A 746 kW, 8-pole, 3-phase, 50 Hz induction motor has a rotor resistance of 0.04 Ω per phase and standstill rotor reactance of 0.3 Ω per phase. Full load torque is obtained at 720 rpm. What is the ratio of maximum to full load torque?
1
1.8
2
1.3
3
0.9
4
0.55