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Power Electronics problems

  • 1. 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
  • 2. 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
  • 3. 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
  • 4. 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
  • 5. 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
  • 6. In a single phase full wave regulator feeding R-L load, short gate pulse are not suitable.

  • Options
  • A. True
  • B. False
    • Discuss
  • 7. Assertion (A): McMurray Bredford half bridge inverter uses complementary commutation

    Reason (R): Three phase inverter can have two modes of operation.


  • 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. A single phase semiconverter is supplying RLE load and has a freewheeling diode across the load. The firing angle is a. The freewheeling diode conducts for

  • Options
  • A. a° in each half cycle
  • B. (p - a)° in each cycle
  • C. a° in one full cycle
  • D. (p + a)° in each half cycle
    • Discuss
  • 9. Which chopper circuit uses saturable reactor?

  • Options
  • A. Auxiliary commutated
  • B. Jones chopper
  • C. Morgan chopper
  • D. Load commutated
    • Discuss
  • 10. For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.

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

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