Electrical Machines
Alternator operates on the principle of

  electromagnetic induction.
  self or mutual induction.
  self induction.
  mutual induction.

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Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

  are provided in a synchronous motor to make it self starting.
  consists of short-circuited copper bars embedded in the field pole faces.
  are provided on the stator for improving power factor.
  both (A) and (B).

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