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If the frequency is reduced by 50% for a 3-phase, 50 Hz induction motor having 4 poles. The slip at which the maximum torque occurs becomes _________

(a) 2*s

(b) s

(c) 1/2s

(d) 1/s

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Origin of the question is Induction Motor Phasor Diagram topic in division Induction Machines of Electrical Machines

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Best answer
Correct option is (a) 2*s

The best explanation: s = r/x

             s α 1/f.

             If the frequency is reduced to half, slip increases to twice.

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