Electrical Machines
In a star - delta starting of an IM

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

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Electrical Machines
Cogging in induction motor occurs when

 number of stator teeth - number of rotor teeth = odd number.
 number of stator teeth - number of rotor teeth = 0.
 number of stator teeth - number of rotor teeth = negative number.
 number of stator teeth - number of rotor teeth = even number.

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