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):
![15_ad31d01f-7010-4b73-a043-20a0703baf69.png](https://secure.tutorsglobe.com/CMSImages/15_ad31d01f-7010-4b73-a043-20a0703baf69.png)
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.