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ECE :: Power Electronics

Power Electronics - Section 1
Power Electronics - Section 2
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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. The average load current supplied by a thyristor depends on

    2. A.
    firing angle
    B.
    firing frequency
    C.
    magnitude of gate current
    D.
    all of the above

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  2. A dc chopper is feeding an RLE load. The maximum steady state ripple is

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  3. In a 3 phase full wave regulator feeding a star connected resistance load the input voltage is 400 V line to line. The firing angle is 160°. The line to line output voltage would be

    4. A.
    400 V
    B.
    about 100 V
    C.
    about 20 V
    D.
    zero

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  4. A thyristor is reverse biased. A positive gate pulse is applied. The thyristor

    5. A.
    will be turned on
    B.
    may or may not turn on
    C.
    will not turn on
    D.
    will turn on after sometime

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  5. A single phase series converter is used for

    6. A.
    high voltage output
    B.
    high current output
    C.
    high voltage and high current output
    D.
    improving the circuit efficiency

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  6. A single phase half wave controlled rectifier circuit has an R-L load. A freewheeling diode is also in the circuit. When freewheeling diode is conducting the SCR

    7. A.
    is forward biased
    B.
    is reverse biased
    C.
    may be forward biased or reverse biased
    D.
    forward biased initially but reverse biased afterwards

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  7. An SBS can conduct is one direction only.

    8. A.
    True
    B.
    False

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  8. A 750 A circuit uses thyristor of current rating 175 A. If derating is 25%, the number of thyristors in parallel is

    9. A.
    3
    B.
    4
    C.
    6
    D.
    10

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  9. Assertion (A): An inverter does not require forced commutation

    Reason (R): A series inverter is a forced commutation inverter.

    10. 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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  10. In a single phase full wave converter (M - 2 connection), the rms transformer voltage is 300 V across each half of secondary. The PIV for each thyristor is

    11. A.
    300 V
    B.
    C.
    6002 V
    D.

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