Electrical Machines
Star - delta method of starting of motor is not possible in case of

  low horse power motor.
  high speed motor.
  high torque motor.
  single phase induction motor.

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

 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.
 increase in speed demanding more armature current.

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