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In a three phase induction motor, rotor current in each phase lags behind the generated emf in that phase to rotor by a power factor angle of _________

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In a three phase induction motor, rotor current in each phase lags behind the generated emf in that phase to rotor by a power factor angle of _________

(a) atan(r2/x2)

(b) atan(x2/r2)

(c) atan(x1/r1)

(d) atan(r1/x1)

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Question is from Flux and MMF Phasors and Waves in Induction Motors topic in section Induction Machines of Electrical Machines

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Correct answer is (b) atan(x2/r2)

Explanation: The power factor angle is atan(x2/r2).

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