Electrical Machines
DC Motor

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

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

 increase in speed demanding more armature current.
 decrease in speed but armature current remains the same.
 increase in speed but armature currnet remains the same.
 decrease in speed demanding less armature current.

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