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The operating point for an over excited alternator working near zpf lagging power factor gives ‘A’ as the operating point. Then if the same machine is working as an over excited synchronous motor will give same operating point at __________

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The operating point for an over excited alternator working near zpf lagging power factor gives ‘A’ as the operating point. Then if the same machine is working as an over excited synchronous motor will give same operating point at __________

(a) zpf leading

(b) zpf lagging

(c) upf

(d) there will never be the same operating point for the machine as motor as well as generator

This question was addressed to me in an international level competition.

I need to ask this question from Synchronous Motor Phasor Diagram topic in division Synchronous Motors of Electrical Machines

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Right answer is (a) zpf leading

Best explanation: Yes, by making it from lag to leading power factor, a synchronous machine can have same operating point for the alternator as well as synchronous motor.

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