Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 leading power factor.
 any of the above.
 lagging power factor.
 unity power factor.

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Electrical Machines
The compensating winding in a DC machine

 is located on commutating poles for improving commutation.
 is located in armature slots for compensation of the armature reaction.
  is located on pole shoes to avoid the sparking at the brushes.
  is located on pole shoes for avoiding the flashover at the commutator.

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