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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 chopper cannot be line commutated.

    2. A.
    True
    B.
    False

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  2. Natural commutation can be used in :

    3. A.
    DC circuits only
    B.
    AC circuits only
    C.
    both AC and DC circuits
    D.
    none of the above

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  3. In a thyristor the gate lead is connected to the n layer near the p layer to which anode is connected.

    4. A.
    True
    B.
    False

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  4. A single phase half wave rectifier circuit has a free wheeling diode. The free wheeling diode will conduct only if

    5. A.
    load is purely resistive
    B.
    load is purely inductive
    C.
    load is combination of R and L
    D.
    load is purely inductive or combination of R and L

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  5. McMurray Bedford full bridge inverter uses

    6. A.
    natural commutation
    B.
    auxiliary commutation
    C.
    complementary commutation
    D.
    any of the above

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  6. Which converter is used in HVDC transmission?

    7. A.
    3 pulse
    B.
    6 pulse
    C.
    12 pulse
    D.
    24 pulse

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  7. Assertion (A): The turn on time of SCR is about 1 to 4 ms.

    Reason (R): The turn off time of SCR is about 10 to 300 ms.

    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. An n pulse rectifier is fed by a source having an inductance L. If load current is I0, the voltage drop due to overlap is

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  9. Which chopper circuit operates in all the 4 quadrants?

    10. A.
    A
    B.
    C
    C.
    D
    D.
    E

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  10. A single phase cycloconverter feeds a resistance heating load. The heating power is provided by

    11. A.
    only the fundamental component of output wave
    B.
    only higher harmonics in the output wave
    C.
    both fundamental and higher harmonics in the output wave
    D.
    either (a) or (b)

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