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  • Question

  • 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

  • Correct Answer
  • Both A and R correct but R is not correct explanation of A 

    • Power Electronics problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. The circuit in figure is for

    • Options
    • A. resonant commutation
    • B. self commutation
    • C. load commutation
    • D. auxiliary commutation
      • Discuss
    • 4. The turn on characteristics of a power transistor can be assumed to be linear, as shown in the below figure . During turn on time T, voltage reduces linearly from V to 0 and current rises linearly from 0 to I. The energy loss during time T is

    • Options
    • A. VIT
    • B.
    • C.
    • D.
      • Discuss
    • 5. A bridge type single phase cycloconverter changes the frequency f to f/3. Then one half wave of output contains

    • Options
    • A. 3 full waves of input
    • B. 3 half waves of input
    • C. 6 full waves of input
    • D. 6 half waves of input
      • Discuss
    • 6. 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
    • 7. In a single phase full wave ac regulator the firing angles during both half cycles are equal.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. 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
      • Discuss
    • 9. 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
    • 10. 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

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