Electrical Machines
In DC machine yoke offers

 flux path completion
 produce working flux
 mechanical protection to the machine
 both A and B

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

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

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