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Power Electronics problems

  • 1. Surge current rating of an SCR is

  • Options
  • A. the maximum repetitive surge current in which the SCR can withstand
  • B. the maximum non-repetitive surge current in which the SCR can withstand
  • C. the maximum repetitive or non repetitive surge current in which the SCR can withstand
  • D. the maximum surge current in which the SCR can withstand if both surge current and steady current exist together
    • Discuss
  • 2. A surge voltage

  • Options
  • A. has very high magnitude and very long duration
  • B. has very high magnitude and very small duration
  • C. has very high magnitude and very small duration and can be positive or negative
  • D. can be only positive
    • Discuss
  • 3. The total number of leads in SUS, SBS and SCS respectively are

  • Options
  • A. 3, 3, 4,
  • B. 3, 3, 3
  • C. 2, 3, 3
  • D. 3, 3, 5
    • Discuss
  • 4. 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
  • 5. 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
    Electronics and Communication Engineering Power Electronics: The turn on characteristics of a power transistor can be assumed to be linear, as shown in the below

  • Options
  • A. VIT
  • B.
  • C.
  • D.
    • Discuss
  • 6. The circuit in figure is for
    Electronics and Communication Engineering Power Electronics: The circuit in figure is for

  • Options
  • A. resonant commutation
  • B. self commutation
  • C. load commutation
  • D. auxiliary commutation
    • Discuss
  • 7. Typical values of Electronics and Communication Engineering Power Electronics: Typical values of for 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
  • 8. 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
  • 9. 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
  • 10. 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

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