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Electrical Machines

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

 Very low.
 Zero.
 Very high.
 Normal.

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Electrical Machines
The polarity of a DC generator can be reversed by

 increasing field current.
 reversing the field current.
 reversing field electric current as well as direction of rotation.
 any of above.

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Electrical Machines
_____________ types of induction motor are widely used.

  Squirrel cage IM.
  Slip ring IM.
  Three phase IM.
  Single phase IM.

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Electrical Machines
Regenerative braking is possible in

  DC shunt motor with field weakening control.
 DC compound motor.
 DC shunt motor with armature resistance control.
 DC series motor.

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Brush.
 Armature.
  Commutator.
 Yoke.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Shunt motor.
 Differential compound motor.
 Cummulative compound motor.
 Series motor.

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