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  • Question

  • When a single phase dual converter is operating in circulating current mode


  • Options
  • A. both converters are working as rectifiers simultaneously
  • B. one converter is always working as rectifier and the other as inverter
  • C. only one converter is working at one time
  • D. both converters are either working as rectifiers or as inverters simultaneously

  • Correct Answer
  • one converter is always working as rectifier and the other as inverter 

    • Power Electronics problems

    Search Results

    • 1. The load circuit of a single phase full bridge inverter

    • Options
    • A. must be underdamped
    • B. must be overdamped
    • C. may be underdamped or overdamped
    • D. may be any type of load
      • Discuss
    • 2. Forward rating of an SCR is

    • Options
    • A. the maximum rate of rise of anode voltage which will trigger the SCR
    • B. the maximum rate of rise of anode voltage which will not trigger the SCR if gate signal is applied
    • C. the maximum rate of rise of anode voltage which will not trigger the SCR if gate signal is not applied
    • D. either (b) or (c)
      • Discuss
    • 3. The total number of leads in SCR, DIAC and TRIAC respectively are

    • Options
    • A. 3, 2, 3
    • B. 2, 3, 3
    • C. 3, 3, 2
    • D. 3, 2, 4
      • Discuss
    • 4. In Jone chopper, the commutating element

    • Options
    • A. is a capacitor
    • B. is a capacitor and an inductor
    • C. is a capacitor and an auto transformer
    • D. none of the above
      • Discuss
    • 5. Assertion (A): Light triggering is very suitable for HVDC transmission.

      Reason (R): Light triggering has the advantage of complete electrical isolation of gate circuit.


    • 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
    • 6. In disc mounting of SCR

    • Options
    • A. SCR is clamped on one side of disc shaped heat sink
    • B. SCR is clamped between two disc shaped heat sinks
    • C. The SCR has low current rating
    • D. None of the above
      • Discuss
    • 7. As compared to a p-n junction diode

    • Options
    • A. a schottky diode has lower cut in voltage and lower reverse saturation current
    • B. a schottky diode has higher cut in voltage and higher reverse saturation current
    • C. a Schottky diode has lower cut in voltage and higher reverse saturation current
    • D. a schottky diode has higher cut in voltage and lower reverse saturation current
      • Discuss
    • 8. Which of the following is correct for a BJT?

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. Thyristors can be used for control of

    • Options
    • A. dc separately excited motor
    • B. dc shunt motor
    • C. dc series motor
    • D. all of the above
      • Discuss
    • 10. Assertion (A): A class C chopper can operate in first and second quadrants

      Reason (R): A class B chopper operates only in second quadrant.


    • 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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