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The reactive power in synchronous machine is proportional to __________

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The reactive power in synchronous machine is proportional to __________

(a) torque

(b) excitation

(c) sinϕ

(d) all of the mentioned

The question was posed to me in a job interview.

This intriguing question comes from Physical Concepts of Synchronous Machine Operation in section Synchronous Machines of Electrical Machines

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The correct answer is (b) excitation

To elaborate: Reactive power depends on the excitation of the synchronous machine.

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