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If the machine was operating at upf, then the new excitation voltage will be _________

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If the machine was operating at upf, then the new excitation voltage will be _________

(a) greater than 1 pu

(b) less than 1 pu

(c) 1 pu

(d) zero

The question was posed to me in an online interview.

This intriguing question comes from Operating Characteristics of Alternators and their Ratings in section Synchronous Generators of Electrical Machines

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Best answer
Right choice is (a) greater than 1 pu

To elaborate: The new excitation will be more than 1 pu to compensate for the flux required.

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