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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. In a 3 phase full wave regulator feeding resistance load connected in star, the possible range of firing angle a is

    2. A.
    0 ≤ a ≤ 180°
    B.
    0 ≤ a ≤ 150°
    C.
    0 ≤ a ≤ 120°
    D.
    0 ≤ a ≤ 90°

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  2. Assertion (A): A dual converter may be circulating current type or non circulating current type.

    Reason (R): In circulating current dual converter only one converter can be operated at one time.

    3. 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. Current chopping leads to

    4. A.
    over voltage
    B.
    over current
    C.
    both over voltage and over current
    D.
    either over voltage or over current

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  4. A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 Ω per phase. The peak value of load current is

    5. A.
    40 A
    B.
    20 A
    C.
    10 A
    D.
    5 A

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  5. In an SCR, the anode current is controlled by

    6. A.
    gate current only
    B.
    external circuit only
    C.
    both gate current and external circuit
    D.
    none of the above

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  6. The rated current of a thyristor is 40 A. The holding current will be about :

    7. A.
    20 A
    B.
    1 A
    C.
    100 mA
    D.
    10 mA

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  7. A cycloconverter is

    8. A.
    ac-dc converter
    B.
    dc-ac converter
    C.
    dc-dc converter
    D.
    ac-ac converter

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  8. The number of leads in a power semiconductor diode are

    9. A.
    2
    B.
    3
    C.
    4
    D.
    2 or 3

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  9. If ton and toff are the turn on and turn off times of a thyristor, then

    10. A.
    ton and toff are almost equal
    B.
    ton >> toff
    C.
    toff >> ton
    D.
    ton is about twice toff

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  10. Assertion (A): The gate current of an SCR is always in the form of pulses.

    Reason (R): The gate losses, in pulse triggering, are low.

    11. 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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