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ECE :: Power Electronics

Power Electronics - Section 1
Power Electronics - Section 2
Power Electronics - Section 3
Power Electronics - Section 4
Power Electronics - Section 5
Power Electronics - Section 6
Power Electronics - Section 7
Power Electronics - Section 8
Power Electronics - Section 9

  1. A single phase full bridge inverter for R-L loads needs

    2. A.
    4 thyristors
    B.
    4 thyristors and 4 diodes
    C.
    4 thyristors and 2 diodes
    D.
    8 thyristors

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  2. In the basic series inverter circuit, the source current has

    3. A.
    low harmonic content
    B.
    high harmonic content
    C.
    low or high harmonic content depending on firing angle
    D.
    zero harmonic content

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  3. Thyristors connected in series need static and dynamic stabilizing circuits.

    4. A.
    True
    B.
    False

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  4. In a controlled rectifier a freewheeling diode is necessary if the load is

    5. A.
    inductive
    B.
    resistive
    C.
    capacitive
    D.
    any of the above

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  5. For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.

    6. A.
    True
    B.
    False

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  6. A single phase converter is fed by a source having an inductance L. If load current is I0, the decrease in output voltage due to overlap is

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  7. Assertion (A): An ac regulator uses natural commutation

    Reason (R): An ac regulator can be used for static on load tap changing of transformer.

    8. 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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  8. When a UJT is used as a relaxation oscillator the current should be

    9. A.
    less than Ip
    B.
    more than Iv
    C.
    more than Ip but less than Iv
    D.
    negative

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  9. In auxiliary commutated chopper, the charging and discharging time of capacitor

    10. A.
    are constant
    B.
    depend on load current
    C.
    may be constant or may depend on load current
    D.
    none of the above

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  10. Which chopper circuit uses saturable reactor?

    11. A.
    Auxiliary commutated
    B.
    Jones chopper
    C.
    Morgan chopper
    D.
    Load commutated

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