The following test data are obtained for a three phase, 195 MVA, 15 kV, 60 Hz star-connected synchronous machine. Open circuit test data: If (A) 150 300 450 600 750 900 1200 VLL (kV) 3.75 7.5 11.2 13.6 15 15.8 16.5 Short circuit test data: If = 750 A, Ia = 7000 A The armature resistance is very small. a) Find the unsaturated and saturated values of the synchronous reactance in ohms and in pu b) Find the field current required if the synchronous machine