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At low values of slip, the electromagnetic torque is directly proportional to ___________

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At low values of slip, the electromagnetic torque is directly proportional to ___________

(a) s

(b) s^2

(c) s^3

(d) s^4

I got this question in exam.

My query is from Induction Motors Speed Control topic in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

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The correct answer is (a) s

Best explanation: At low values of slip, the electromagnetic torque is directly proportional to slip value. Due to heavy loading slip value decreases which increases the ratio of R2÷s.

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