A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is
(A) 216 V (B) 226 V (C) 234 V (D) 236 V
(A) 216 V (B) 226 V (C) 234 V (D) 236 V