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  • Question

  • A string of series connected thyristors needs equalising circuit to


  • Options
  • A. ensure proper firing
  • B. ensure proper current division
  • C. ensure proper voltage division
  • D. none of the above

  • Correct Answer
  • ensure proper voltage division 

    • Power Electronics problems

    Search Results

    • 1. In a single phase full wave ac regulator the firing angles during both half cycles are equal.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. A step up chopper can give an output voltage

    • Options
    • A. higher than input voltage
    • B. lower than input voltage
    • C. both higher and lower input voltage
    • D. all of the above
      • Discuss
    • 3. Assertion (A): A DIAC has four layers but only two terminals.

      Reason (R): A DIAC can conduct in both directions.


    • 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
    • 4. A dc chopper is feeding an RLE load. The condition for maximum ripple is

    • Options
    • A. a = 1
    • B. a = 0.8
    • C. a = 0.5
    • D. a < 0.5
      • Discuss
    • 5. Typical values of for an SCR are in the range of

    • Options
    • A. 1 to 10
    • B. 25 to 500
    • C. 0.1 to 1
    • D. 1000 to 2000
      • Discuss
    • 6. Multiphase choppers are used in

    • Options
    • A. low power circuits
    • B. high power circuit
    • C. both low and high power circuits
    • D. medium power circuits
      • Discuss
    • 7. In a 3 phase full converter feeding a highly inductive load, the average load current is 150 A. The peak current through thyristor is

    • Options
    • A. 150 A
    • B. 75 A
    • C. 50 A
    • D. 300 A
      • Discuss
    • 8. A half bridge inverter

    • Options
    • A. needs a 3 wire dc supply
    • B. may use a two wire or 3 wire dc supply
    • C. has higher output voltage if fed from 3 wire dc supply
    • D. has higher efficiency if fed from 3 wire dc supply
      • Discuss
    • 9. A 3 phase series inverter has

    • Options
    • A. 12 thyristors
    • B. 6 thyristors
    • C. 3 thyristors
    • D. 3 or 6 thyristors
      • Discuss
    • 10. In a single phase converter using a centre tapped transformer and with a highly inductive load, the firing angles is a. Each thyristor conducts for a period

    • Options
    • A. p
    • B. a
    • C. p - a
    • D.
      • Discuss

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