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In a three phase slip ring induction motor, brushes are connected to _________

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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 mentioned

This question was addressed to me in an interview.

Question is from Rotor Frequency topic in chapter Induction Machines of Electrical Machines

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Best 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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