A 1100-V, 50-Hz, 4 pole delta-connected induction motor has a star-connected slip- ring rotor with a phase turns ratio of 3.8:1. The rotor resistance and standstill leakage reactance are 0.012 2 and 0.25 92 per phase respectively. Neglecting stator impedance and magnetising current, calculate the following: Rotor current and power factor at start with slip-rings shorted i) ii) iii) iv) Starting torque (8 marks) Running torque (5 marks) Rotor current and power factor at 4% slip with slip-rings shorted (7 marks) (3 marks)