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A synchronous machine which is synchronized with an infinite bus. If it is desired to obtain a condition when the machine delivers the real power to the IBB without changing the field excitation, then __________

(a) reactive power will be consumed by the machine

(b) reactive power will be delivered by the machine

(c) no reactive power flow will take place

(d) none of the mentioned

This question was posed to me in an internship interview.

Question is taken from Power Angle Characteristics of Synchronous Machines in chapter Synchronous Machines of Electrical Machines

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The correct choice is (a) reactive power will be consumed by the machine

To explain: Due to the condition here that it is providing the real power to the infinite bus bar here, the machine will need more flux to produce the real power in the machine.

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