A 3-phase, 4 poles, 1440 rpm, 50hz induction motor has star connected rotor winding, having a resistance of 0.2 ohm per phase and a standstill leakage reactance of 1 ohm per phase. When the stator is energized at rated voltage and frequency, the rotor induced emf at standstill is 120v per phase. A) calculate the rotor current, rotor power factor and torque both at starting and at full load and compare these results b) if an external resistance of 1 ohm per phase is inserted in rotor circuit, calculate rotor current, rotor power factor and torque at the time of starting.
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