Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  star.
  delta.
  delta or star according to need.
None of these

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Electrical Machines
In a star - delta starting of an IM

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

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