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 constantThe 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

When a constant power output is desired to maintain ________(a) Ef*sin

1.	When a constant power output is desired to maintain ________(a) Efsinδ and Iacosθ are to be maintained constant(b) Efsinδ is be maintained constant(c) Iacosθ is to be maintained constant(d) Efsinδ and Iasinθ are to be maintained constantThe 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
Answer» The correct option is (a) Efsinδ and Iacosθ 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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