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Posted by tom on March 21, 2002 at 05:49:17:

In Reply to: Question on Horsepower posted by Dennis on March 16, 2002 at 01:35:42:

: While reading the book "Stationary Engineering" I came across the following sample test question.

: "A 50 HP motor runs at 75% efficiency. What watts per HP are being used?" There are 4 answers to chose from but this book doesn't give the correct answer.

: Can anyone tell me how to solve this question?

: All I know is that one HP is equal to 746 watts but I don't know where to go from there. Thanks.

Dennis,

One horsepower = 746 watts , the motor efficiency = 75%(.75) 746/.75 = 994.66 watts being used per horsepower