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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
  0.05.
 1.1.
 20.

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of supply frequency.
  Change of number of pole.
  Change of rotor resistance.
  Change of supply voltage.

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Electrical Machines
Transformer cooling and insulating oil must be of

 low resistivity.
 low BDV.
 high viscosity.
  low viscosity.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  capacitor run IM.
  transformer with short-circuited secondary.
  synchronous motor.
  repulsion motor type starting.

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 88.8%.
 59.2%.
 48.0%.
 57.1%.

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Electrical Machines
Scott connections are used for

 single phase to three phase transformation.
 any of the above.
 three phase to two phase transformation.
 three phase to single phase transformation.

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