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

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

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Electrical Machines
With the increase in speed of DC motor

 Both back emf as well as line current increase.
 Both back emf as well as line current fall.
 Back emf falls and line current increase.
  Back emf increase but line current falls.

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