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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. Surge current rating of an SCR is

    2. A.
    the maximum repetitive surge current in which the SCR can withstand
    B.
    the maximum non-repetitive surge current in which the SCR can withstand
    C.
    the maximum repetitive or non repetitive surge current in which the SCR can withstand
    D.
    the maximum surge current in which the SCR can withstand if both surge current and steady current exist together

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  2. Which of the following devices has metal-silicon junction?

    3. A.
    General purpose power diode
    B.
    Schottky diode
    C.
    SCR
    D.
    MOSFET

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  3. In a single phase full wave converter (M-2 connection) feeding on R-L load the input voltage is v = Vm sin ωt. The expression for rms output voltage is

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  4. A dc chopper is feeding an RLE load. The condition for maximum ripple is

    5. A.
    a = 1
    B.
    a = 0.8
    C.
    a = 0.5
    D.
    a < 0.5

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  5. In a series inverter

    6. A.
    the commutating elements L and C are in parallel
    B.
    the commutating elements L and C are in series with load
    C.
    the commutating L and C may be in series or parallel with the load
    D.
    none of the above

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  6. When a power diode is conducting, the voltage drop across it is about

    7. A.
    I V
    B.
    5 V
    C.
    20 V
    D.
    50 V

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  7. In thermal ohm's law, temperature and power loss are analogous to

    8. A.
    V and I respectively of ohm's law
    B.
    I and V respectively of ohm's law
    C.
    R and V respectively of ohm's law
    D.
    I and R respectively of ohm's law

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  8. A string of series connected thyristors needs equalising circuit to

    9. A.
    ensure proper firing
    B.
    ensure proper current division
    C.
    ensure proper voltage division
    D.
    none of the above

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  9. A surge voltage

    10. A.
    has very high magnitude and very long duration
    B.
    has very high magnitude and very small duration
    C.
    has very high magnitude and very small duration and can be positive or negative
    D.
    can be only positive

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  10. The minimum gate current which can turn on SCR is called :

    11. A.
    trigger current
    B.
    holding current
    C.
    junction current
    D.
    breakover current

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