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

• A.  25.564 Ω.
• B.  2.781 Ω.
• C.   2.241 Ω.
• D.  2.74 Ω.

Answer: (C)