Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

  2.241 Ω.
 2.74 Ω.
 25.564 Ω.
 2.781 Ω.

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Electrical Machines
Flashing the field of DC generator means

  making the magnetic losses forces parallel.
  neutralising residual magnetism.
  creating residual magnetism by a DC source.
 increasing flux density by adding extra turns of winding.

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