Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Reduce armature heating.
 Reduce starting torque.
 Increase speed
 Increase acceleration duration.

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

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

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