A 3 phase 1.2 MVA, 10 kV star connected synchronous generator has Zs= 0.2+J10 ohm. Using circle diagram only, find: 1. The output power developed at unity power factor with excitation equal to 1.25 of rated voltage. 2. The load angle and power factor if the generator supplies (1500 KW) at rated voltage and excitation equal to (1.2) of rated voltage. 3. .Repeat part (2) when armature resistance is neglected