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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Copper loss
 Magnetic loss
 Eddy current loss

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 open type winding
 wave winding
 lap winding
 closed winding

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  synchronous motor.
  transformer with secondary short circuited.
  capacitor start induction motor.
  repulsion start induction motor.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 armature winding
 commutator
 starters
 field winding

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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%
 -3.33%
 -3%
 +3.33%

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Electrical Machines
In DC machine shape of main field flux distribution is?

 flat tapped or trapezoidal
 peaky in nature
 triangular
 saddle shape

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