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Reversing the field connections of a shunt generator that has failed to build up will

  • A.increase the critical resistance of the field circuit
  • B.restore build-up if the connections were the cause
  • C.reverse the residual magnetism and prevent build-up permanently
  • D.have no effect of any kind on the machine's behaviour

Answer: B

If the field current opposes the residual flux, the machine drives itself towards zero rather than towards voltage, and swapping the leads fixes it. Getting it wrong the other way round destroys the residual magnetism and calls for the field to be flashed.

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