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A shunt generator run in the reverse direction will

  • A.build up to the same voltage of the opposite polarity
  • B.build up to twice its normal terminal voltage
  • C.build up normally with no change to its behaviour
  • D.fail to build up unless its field connections are also reversed

Answer: D

Reversing the rotation reverses the armature emf relative to the residual flux, so the field current now opposes that flux. Reversing the field leads as well restores the self-exciting condition, with the terminal polarity unchanged.

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