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Electrical Machines

Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 1000W
 500W
 3000W
 100W

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high speed.
  magnetic inertia.
  high field resistance.
  residual flux.

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  data provided is insufficient.
  2.
  4.
 6.

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Electrical Machines
A short circuit test on a transformer gives

  copper loss at any load.
 copper loss at half load.
 copper loss at full load.
 copper loss at over load.

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Electrical Machines
Hunting in a synchronous motor takes place

  motor is under loaded.
  when load varies.
  when power factor is unity.
  when supply voltage fluctuates.

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  sipper.
  thicker.
  rotor can not have any laminations.
  thinner.

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