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  • Question

  • 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. A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance o
  • B. A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance o
  • C. A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance o
  • D. A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance o

  • Correct Answer
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    • Power Electronics problems

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    • 1. 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
    • 2. 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
      • Discuss
    • 3. In sinusoidal PWM for inverters the width of different pulses are not the same.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. 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
    • 5. 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
    • 6. The specified maximum junction temperature of thyristors is about

    • Options
    • A. 50°C
    • B. 80°C
    • C. 120°C
    • D. 200°C
      • Discuss
    • 7. 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
    • 8. The output frequency of a cycloconverter can be changed by changing the firing angle.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The minimum gate current which can turn on SCR is called :

    • Options
    • A. trigger current
    • B. holding current
    • C. junction current
    • D. breakover current
      • Discuss
    • 10. In a parallel inverter

    • Options
    • A. each thyristor is turned on twice during each cycle
    • B. each thyristor is turned on once during each cycle
    • C. each thyristor is turned on either once or twice in each load cycle
    • D. each thyristor may be turned on upto four times in each load cycle
      • Discuss

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