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  • Question
  • A semiconverter feeding an RLE load operates in


  • Options
  • A. first quadrant only
  • B. first and second quadrants
  • C. first and fourth quadrants
  • D. first and third quadrants

  • Correct Answer
  • first quadrant only 

    Explanation
    Semiconvertor operates only in first quadrant.

    Power Electronics problems


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    • 1. A single phase semiconverter is feeding a highly inductive load and has freewheeling diode across the load. The waveshapes of output voltage and output current

    • Options
    • A. are similar
    • B. are not similar
    • C. may be similar or dissimilar
    • D. are similar only if firing angle is zero
    • Discuss
    • 2. The phenomenon of overlap in converter operation due to

    • Options
    • A. source resistance
    • B. source inductance
    • C. both source resistance and source inductance
    • D. high value of firing angle
    • Discuss
    • 3. Assertion (A): A transistor requires a continuous base signal for conduction but a thyristor requires a gate pulse.

      Reason (R): Transistor find widespread application in power electronic circuits.


    • 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
    • 4. Current derating may be necessary when thyristors are operating in

    • Options
    • A. series
    • B. parallel
    • C. series or parallel
    • D. none of the above
    • Discuss
    • 5. The total number of leads in reverse conducting thyristor is

    • Options
    • A. 2
    • B. 3
    • C. 1
    • D. 4
    • Discuss
    • 6. Assertion (A): Inverters and choppers use fast switching thyristors

      Reason (R): Fast switching SCR has low turn off 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
    • 7. For a BJT a = 0.98, then ? =

    • Options
    • A. 0.02
    • B. 0.5
    • C. 4.9
    • D. 48
    • Discuss
    • 8. The terminals of a power BJT are called

    • Options
    • A. emitter, base, collector
    • B. emitter, base, drain
    • C. source, base, drain
    • D. source, base, collector
    • Discuss
    • 9. In a single phase full wave converter (M - 2 connection) feeding a highly inductive load, the firing angle for each thyristor is a in the respective half cycle. The period of conduction of each thyristor is

    • Options
    • A. p - a
    • B. p
    • C. p + a
    • D. p - 2a
    • Discuss
    • 10. A semi converter operates in two quadrants.

    • Options
    • A. True
    • B. False
    • Discuss


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