Power Electronics MCQs with answers Page - 14

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Q. The difference between resonant commutation and self commutation is

  • (A) both these methods are based on entirely different principles
  • (B) in resonant commutation, the commutating elements carry load current but in self commutation, the commutating elements do not carry load current
  • (C) resonant commutation uses L and C but self commutation uses only capacitor
  • (D) none of the above

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Q. In a series inverter

  • (A) the commutating elements carry full load current
  • (B) the commutating elements carry upto 50% of load current
  • (C) the commutating elements do not carry load current
  • (D) any of the above

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Q. Which of these devices is used in relaxation oscillator?

  • (A) UJT
  • (B) SCR
  • (C) DIAC
  • (D) TRIAC

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Q. A single phase full bridge inverter for R-L loads needs

  • (A) 4 thyristors
  • (B) 4 thyristors and 4 diodes
  • (C) 4 thyristors and 2 diodes
  • (D) 8 thyristors

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Q. In the basic series inverter circuit, the source current has

  • (A) low harmonic content
  • (B) high harmonic content
  • (C) low or high harmonic content depending on firing angle
  • (D) zero harmonic content

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Q. Thyristors connected in series need static and dynamic stabilizing circuits.

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

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Q. When a UJT is used as a relaxation oscillator the current should be

  • (A) less than Ip
  • (B) more than Iv
  • (C) more than Ip but less than Iv
  • (D) negative

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Q. In a single phase full wave regulator feeding a resistive load, the average current over one full cycle

  • (A) is always zero
  • (B) cannot be zero
  • (C) may be sometimes zero
  • (D) is always positive

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Q. Which of these devices have four layers?

  • (A) UJT
  • (B) SCR
  • (C) TRIAC
  • (D) SCR and TRIAC

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Q. When UJT is used for thyristor gate signal, the output of UJT is

  • (A) sine wave
  • (B) square wave
  • (C) saw tooth wave
  • (D) either (a) or (c)

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