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Synchronous reactance of a machine is the sum of

  • A.leakage reactance and the reactance representing armature reaction
  • B.the resistance and the reactance of the armature winding
  • C.the field winding reactance and the armature resistance
  • D.the direct and quadrature axis reactances of the rotor

Answer: A

Treating armature reaction as a reactance lets it be lumped with the leakage reactance into one element, which is what makes the simple phasor diagram possible. Its per unit value usually exceeds unity in a large machine.

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