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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 radiation.
 conduction.
  convection.
All of these

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 300 W
 500 W
 250 W
 400W

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Electrical Machines
Crawling in an induction motor is due to

  time harmonics in supply.
  insufficient starting torque.
  space harmonics produced by winding currents.
  slip ring rotor.

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Electrical Machines
If the excitation is reduced, the power factor is

 lagging power factor
None of these
 unity power factor
 leading power factor

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

 compensating winding
All of these
 pole chamfering
 pole stacking

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

 160.
 180.
  150.
 170.

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