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Opening the field circuit of a running shunt generator causes the terminal voltage to

  • A.collapse to the small residual value
  • B.rise sharply as the field current is interrupted
  • C.remain unchanged
  • D.reverse in polarity at the machine terminals

Answer: A

With no field current the flux falls to whatever residual magnetism remains and the emf with it. The inductive kick as the field current is interrupted can be large, which is why field circuits are opened through a discharge resistance.

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