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The value of slip at which maximum torque occurs ________

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The value of slip at which maximum torque occurs ________

(a) R2÷X2

(b) 4R2÷X2

(c) 2R2÷X2

(d) R2÷3X2

This question was addressed to me during an online exam.

I want to ask this question from Induction Motors Speed Control topic in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

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Correct answer is (a) R2÷X2

To explain: The maximum torque occurs when the slip value is equal to R2÷X2. Maximum torque is also known as breakdown torque, stalling torque and pull-out torque.

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