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A field discharge resistance is connected across the field winding to

  • A.reduce the flux the field winding produces in service
  • B.provide a path for the current when the circuit is opened
  • C.increase the field current available at switch-on
  • D.improve the commutation of the armature current

Answer: B

Many turns on iron store a great deal of energy, and interrupting that current without a path induces a voltage high enough to break down the insulation. The resistance is switched in before the field circuit is opened.

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