Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting time.
 smoother acceleration.
 reduced starting current.
 more starting torque.

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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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