Question

The ratio of the brake power to the indicated power is called ______________

(a) mechanical efficiency

(b) overall efficiency

(c) indicated thermal efficiency

(d) volumetric efficiency

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This interesting question is from Engine Efficiencies topic in section Measurements and Testing/Performance Parameters and Characteristics of IC Engine

Answer 1

The correct answer is:

(a) mechanical efficiency

Mechanical efficiency is defined as the ratio of brake power (the actual power output of the engine) to indicated power (the total power generated in the engine's cylinders, including losses). It indicates how efficiently the engine converts the indicated power into usable output, accounting for mechanical losses in components like the crankshaft, bearings, and pistons.