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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very high.
 Very low.
 Zero.
 Normal.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3.33%
 -3.33%
 -3%
 +3%

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 reduce the overall weight
 economise on the material required for interpoles and their windings
 reduce the saturation in the interpole
 increase the acceleration of commutation

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  balance the rotor dynamically.
  none of these.
  eliminate noise.
  facilitate cooling of rotor.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 8
 1
 2

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of iron.
 volume of copper.
 reluctance of core.
 iron loss.

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