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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. Multiphase choppers are used in

    2. A.
    low power circuits
    B.
    high power circuit
    C.
    both low and high power circuits
    D.
    medium power circuits

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  2. In a single phase converter using a centre tapped transformer and with a highly inductive load, the firing angles is a. Each thyristor conducts for a period

    3. A.
    p
    B.
    a
    C.
    p - a
    D.

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  3. In a parallel inverter

    4. A.
    each thyristor is turned on twice during each cycle
    B.
    each thyristor is turned on once during each cycle
    C.
    each thyristor is turned on either once or twice in each load cycle
    D.
    each thyristor may be turned on upto four times in each load cycle

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  4. A step up chopper can give an output voltage

    5. A.
    higher than input voltage
    B.
    lower than input voltage
    C.
    both higher and lower input voltage
    D.
    all of the above

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  5. The specified maximum junction temperature of thyristors is about

    6. A.
    50°C
    B.
    80°C
    C.
    120°C
    D.
    200°C

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  6. A bridge type single phase cycloconverter changes the frequency f to f/3. Then one half wave of output contains

    7. A.
    3 full waves of input
    B.
    3 half waves of input
    C.
    6 full waves of input
    D.
    6 half waves of input

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  7. A half bridge inverter

    8. A.
    needs a 3 wire dc supply
    B.
    may use a two wire or 3 wire dc supply
    C.
    has higher output voltage if fed from 3 wire dc supply
    D.
    has higher efficiency if fed from 3 wire dc supply

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  8. A 3 phase series inverter has

    9. A.
    12 thyristors
    B.
    6 thyristors
    C.
    3 thyristors
    D.
    3 or 6 thyristors

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  9. In figure, thyristor Th is in off state. When thyristor is turned on, the peak thyristor current can be

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

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  10. HVDC systems are preferable for only long distances.

    11. A.
    True
    B.
    False

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