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A compensating or pole-face winding is fitted to

  • A.improve the ventilation of the armature core
  • B.reduce the number of commutator segments needed
  • C.neutralise armature reaction under the pole faces
  • D.provide the shunt excitation of the main field

Answer: C

Conductors in slots in the pole faces, carrying the armature current in the opposite sense, cancel the armature's own field where it does most harm. It is expensive and is fitted only to machines with severe load changes.

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