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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?

 20.
  0.05.
  0.905.
 1.1.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 opposite to the direction of motion of the conductor.
 direction of induced emf.
 direction of flux.
 direction of motion of the conductor.

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f
 f2
 V2
 V

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Electrical Machines
Hysteresis loss will depends on

 f1.6
 f³
 f
 f²

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

  66.91 V.
 76.91 V.
 56.91 V.
 86.91 V.

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Electrical Machines
The stator frame in an induction motor is used to

  provide return path for the flux.
  protect the whole machine.
  hold armature stamping in position.
  ventilate the armature.

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