • (B) less than 6μs
  • (C) more than 6 μs
  • (D) either 6 μs or less

A

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Q. The total number of leads in reverse conducting thyristor is

  • (A) 2
  • (B) 3
  • (C) 1
  • (D) 4

A

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Q. Assertion (A): A TRIAC is a bidirectional SCR. Reason (R): A TRIAC is a four layers 3 terminal device and can conduct in both directions.

  • (A) Both A and R are correct and R is correct explanation of A
  • (B) Both A and R correct but R is not correct explanation of A
  • (C) A is correct but R is wrong
  • (D) A is wrong but R is correct

A

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Q. A semi converter operates in two quadrants.

  • (A) True
  • (B) False
  • (C) none
  • (D) all

A

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Q. A single phase half wave rectifier is feeding a resistive load. When a = 0, dc output voltage is 127 V. When a = 30°, the dc output voltage will be about

  • (A) 127 V
  • (B) 120 V
  • (C) 110 V
  • (D) 100 V

A

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Q. A single phase full wave regulator feeds R-L load. The best gating signal is

  • (A) short duration pulses
  • (B) long duration pulses
  • (C) pulse train
  • (D) either (a) or (b)

A

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Q. A 3 phase induction motor is fed by a 3 phase ac regulator to change the stator voltage. The variation in speed will be more if

  • (A) load torque is constant
  • (B) load torque increases with increase in speed
  • (C) load torque decreases with increase in speed
  • (D) either (a) or (b)

A

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Q. The waveshape of output voltage of half bridge inverter is

  • (A) sinusoidal
  • (B) square
  • (C) triangular
  • (D) either (a) or (b)

A

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Q. The two-transistor model of a thyristor consists of two transistors :

  • (A) one n-p-n and other p-n-p
  • (B) both p-n-p
  • (C) both n-p-n
  • (D) one n-p-n and other UJT

A

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Q. In a thyristor, the forward breakover voltage

  • (A) is constant
  • (B) may be constant or may depend on gate current
  • (C) decreases as gate current is increased
  • (D) increases as gate current is increased

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