Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

  18.
 36.
 80.
 50.

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Electrical Machines
In case of 3 - Φ IM, plugging means

  pulling the motor directly on line without a rotor.
  starting the motor on load which is more than the rated load.
  interchanging two supply phases for quick stopping.
  locking of rotor due to harmonics.

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Electrical Machines
In a star - delta starting of an IM

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

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