5. (20%) A 3, 100 KVA, 460 V, 60 Hz,6 poles wound-rotor induction motor has the following parameters per phase: R1 0.2 ohms, R'= 0.15 ohms, X1-X2'= 0.5 ohms, Xm= 20 ohms (a) Derive the Thevenin equivalent circuit for the induction machine. (5%) The motor is connected to a 3,460 V,60 Hz supply. (b) Please derive the torque at low value of slip in one phase (5%) (c) Slip at which maximum torque is developed (5%) (d) Maximum torque developed (5%)