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Slip greater than unity is obtained practically by _________

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Slip greater than unity is obtained practically by _________

(a) plugging

(b) changing phase sequence

(c) changing stator leads

(d) any of the mentioned

This question was posed to me during an internship interview.

My question is taken from Analysis of the Equivalent Circuit in portion Induction Machines of Electrical Machines

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Correct choice is (d) any of the mentioned

Easy explanation: The direction of the rotating field can be reversed by any one of the methods.

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