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  • Question

  • The snubber circuit consists of


  • Options
  • 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

  • Correct Answer
  • a resistor and capacitor in series connected across thyristor 

    • Power Electronics problems

    Search Results

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

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 2. The number of thyristors in a single phase fully controlled bridge rectifier is

    • Options
    • A. 16
    • B. 8
    • C. 4
    • D. 2
      • Discuss
    • 3. From which instant is the turn off time of a thyristor defined

    • Options
    • A. when anode voltage becomes zero
    • B. when anode current becomes zero
    • C. when both anode voltage and current become zero
    • D. none of the above
      • Discuss
    • 4. When an SCR is reverse biased

    • Options
    • A. two junctions are reverse biased and one junction is forward biased.
    • B. all the three junctions are reverse biased.
    • C. one junction is reverse biased and two junctions are forward biased.
    • D. any of the above depending on the magnitude of reverse bias.
      • Discuss
    • 5. The duty cycle of a step down chopper is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. In a dual converter operated in circulating current mode, the circulating current flows

    • Options
    • A. when load current is zero
    • B. when load current is non-zero
    • C. even when load current is zero
    • D. none of the above
      • Discuss
    • 7. Assertion (A): Light triggering is very suitable for HVDC transmission.

      Reason (R): Light triggering has the advantage of complete electrical isolation of gate circuit.


    • 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
    • 8. In Jone chopper, the commutating element

    • Options
    • A. is a capacitor
    • B. is a capacitor and an inductor
    • C. is a capacitor and an auto transformer
    • D. none of the above
      • Discuss
    • 9. The total number of leads in SCR, DIAC and TRIAC respectively are

    • Options
    • A. 3, 2, 3
    • B. 2, 3, 3
    • C. 3, 3, 2
    • D. 3, 2, 4
      • Discuss
    • 10. Forward rating of an SCR is

    • Options
    • A. the maximum rate of rise of anode voltage which will trigger the SCR
    • B. the maximum rate of rise of anode voltage which will not trigger the SCR if gate signal is applied
    • C. the maximum rate of rise of anode voltage which will not trigger the SCR if gate signal is not applied
    • D. either (b) or (c)
      • Discuss

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