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The zero power factor of an alternator can be obtained by _________ at rated Ia.

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The zero power factor of an alternator can be obtained by _________ at rated Ia.

(a) over exciting

(b) conducting short circuit of secondary terminals

(c) under excitation

(d) running as reluctance motor

The question was posed to me in an online quiz.

The doubt is from Synchronous Motor Phasor Diagram in portion Synchronous Motors of Electrical Machines

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The correct option is (a) over exciting

The explanation: By over exciting an alternator gives the additional flux required to make it operate at zero power factor.

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