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: Option B
Solution (By Examveda Team)
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
This Question Belongs to Mechanical Engineering >> Automobile Engineering
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