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Discussion

The two reaction theory of a salient pole machine recognises that

  • A.the reactance differs along the pole axis and between the poles
  • B.the machine has two separate field windings on its rotor
  • C.the armature current has two components at right angles
  • D.the machine has two distinct synchronous speeds

Answer: A

Iron along the pole axis and air between the poles give quite different reluctances, so the armature current is resolved into direct and quadrature axis components with a reactance for each. A cylindrical rotor machine needs no such treatment.

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