The rotor resistance and reactance of a wound-rotor induction motor at standstill are 0.14 ohm per phase and 0.8 ohm per phase, respectively. Assuming a transformer ratio of unity, from the eight-pole stator having a phase voltage of 254 V at 60 Hz to the rotor secondary, find the additional rotor resistance required to produce maximum torque at:
A. starting s = 1.
B. a speed of 450 r/min.