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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?

  0.05.
 1.1.
  0.905.
 20.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce eddy current loss only.
 reduce both eddy current and hysteresis loss.
 reduce hysteresis loss only.
 increase the permeability.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 92%
 94%
 96%
 95%

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

None of these
 supply frequency
 rotor resistance
 supply voltage

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Electrical Machines
A series motor is efficiently suitable for

 low starting torque operation.
 constant speed operation.
 none of these.
  high starting torque operation.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  0.54.
 0.3.
  1.
 0.7.

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