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A 3-phase synchronous alternator is connected to the infinite bus is over excited, that corresponds to ______________

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A 3-phase synchronous alternator is connected to the infinite bus is over excited, that corresponds to ______________

(a) capacitor

(b) inductor

(c) variable inductor

(d) any of the mentioned

The question was posed to me by my college professor while I was bunking the class.

This is a very interesting question from Machine Applications in section Electrical Machine Applications/Armature Reaction and Commutation of Electrical Machines

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Correct answer is (a) capacitor

For explanation: As the machine is over excited, it will act as source of reactive power and it is positive.

             Q=V (Ecos (delta)-V)/X.

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