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  • Question

  • When an SCR is in forward blocking mode, the applied voltage


  • Options
  • A. appears across only one junction
  • B. is equally shared by two junctions
  • C. is equally shared by three junctions
  • D. may appear across one or more junctions

  • Correct Answer
  • appears across only one junction 

    • Power Electronics problems

    Search Results

    • 1. In sinusoidal PWM for inverters the width of different pulses are not the same.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. A class D chopper

    • Options
    • A. can operate in first quadrant only
    • B. can operate in second quadrant only
    • C. can operate in either first or fourth quadrant
    • D. can operate in all the quadrants
      • Discuss
    • 3. All other parameters remaining the same, a 3 phase bridge inverter with 180° mode of operation

    • Options
    • A. has the same peak thyristor current as in 120° mode of operation
    • B. has higher peak thyristor current than in 120° mode of operation
    • C. has lower peak thyristor current than in 120° mode of operation
    • D. any of the above
      • Discuss
    • 4. In pulse width modulation of chopper

    • Options
    • A. T is kept constant and Ton is varied
    • B. Ton is kept constant T is varied
    • C. both T and Ton are varied
    • D. either T or Ton is varied
      • Discuss
    • 5. As compared to BJT, MOSFET has

    • Options
    • A. lower switching losses and higher conduction losses
    • B. higher switching losses and higher conduction losses
    • C. higher switching losses and lower conduction losses
    • D. lower switching losses and lower conduction losses
      • Discuss
    • 6. In figure, thyristor Th is in off state. When thyristor is turned on, the peak thyristor current can be

    • Options
    • A. 5 A
    • B. 10 A
    • C. 15 A
    • D. 20 A
      • Discuss
    • 7. A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 ? per phase. The peak value of thyristor current is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. The specified maximum junction temperature of thyristors is about

    • Options
    • A. 50°C
    • B. 80°C
    • C. 120°C
    • D. 200°C
      • Discuss
    • 9. In a 3 phase full wave regulator feeding a star connected resistance load, firing angle is 75°. Then the number of thyristors conducting at one time is

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 10. The output frequency of a cycloconverter can be changed by changing the firing angle.

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

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