Electrical Machines
Hunting in a synchronous motor takes place

  motor is under loaded.
  when load varies.
  when supply voltage fluctuates.
  when power factor is unity.

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Electrical Machines
In a star - delta starting of an IM

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

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