3. A 6-pole, 3-phase, 50 Hz induction motor has a rotor resistance of 0-02 2/phase and standstill leakage reactance is 0.1 /phase. Determine the speed to give maximum torque. What external resistance...

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Extracted text: 3. A 6-pole, 3-phase, 50 Hz induction motor has a rotor resistance of 0-02 2/phase and standstill leakage reactance is 0.1 /phase. Determine the speed to give maximum torque. What external resistance per phase is necessary in the rotor circuit to give half maximum torque at starting ? [800 r.p.m. ; 0-07