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  • Question

  • In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is


  • Options
  • A. 36
  • B. 18
  • C. 12
  • D. 8

  • Correct Answer
  • 12 

    • Power Electronics problems

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    • 1. Half bridge and full bridge inverters of one type use different commutation methods.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. In rectifier circuits, the rms value of ac component of output voltage is equal to

    • Options
    • A. Vrms
    • B. 0.5 Vrms
    • C. (Vrms - Vdc)0.5
    • D. (Vrms2 - Vdc2)0.5
      • Discuss
    • 3. If 0.5 T is the time period of oscillations and Toff is the time between turn off of one thyristor and turn on of second thyristor, the frequency of output f of a series inverter is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. Mc Murray full bridge inverter uses

    • Options
    • A. 4 thyristors and 2 diodes
    • B. 4 thyristors and 4 diodes
    • C. 8 thyristors and 4 diodes
    • D. 8 thyristors and 8 diodes
      • Discuss
    • 5. Which of these devices can conduct in both directions?

    • Options
    • A. SCR
    • B. SUS
    • C. SBS
    • D. UJT
      • Discuss
    • 6. Two thyristors of the same rating and specifications

    • Options
    • A. will have equal on state voltage drops
    • B. will have equal forward blocking voltage for the same current
    • C. will have different on state voltage drops
    • D. may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current
      • Discuss
    • 7. In rectifier circuits, ripple factor RF and form factor FF are related as

    • Options
    • A. RF = (FF2 - 1)0.5
    • B. RF = FF
    • C. RF = FF - 1
    • D. RF = (FF - 1)0.5
      • Discuss
    • 8. A chopper is a high efficiency circuit.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. In auxiliary commutated chopper fed by voltage V and having L and C commutating elements, the peak value of capacitor current is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 10. A single phase half wave rectifier is feeding a resistive load. As firing angle is increased

    • Options
    • A. dc output voltage and rms output voltage decrease in the same proportion
    • B. dc output voltage and rms output voltage decrease
    • C. dc output voltage and rms output voltage increase
    • D. dc output voltage and rms output voltage increase in the same proportion
      • Discuss

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