The mechanical efficiency $$\left( {{\eta _{\text{m}}}} \right)$$ of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)

A) $$\frac{{{\text{I}}{\text{.P}}{\text{.}}}}{{{\text{B}}{\text{.P}}{\text{.}}}}$$ B) $$\frac{{{\text{B}}{\text{.P}}{\text{.}}}}{{{\text{I}}{\text{.P}}{\text{.}}}}$$ C) $$\frac{{{\text{B}}{\text{.P}}{\text{.}}}}{{{\text{F}}{\text{.P}}{\text{.}}}}$$ D) $$\frac{{{\text{F}}{\text{.P}}{\text{.}}}}{{{\text{B}}{\text{.P}}{\text{.}}}}$$

Answer & Solution

Correct Answer: Option B

The mechanical efficiency $$\left( {{\eta _{\text{m}}}} \right)$$ of an I.C. engine is equal to $$\frac{{{\text{B}}{\text{.P}}{\text{.}}}}{{{\text{I}}{\text{.P}}{\text{.}}}}$$
Where
I.P. = Indicated power
B.P. = Brake power
F.P. = Frictional power

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The mechanical efficiency $$\left( {{\eta _{\text{m}}}} \right)$$ 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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