Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  capacitor run IM.
  transformer with short-circuited secondary.
  repulsion motor type starting.
  synchronous motor.

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

  Increase in speed demanding more armature current.
  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.

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