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Calculate the maximum value of slip when rotor resistance is 2 Ω and rotor reactance is 3 Ω.

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Calculate the maximum value of slip when rotor resistance is 2 Ω and rotor reactance is 3 Ω.

(a) 0.66

(b) 0.33

(c) 0.44

(d) 0.99

I got this question during an interview for a job.

This intriguing question comes from Induction Motors topic in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

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Best answer
The correct option is (a) 0.66

The best I can 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. The maximum value of slip is R2÷X2=2/3=.66.

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