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Stray load loss in a dc machine arises from

  • A.flux distortion and eddy currents under load
  • B.the resistance of the armature winding at rated current
  • C.friction at the bearings under the weight of the rotor
  • D.the shunt field current flowing in the field winding

Answer: A

Armature reaction redistributes the flux and drives additional eddy currents in the iron and the conductors, and the total is difficult to compute. It is usually allowed for as a percentage of output rather than calculated from first principles.

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