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The inverted V plots is plotted between ________

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The inverted V plots is plotted between ________

(a) power factor vs field current for constant shaft load

(b) field current vs power factor for variable shaft load

(c) armature current vs field current

(d) terminal voltage vs power factor

I have been asked this question in an internship interview.

This intriguing question originated from Power Factor Correction by Synchronous Motors in portion Synchronous Motors of Electrical Machines

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Right option is (a) power factor vs field current for constant shaft load

Explanation: Inverted v-curves are plotted between power factor and field current for constant shaft load.

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