What speed would the machine be capable of converting energy, Electrical Engineering

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Q. An elementary two-pole rotating machine with uniform air gap, as shown in Figure, has a stator-winding self-inductance Lss of 50 mH, a rotor-winding self-inductance Lrr of 50 mH, and a maximum mutual inductance L of 45mH. If the stator were excited from a 60-Hz source, and the rotor were excited from a 25-Hz source, at what speed or speeds would the machine be capable of converting energy?

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