Discussion
The ratio of brake power to indicated power of an internal combustion engine is called:
Answer: A
The ratio is the mechanical efficiency.
\[ \eta_{m} = \frac{\text{brake power}}{\text{indicated power}} \]
The difference between indicated and brake power is the friction power lost in the engine's moving parts.
Thermal efficiency compares power with the heat supplied by the fuel, volumetric efficiency compares the air actually inducted with the swept volume, and relative efficiency compares the actual thermal efficiency with that of the air standard cycle.
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