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Power Electronics problems

  • 1. In a 3 phase full converter the average load current is 150 A. The average thyristor current is

  • Options
  • A. 150 A
  • B. 75A
  • C. 50 A
  • D. 25 A
    • Discuss
  • 2. The number of leads in a power semiconductor diode are

  • Options
  • A. 2
  • B. 3
  • C. 4
  • D. 2 or 3
    • Discuss
  • 3. A dc chopper is feeding an RLE load. The maximum steady state ripple is

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 4. In a 3 phase full wave regulator feeding resistance load connected in star, the possible range of firing angle a is

  • Options
  • A. 0 ? a ? 180°
  • B. 0 ? a ? 150°
  • C. 0 ? a ? 120°
  • D. 0 ? a ? 90°
    • Discuss
  • 5. In a single phase full wave converter (M - 2 connection), the rms transformer voltage is 300 V across each half of secondary. The PIV for each thyristor is

  • Options
  • A. 300 V
  • B.
  • C. 6002 V
  • D.
    • Discuss
  • 6. In a single phase full wave regulator feeding R-L load, the minimum firing angle can be zero.

  • Options
  • A. True
  • B. False
    • Discuss
  • 7. A single phase half wave converter is feeding a resistive load. Just before triggering, the voltage across thyristor is

  • Options
  • A. zero
  • B. about 1 V
  • C. same as input voltage
  • D. twice the input voltage
    • Discuss
  • 8. Current chopping leads to

  • Options
  • A. over voltage
  • B. over current
  • C. both over voltage and over current
  • D. either over voltage or over current
    • Discuss
  • 9. A reactor is used in a dual converter operating in non-circulating current mode.

  • Options
  • A. True
  • B. False
    • Discuss
  • 10. Assertion (A): The gate current of an SCR is always in the form of pulses.

    Reason (R): The gate losses, in pulse triggering, are low.


  • Options
  • 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
    • Discuss

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