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The magnetic neutral axis of a loaded dc generator shifts

  • A.through ninety degrees from the geometric neutral axis
  • B.in the direction of rotation
  • C.against the direction of rotation
  • D.not at all, remaining on the geometric neutral axis

Answer: B

Distortion of the resultant field carries the neutral axis forward in a generator and backward in a motor. Brushes set on the geometric axis then commutate at the wrong instant, which is one reason interpoles are preferred to shifting the brushes.

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