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Which motor can conveniently operate at lagging as well as leading power factor?

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Which motor can conveniently operate at lagging as well as leading power factor?

(a) Synchronous motor

(b) Slip ring induction motor

(c) Squirrel cage induction motor

(d) Stepper motor

I had been asked this question in examination.

I would like to ask this question from Synchronizing Power and Synchronizing Torque in section Synchronous Machine Stability of Electrical Machines

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Right choice is (a) Synchronous motor

The explanation: Its the synchronous motor which can favourably operate both at leading and lagging power factor.

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