Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

 The motor will run much faster in the same direction.
 The direction of rotation will reverse.
  The motor will run at its normal speed in the same direction as before.
 The motor will stop.

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

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

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