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  • Question

  • The total number of leads in MOS controlled thyristor is


  • Options
  • A. 2
  • B. 3
  • C. 4
  • D. 2 or 3

  • Correct Answer
  • 3 

    • Power Electronics problems

    Search Results

    • 1. In a controlled rectifier a freewheeling diode is necessary if the load is

    • Options
    • A. inductive
    • B. resistive
    • C. capacitive
    • D. any of the above
      • Discuss
    • 2. Which of these commutation methods uses two leads?

    • Options
    • A. Class A
    • B. Class B
    • C. Class C
    • D. Class D
      • Discuss
    • 3. A cycloconverter for single phase operation has

    • Options
    • A. one positive group and one negative group converters
    • B. two positive group and two negative group converters
    • C. three positive group and three negative group converters
    • D. any of the above
      • Discuss
    • 4. The difference between resonant commutation and self commutation is

    • Options
    • A. both these methods are based on entirely different principles
    • B. in resonant commutation, the commutating elements carry load current but in self commutation, the commutating elements do not carry load current
    • C. resonant commutation uses L and C but self commutation uses only capacitor
    • D. none of the above
      • Discuss
    • 5. Which of these devices is used in relaxation oscillator?

    • Options
    • A. UJT
    • B. SCR
    • C. DIAC
    • D. TRIAC
      • Discuss
    • 6. A thyristor circuit is feeding an R-L load. The turn on time can be reduced by

    • Options
    • A. decreasing R
    • B. decreasing L
    • C. increasing L
    • D. decreasing R and L together
      • Discuss
    • 7. The stud in a stud mounted SCR acts as

    • Options
    • A. anode
    • B. cathode
    • C. gate
    • D. anode or cathode
      • Discuss
    • 8. Assertion (A): An ac regulator uses natural commutation

      Reason (R): An ac regulator can be used for static on load tap changing of transformer.


    • 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
    • 9. A dc chopper feeds an RLE load and has a duty cycle of 1. The load current will be such that

    • Options
    • A.
    • B. Imax > Imin
    • C. Imin > 0
    • D. Imin < 0
      • Discuss
    • 10. A dc chopper is feeding an RLE load. The current can become discontinuous if

    • Options
    • A. is high
    • B. a is low
    • C. E is high
    • D. none of the above
      • Discuss

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