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In a three phase slip ring induction motor, brushes are connected to _________(a) external star connected resistors(b) dc supply(c) 3-phase ac supply(d) any of the mentionedThis question was addressed to me in an interview.Question is from Rotor Frequency topic in chapter Induction Machines of Electrical Machines

Answer»

The correct ANSWER is (a) EXTERNAL STAR connected resistors

Best explanation: The rotor external resistances must E connected in star and at the external end of the rotor.



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