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The mechanical efficiency (ηm) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)

A. I.P/B.P.

B. B.P/I.P.

C. B.P/F.P.

D. F.P/B.P.

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Correct Answer : B.


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