Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 1Ω.
 0.5Ω.
 0.25Ω.
  0.23Ω.

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Electrical Machines
In a DC machine the armature mmf is

  stationary with respect to field poles.
 rotating with respect to field poles.
  rotating with respect to field poles as well as armature.
  stationary with respect to armature.

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