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

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Electrical Machines
With the increase in speed of a DC motor

 back emf falls and line current increases.
 both back emf as well as line current fall.
 both back emf as well as line current increase.
 back emf increases but line current falls.

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