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Q#1 Induction Machines GATE EE 1997 MCQ +2 marks -0.66 marks

A 50kVA, 400V, 3-phase, 50Hz squirrel cage induction motor has full load slip of 5%. Its standstill impedance is 0.866 ohms/phase. It is started using a tapped autotransformer. It the maximum allowable supply current at the time of starting is 100A, then calculate the tap position and the ratio of starting torque to full load torque

x=0.4652 and Ratio = 0.4432

x=0.2564 and Ratio = 0.4432

x=0.4652 and Ratio = 0.2351

x=0.2652 and Ratio = 0.4432

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