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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.
 1.1.
  0.05.
 20.

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Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Magnetic loss
 Copper loss
 Eddy current loss

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Universal motor.
  Reluctance motor.
  Synchronous motors.
  Slip ring induction motor.

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 reduce the saturation in the interpole
 economise on the material required for interpoles and their windings
 reduce the overall weight
 increase the acceleration of commutation

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Electrical Machines
Flux density under leading pole tips in case of generator will

 decrease
 increase
None of these
 either increase or decrease

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Electrical Machines
Copper brushes in DC machine are used

 in both of above cases.
 where low voltage and high currents are involved.
 where high voltage and low current.
None of these

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