A 1100-V, 50-Hz delta-connected induction motor has a star-connected slip-ring rotor with a phase transformation ratio

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A 1100-V, 50-Hz delta-connected induction motor has a star-connected slip-ring rotor with a

phase transformation ratio of 3.8. The rotor resistance and standstill leakage reactance are

0.012 ohm and 0.25 ohm per phase respectively. Neglecting stator impedance and

magnetising current determine:

1.1 The rotor current at start with slip-ring shorted (6)

1.2 The rotor power factor at start with slip-rings shorted (3)

1.3 The rotor current at 4% slip with slip-rings shorted (8)

1.4 The rotor power factor at 4% slip with slip-rings shorted (3)