Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce noise level only.
  prevent hunting and provide the starting torque.
  reduce the eddy currents.
  provide starting torque only.

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Electrical Machines
The residual magnetism of a self-excited dc generator is lost. To build up its emf again

 the armature connection must be reversed
 the field winding connection must be reversed
 field winding must be excited by low voltage dc supply
 the field winding must be replaced

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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.
  line voltage is 57.7 % of stator voltage.
  applied voltage per stator phase is 57.7 % of a line volt

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