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  • Question

  • 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

  • Correct Answer
  • Both A and R correct but R is not correct explanation of A 

    • Power Electronics problems

    Search Results

    • 1. The stud in a stud mounted SCR acts as

    • Options
    • A. anode
    • B. cathode
    • C. gate
    • D. anode or cathode
      • Discuss
    • 2. 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
    • 3. The total number of leads in MOS controlled thyristor is

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 2 or 3
      • Discuss
    • 4. 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
    • 5. Which of these commutation methods uses two leads?

    • Options
    • A. Class A
    • B. Class B
    • C. Class C
    • D. Class D
      • Discuss
    • 6. 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
    • 7. 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
    • 8. In a cycloconverter it is possible to vary

    • Options
    • A. only output frequency
    • B. only output voltage
    • C. both output voltage and frequency but not simultaneously
    • D. both output voltage and output frequency simultaneously
      • Discuss
    • 9. A single phase full bridge inverter for R-L loads needs

    • Options
    • A. 4 thyristors
    • B. 4 thyristors and 4 diodes
    • C. 4 thyristors and 2 diodes
    • D. 8 thyristors
      • Discuss
    • 10. In a full bridge inverter fed by a battery of voltage V, the rms value of fundamental component of output voltage is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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