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

  provide starting torque only.
  prevent hunting and provide the starting torque.
  reduce the eddy currents.
  reduce noise level 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 field winding must be replaced
 field winding must be excited by low voltage dc supply
 the field winding connection must be reversed
 the armature connection must be reversed

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