Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction.
 motor will not run.
 it will run in opposite direction.
 it will run in same direction by slowly.

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Electrical Machines
In a star - delta starting of an IM

  line voltage is 57.7 % of stator voltage.
  applied voltage per stator phase is 57.7 % of a line volt
  resistance is inserted in the rotor.
  reduced voltage is applied to the stator.

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