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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?

 1.1.
  0.905.
 20.
  0.05.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  depends on the material of stator and the rotor.
  air gap does not matter.
  as small as possible.
  as wide as possible.

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Electrical Machines
Which of the following statements is/are correct ?

 Both A and B.
 Inter pole winding will act in interpolar region.
None of these
 Compensating winding will act under the pole.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using transformer oil of better quality.
 using soft material for winding.
 increasing the number of turns.
 using the magnetic core of low reluctance.

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Electrical Machines
In DC generator, lap winding is used in

 where constant speed is required.
 high voltage and low current applications.
  high current and low voltage applications.
 where greater load is connected.

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Electrical Machines
Armature resistance control method is used for the _______ ?

 below rated speed
 above rated speed
None of these
 both 1 and 2

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