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ECE :: Power Electronics

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Power Electronics - Section 5
Power Electronics - Section 6
Power Electronics - Section 7
Power Electronics - Section 8
Power Electronics - Section 9

  1. A fully controlled bridge converter is feeding an RLE load. The load current is I0. The input voltage is Vm sin ωt. The KVL equation to find firing angle a is

    2. A.
    cos a = E + I0R
    B.
    cos a = E + I0R
    C.
    cos a = E - I0R
    D.
    cos a = E - I0R

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  2. A single phase cycloconverter with centre tapped input transformer requires

    3. A.
    2 thyristors
    B.
    4 thyristors
    C.
    8 thyristors
    D.
    either 2 or 4 thyristors

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  3. The duty cycle of a step down chopper is

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  4. In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are

    5. A.
    1
    B.
    2
    C.
    3
    D.
    4

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  5. A rectifier is fed by a transformer. The rms voltage and current at secondary of transformer are Vs and Is. Output dc power is Vdc Idc and output ac power is (Vrms ) (Irms), Transformer utilisation factor TUF is

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  6. Assertion (A): A class C chopper can operate in first and second quadrants

    Reason (R): A class B chopper operates only in second quadrant.

    7. 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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  7. A single phase dual converter consists of

    8. A.
    two fully controlled converters connected in parallel
    B.
    two fully controlled converters connected in antiparallel
    C.
    two fully controlled semiconverters connected in antiparallel
    D.
    two fully controlled semiconverters connected in parallel

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  8. The snubber circuit consists of

    9. A.
    a capacitor connected in series with thyristor
    B.
    a capacitor connected in parallel with thyristor
    C.
    a resistor and capacitor in series connected across thyristor
    D.
    none of the above

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  9. The effect of source inductance in a 3 phase fully controlled bridge converter is to

    10. A.
    decrease the output voltage
    B.
    increase the output voltage
    C.
    decrease the output voltage and increase the output current
    D.
    increase the output voltage and decrease the output current

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  10. In disc mounting of SCR

    11. A.
    SCR is clamped on one side of disc shaped heat sink
    B.
    SCR is clamped between two disc shaped heat sinks
    C.
    The SCR has low current rating
    D.
    None of the above

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