$\frac{380}{220}$ Volt Y connected Induction motor has below characteristics. Mechanical and iron losses are ignored. All impedances are referred to stator.

$R_S=0\mathrm{.}3,x_S=0\mathrm{.}6,R_r=0\mathrm{.}2,x_r=0\mathrm{.}4$

$S=0\mathrm{.}02,P=4,f=50,x_M=15$

a$)$ find the line current

b$)$ find out torque

c$)$ find max or pull out torgue

d$)$ find start torque.