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A separately excited dc generator has its field

  • A.connected across the armature terminals of the machine
  • B.connected in series with the armature of the machine
  • C.provided by permanent magnets in the yoke
  • D.fed from a supply independent of the armature

Answer: D

Independent excitation makes the flux and therefore the emf controllable without regard to the load, which suits laboratory and Ward-Leonard use. It needs a separate supply, which is why self-excited arrangements are more usual in practice.

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