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ECE :: Power Electronics

  1. 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

  2. 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

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  3. In a single phase full wave controlled rectifier using centre tap transformer, the voltage across each half of secondary is Vm sin ωt. The peak inverse voltage is

  4. A.
    2 Vm
    B.
    Vm
    C.
    0.5 Vm
    D.
    0.25 Vm

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  5. Which statement is correct?

  6. 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

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  7. In a three phase series inverter, the firing frequency is

  8. A.
    three times output frequency
    B.
    six times output frequency
    C.
    twice the output frequency
    D.
    equal to output frequency

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  9. A 3 phase fully controlled converter is a

  10. A.
    3 pulse converter
    B.
    6 pulse converter
    C.
    2 pulse converter
    D.
    12 pulse converter

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  11. In a half bridge inverter the gate pulses of the two thyristors have a phase displacement of

  12. A.
    60°
    B.
    90°
    C.
    120°
    D.
    180°

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  13. A fully controlled bridge converter can operate in quadrants

  14. A.
    1
    B.
    1 and 2
    C.
    1 and 3
    D.
    1 and 4

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  15. A class E chopper

  16. 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

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  17. A cycloconverter uses

  18. A.
    natural commutation
    B.
    forced commutation
    C.
    either natural or forced commutation
    D.
    both natural and forced commutation together

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  19. Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant.

    Reason (R): A semi converter is cheaper than a full converter.

  20. 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

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