A 19 kVA, 220 V, 50 Hz, 1- alternator has effective resistance of 0.016 ohm and an armature leakage reactance of 0.07 ohm. Compute the

A 19 kVA, 220 V, 50 Hz, 1-φ alternator has effective resistance of 0.016 ohm and an armature leakage reactance of 0.07 ohm. Compute the voltage induced in the armature when the alternator is delivering rated current at a load PF of 

(a) unity,

(b) 0.7 lagging, and 

(c) 0.7 leading.