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A dc machine intended to run in both directions cannot rely on

  • A.a compensating winding in the pole faces
  • B.carbon brushes with their contact resistance
  • C.a fixed shift of the brushes from the neutral axis
  • D.interpoles wound in series with the armature

Answer: C

The neutral axis shifts forward in one direction and backward in the other, so a fixed brush shift is right for one direction and doubly wrong for the other. Interpoles reverse with the current and are correct in both directions.

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