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)

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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.

Automobile Engineering Practice Set-5