A 10-hp, 230-V, 60 Hz, three-phase wye-connected synchronous motor delivers full load at a power factor of 0.8 leading. The synchronous reactance is 6 Ω, the rotational loss is 230 W, and the field loss is 50 W. Find
a. The armature current.
b. The motor efficiency.
c. The power angle. Neglect the stator winding resistance.