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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.05.
  0.5.
  1.0.

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 both A and B
 variable loss
None of these
 constant loss

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1600W, 800W
 1000W , 1400W
 800W, 1600W
 1400W, 1000W

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  2.
 6.
  data provided is insufficient.
  4.

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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

 460 V
 230 V
 115 V
 200 V

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Electrical Machines
Stepper motor is used in

All of these
 traction
 computer printers
 food processing

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