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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
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Supply voltage.
  Field excitaion.
  Armature current.
  Armature voltage.

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 16.55 Nm
 15.6 Nm
 15.28 Nm
 Zero

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Electrical Machines
Armature reaction effect is more in which of the following methods?

 armature resistance control
 field weakening method
 same in both methods
None of these

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

 94%
 92%
 96%
 95%

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Electrical Machines
DC generator will not build up voltage

  if it has lost residual magnetism.
 due to wrong direction of rotation.
 any one of above.
 if field resistance is more than critical resistance.

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