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When excitation given to a 3-phase alternator is equal to terminal voltage then ____________

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When excitation given to a 3-phase alternator is equal to terminal voltage then ____________

(a) the absorbed reactive power is zero

(b) the absorbed real power is zero

(c) the delivered real power is zero

(d) any of the mentioned

I have been asked this question in an interview for job.

My enquiry is from Power Flow Through an Inductive Impedance in chapter Efficiency and Regulation of Electrical Machines

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Correct choice is (a) the absorbed reactive power is zero

The explanation is: When excitation is equal to the terminal voltage there will not be any net flow of energy across the system.

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