Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the maintenance and repair
All of these
 increase the iron loss
 increases the design cost

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Electrical Machines
The compensating winding in a DC machine

 is located in armature slots for compensation of the armature reaction.
 is located on commutating poles for improving commutation.
  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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