A 4-pole, 3-phase, 400 V, 50 Hz induction motor has the following parameters of its circuit model (referred to the stator side on an equivalent-star basis):
Rotational losses are 800 W.
(a) For a speed of 1440 rpm, calculate the input current, power factor, net mechanical power output, torque and efficiency,
(b) Calculate the maximum torque and the slip at which it occurs.