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  • Question
  • In a full wave converter (M - 2 connection) feeding an RLE load, the peak thyristor current is 15 A. For fully controlled bridge circuit and same load current, the peak thyristor current will be


  • Options
  • A. 30 A
  • B. 152 A
  • C. 15 A
  • D. In a full wave converter (M - 2 connection) feeding an RLE load, the peak thyristor current is 15 A.

  • Correct Answer
  • 15 A 

    Explanation
    In both the connections the output voltage and peak thyristor current are the same. Both are full wave rectifiers.

    Power Electronics problems


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    • 1. A dc circuit breaker must use

    • Options
    • A. natural commutation
    • B. forced commutation
    • C. both natural and forced commutation
    • D. either natural or forced commutation
    • Discuss
    • 2. The number of doped regions in a SCR is

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
    • Discuss
    • 3. A single phase step up cycloconverter changes 50 Hz to 100 Hz. Then one half wave of input will give rise to

    • Options
    • A. one half wave of output
    • B. one full wave of output
    • C. two full waves of output
    • D. either (b) or (c)
    • Discuss
    • 4. The two modes of operation of three phase bridge inverters are known as

    • Options
    • A. 60° mode and 120° mode
    • B. 90° mode and 120° mode
    • C. 120° mode and 180° mode
    • D. 120° mode and 240° mode
    • Discuss
    • 5. Assertion (A): A dual converter may be circulating current type or non circulating current type.

      Reason (R): In circulating current dual converter only one converter can be operated at one time.


    • Options
    • 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
    • Discuss
    • 6. If ton and toff are the turn on and turn off times of a thyristor, then

    • Options
    • A. ton and toff are almost equal
    • B. ton >> toff
    • C. toff >> ton
    • D. ton is about twice toff
    • Discuss
    • 7. In 180° mode of operation of a 3 phase bridge inverter, two thyristors conduct at one time.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. Which of these commutation methods uses an auxiliary SCR?

    • Options
    • A. Class A
    • B. Class B
    • C. Class C
    • D. Class D
    • Discuss
    • 9. In an SCR, the anode current is controlled by

    • Options
    • A. gate current only
    • B. external circuit only
    • C. both gate current and external circuit
    • D. none of the above
    • Discuss
    • 10. 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

    • Options
    • A. is forward biased
    • B. is reverse biased
    • C. may be forward biased or reverse biased
    • D. forward biased initially but reverse biased afterwards
    • Discuss


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