Electrical Machines
The basic function of a transformer is to change

 the power factor
 the frequency
 the level of the voltage
 the power level

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Electrical Machines
In a star - delta starting of an IM

  resistance is inserted in the rotor.
  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.

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