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 by my college director while I was bunking the class.Origin of the question is Power Factor Control of Synchronous Machines topic in chapter Synchronous Machines of Electrical Machines

When a constant power output is desired to maintain __________(a) Ef*s

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 by my college director while I was bunking the class.Origin of the question is Power Factor Control of Synchronous Machines topic in chapter Synchronous Machines of Electrical Machines
Answer» Correct choice is (a) Efsinδ and Iacosθ are to be MAINTAINED constant To explain: 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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