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  • Question

  • 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

  • Correct Answer
  • 3 half waves of input 

    • Power Electronics problems

    Search Results

    • 1. 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
    • 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. 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
    • 4. A 3 phase dual converter consists of

    • Options
    • A. two 3 phase semiconverters connected in parallel
    • B. two 3 phase semiconverters connected in antiparallel
    • C. two 3 phase full converters connected in antiparallel
    • D. two 3 phase full converters connected in parallel
      • Discuss
    • 5. The circuit in figure is for

    • Options
    • A. resonant commutation
    • B. line commutation
    • C. auxiliary commutation
    • D. complementary commutation
      • Discuss
    • 6. 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
    • 7. The circuit in figure is for

    • Options
    • A. resonant commutation
    • B. self commutation
    • C. load commutation
    • D. auxiliary commutation
      • Discuss
    • 8. 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
    • 9. 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
    • 10. 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

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