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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Equal to 1.
  Low.
  Same as full load.
  High.

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Rotor winding.
  Both rotor and stator winding.
  Rotor mmf wave.
  Stator winding.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

All of these
 makes the material brittle.
 increases hysteresis loss.
 Increases cost.

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/60.
 PN/2.
 PN/3000.
 PN/120.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 any of the above.
 lagging power factor.
 leading power factor.
 unity power factor.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 50, s = 4.43 %.
  P = 40, s = 5.79 %.
  P = 20, s = 3.33 %.
  P = 60, s = 0.96 %.

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