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A generator driven by a Diesel engine that develops 12hp delivers 28A at 240V. What is...

A generator driven by a Diesel engine that develops 12hp delivers 28A at 240V. What is the efficiency of the generator?

On the textbook solutions they use 30V for this same question instead of 28A. I don’t know if that is a mistake on their part or I’d there is some explanation why they are not using 28A. I also see solutions for this on chegg where they use 28A and thus get a different answer.

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