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For an underexcited 3 phase synchronous motor, connected to IBB is __________

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For an underexcited 3 phase synchronous motor, connected to IBB is __________

(a) absorbing reactive power from IBB

(b) delivering reactive power to IBB

(c) absorbing zero reactive power from IBB

(d) delivering zero reactive power to IBB

I have been asked this question by my college director while I was bunking the class.

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

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Correct answer is (a) absorbing reactive power from IBB

Explanation: An under excited synchronous motor will act as a source of the reactive power.

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