Three Phase Systems In Power Applications MCQ Test

  1. As compared to three phase induction motor the advantage of synchronous Motor in addition to its constant speed is
  2. In a balanced three-phase load, each phase.............
  3. Choppers converter............
  4. Three phase full converter will require ..................number of SCRs.
  5. In case of a three phase full controlled converter with 6 SCRs, commutation occurs every.............
  6. In a three phase AC circuit, the sum of all three generated voltages is.............
  7. An induction motor is...........
  8. The power consumed by a three-phase load can be determined using the formula
  9. The windings of a three-phase alternator are separated by.
  10. Three units of single phase transformers and one single three-phase transformer rating are
  11. For a three-phase full controlled converter with R load, the average value of output voltage is zero for..............
  12. The device which performs DC-AC conversion
  13. Rotor induced EMF is nearly...............of maximum value
  14. In a three phase bridge rectifier circuit for HVDC transmission, the ratio of outout dc voltage to input ac voltage is
Three Phase Systems In Power Applications MCQ

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  • Better efficiency
  • Higher Power factor
  • Both A & B
  • None of the above
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  • One-third of total power
  • Two-thirds of total power
  • A power consumption equal to (√3VL) IL
  • An equal amount of power
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  • AC to AC
  • DC to DC
  • AC to DC
  • AC to DC
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  • Requires external supply
  • Self-starting
  • Both A and B
  • None of these
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  • P = √3 V I cos ø
  • P = 3 V I cos ø
  • P = √3 V I sin ø
  • P = √3 V I
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  • will be same for one rating
  • can never be made same
  • may be same
  • none of the mentioned
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  • Switch
  • Chopper
  • Inverter
  • Rectifier
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  • One-third the phase current
  • Three times the corresponding phase current
  • Equal to the corresponding phase current
  • Zero
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  • Single-phase induction motor
  • Two-phase induction motor
  • Two-phase squirrel-cage motor
  • Three-phase induction motor
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