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When the excitation voltage is increased from 1 to 1.3 pu of a 3-phase synchronous motor. Then load angle for the constant power operation __________

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When the excitation voltage is increased from 1 to 1.3 pu of a 3-phase synchronous motor. Then load angle for the constant power operation __________

(a) must be decreased

(b) can also be increased

(c) increased

(d) decreased

I got this question in a national level competition.

I need to ask this question from Power Factor Control of Synchronous Machines topic in chapter Synchronous Machines of Electrical Machines

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Best answer
The correct option is (a) must be decreased

The best explanation: Efsinδ is to be maintained constant. so if excitation voltage increases then the load angle must decrease.

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