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When a constant power output is desired to maintain ________

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When a constant power output is desired to maintain ________

(a) Ef*sinδ and Ia*cosθ are to be maintained constant

(b) Ef*sinδ is be maintained constant

(c) Ia*cosθ is to be maintained constant

(d) Ef*sinδ and Ia*sinθ are to be maintained constant

The question was posed to me in exam.

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

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The correct option is (a) Ef*sinδ and Ia*cosθ are to be maintained constant

Easiest explanation: For constant real power output the component of the excitation voltage lagging to Vt should remain constant as per the phasor diagram.

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