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The reactive power flow is outward from an alternator, then it is ____________

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The reactive power flow is outward from an alternator, then it is ____________

(a) over excited

(b) under excited

(c) critically excited

(d) none of the mentioned

This question was addressed to me in examination.

This intriguing question originated from Power Flow Through an Inductive Impedance in section Efficiency and Regulation of Electrical Machines

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Correct option is (a) over excited

The explanation is: Because Q > 0; For an alternator, Q = V(Ecosδ -V)/Z.

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