Determine the ratio of starting torque to full-load torque, Electrical Engineering

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A three-phase, 400-V, wye-connected induction motor takes the full-load current at 45 V with the rotor blocked. The full-load slip is 4%. Calculate the tappings k on a three-phase autotransformer to limit the starting current to 4 times the full- load current. For such a limitation, determine the ratio of starting torque to full-load torque.


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