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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 6.
  2.
 4.
  8.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 115 V
 460 V
 200 V

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 load current
 supply frequency
 maximum flux density
 both 2 and 3

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Shaded pole.
  Capacitor start.
  Capacitor run.
  Split phase.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of starting winding.
All of these
 reversing the terminals of main winding.
 interchanging the capacitor from starting winding to main winding or vice versa.

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Electrical Machines
Hysteresis loop represents the area of

 hysteresis loss
 eddy current loss
 total iron losses
 copper loss

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