Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 armature winding
 starters
 commutator
 field winding

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

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

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