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  • Question

  • A class E chopper


  • Options
  • A. can operate in second quadrant only
  • B. can operate in first or third quadrant
  • C. can operate in all the four quadrants
  • D. can operate in either second or third quadrant

  • Correct Answer
  • can operate in all the four quadrants 

    • Power Electronics problems

    Search Results

    • 1. Which statement is correct?

    • Options
    • A. BJT and MOSFET are current controlled devices
    • B. BJT is voltage controlled and MOSFET is current controlled device
    • C. BJT and MOSFET are voltage controlled devices
    • D. BJT is current controlled and MOSFET is voltage controlled device
      • Discuss
    • 2. Assertion (A): SUS is a PUT and avalanche diode connected between gate and cathode

      Reason (R): SBS has two SUS inbuilt together and connected in anti-parallel


    • 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
    • 3. A step down cycloconverter has an input frequency f. If it uses natural commutation, the output frequency

    • Options
    • A. must be a sub-multiple of input frequency
    • B. can be any frequency
    • C. must be an even sub-multiple of input frequency
    • D. must be an odd sub-multiple of input frequency
      • Discuss
    • 4. In a half bridge inverter circuit fed by a battery of voltage V, the rms value of fundamental component of output voltage is

    • Options
    • A. 2 V
    • B.
    • C.
    • D.
      • Discuss
    • 5. A cycloconverter uses

    • Options
    • A. natural commutation
    • B. forced commutation
    • C. either natural or forced commutation
    • D. both natural and forced commutation together
      • Discuss
    • 6. Which of the following commutation methods is the overall circuit under damped?

    • Options
    • A. Class A
    • B. Class B
    • C. Class C
    • D. Both class A and Class B
      • Discuss
    • 7. In a full bridge single phase inverter feeding RLC load

    • Options
    • A. one thyristor and one diode conduct simultaneously
    • B. two thyristors conduct simultaneously
    • C. two thyristors or two diodes conduct simultaneously
    • D. four thyristors conduct simultaneously
      • Discuss
    • 8. In a parallel inverter the turn off time tq of thyristor and values of commutating elements L and C are related as

    • Options
    • A. tq = pLC
    • B. tq = LC
    • C. tq = LC
    • D. tq = LC
      • Discuss
    • 9. A single phase full wave regulator feeds a resistive load. The firing angle of thyristors is 90°. The input power factor is

    • Options
    • A. 1
    • B. 0.707 lagging
    • C. 0.5 lagging
    • D. 0.2 lagging
      • Discuss
    • 10. A rectifier is fed by a transformer. The rms voltage and current at secondary of transformer are Vs and Is. Output dc power is Vdc Idc and output ac power is (Vrms ) (Irms), Transformer utilisation factor TUF is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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