A 4 pole 60 hz 50 hp 480 v wye connected synchronous motor

Question

A 4 pole, 60 Hz, 50 hp, 480 V wye connected synchronous motor has

R_A = 0

X_s = 2.5 ohms per phase

and is operated at rated output horsepower with a rotational loss of 1000 watts and a separate 400 watt power source for the field current, which is adjusted to provide a power factor of 0.8 leading.

What is the

A. Developed power of the motor

B. Apparent power of the motor

C. Input current (in polar form) using the input phase voltage as reference

D. The value of E_af (in polar form)

E. The total power in watts used by the motor

F. The efficiency