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Compared with a generator at the same terminal polarity, the neutral axis of a loaded dc motor is displaced

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

Answer: D

Because the armature current is in the opposite sense to that in a generator at the same terminal polarity, the shift is backward rather than forward. A machine that must run both as motor and as generator therefore cannot use a fixed brush shift.

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