Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the mass.
 to reduce the hysteresis loss.
 to reduce the inductor.

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Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor

  Decrease in speed demanding less armature current.
  Decrease in speed but armature current remains the same.
  Increase in speed demanding more armature current.
  Increase in speed but armature currnet remains the same.

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