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An ________ synchronous machine delivers reactive power whereas an ________ one absorbs reactive power.

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An ________ synchronous machine delivers reactive power whereas an ________ one absorbs reactive power.

(a) over excited, under excited

(b) under excited, over excited

(c) over excited, over excited

(d) under excited, normal excited

The question was posed to me during a job interview.

The question is from Power Flow Through an Inductive Impedance in section Efficiency and Regulation of Electrical Machines

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The correct answer is (a) over excited, under excited

The best explanation: An over excited synchronous machine delivers reactive power whereas an under excited one absorbs reactive power.

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