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Power Electronics problems

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

  • Options
  • A. True
  • B. False
    • Discuss
  • 4. 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
    • Discuss
  • 5. 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
  • 6. 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
  • 7. A chopper is a high efficiency circuit.

  • Options
  • A. True
  • B. False
    • Discuss
  • 8. 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
  • 9. 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
  • 10. Thyristors connected in series need static and dynamic stabilizing circuits.

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

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