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The field winding of a dc machine produces

  • A.the commutation of the armature current at the brushes
  • B.the magnetic flux the armature works against
  • C.the torque that the machine delivers at its shaft directly
  • D.the back emf that opposes the applied armature voltage

Answer: B

Flux and armature current together give the torque, and flux and speed together give the back emf, so the field enters both of the machine's defining relations. Controlling it is what gives the drive its upper speed region.

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