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A dc series motor differs from a shunt machine in that its flux

  • A.falls as the load on the machine increases from no load
  • B.is independent of the current flowing in the armature
  • C.varies with the armature current
  • D.is held constant by a separate excitation supply of its own

Answer: C

Because the field carries the armature current, the flux rises with load and the torque rises roughly with the square of the current. That gives the very high starting torque which made the machine the traction motor of choice.

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