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  • Question

  • In a 3 phase full wave regulator feeding resistance load connected in star, the possible range of firing angle a is


  • Options
  • A. 0 ? a ? 180°
  • B. 0 ? a ? 150°
  • C. 0 ? a ? 120°
  • D. 0 ? a ? 90°

  • Correct Answer
  • 0 ? a ? 150° 

    Explanation
    Since output voltage is zero if a ? 150°, the possible range of firing angles is 0 ? a ? 150°.

    Power Electronics problems

    Search Results

    • 1. A dc chopper is feeding an RLE load. The maximum steady state ripple is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. The number of leads in a power semiconductor diode are

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 2 or 3
      • Discuss
    • 3. In a 3 phase full converter the average load current is 150 A. The average thyristor current is

    • Options
    • A. 150 A
    • B. 75A
    • C. 50 A
    • D. 25 A
      • Discuss
    • 4. A thyristor is reverse biased. A positive gate pulse is applied. The thyristor

    • Options
    • A. will be turned on
    • B. may or may not turn on
    • C. will not turn on
    • D. will turn on after sometime
      • Discuss
    • 5. UJT can be used for

    • Options
    • A. firing an SCR
    • B. turning off an SCR
    • C. both firing and turning off an SCR
    • D. none of the above
      • Discuss
    • 6. In a single phase full wave converter (M - 2 connection), the rms transformer voltage is 300 V across each half of secondary. The PIV for each thyristor is

    • Options
    • A. 300 V
    • B.
    • C. 6002 V
    • D.
      • Discuss
    • 7. In a single phase full wave regulator feeding R-L load, the minimum firing angle can be zero.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A single phase half wave converter is feeding a resistive load. Just before triggering, the voltage across thyristor is

    • Options
    • A. zero
    • B. about 1 V
    • C. same as input voltage
    • D. twice the input voltage
      • Discuss
    • 9. Current chopping leads to

    • Options
    • A. over voltage
    • B. over current
    • C. both over voltage and over current
    • D. either over voltage or over current
      • Discuss
    • 10. A reactor is used in a dual converter operating in non-circulating current mode.

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

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