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A synchronous machine is operating at constant load and at unity power factor. If its excitation is increased and then it operates as ___________

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A synchronous machine is operating at constant load and at unity power factor. If its excitation is increased and then it operates as ___________

(a) motor at leading p.f

(b) motor at lagging p.f

(c) absorber of reactive power

(d) generator at leading p.f

This question was posed to me in exam.

My question comes from Starting of Synchronous Motors in chapter Synchronous Motors of Electrical Machines

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Correct answer is (a) motor at leading p.f

The best I can explain: It will operate at leading p.f. if it was in  motoring mode.

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