Question

The weight per B.P. of air-cooled engine is ___________ than that of water-cooled engine.

(a) greater

(b) less

(c) unpredictable

(d) none of the mentioned

I had been asked this question during an interview.

Origin of the question is Air Cooled Systems in chapter Heat Rejection and Cooling of IC Engine

Answer 1

The correct answer is:

(a) greater

In an air-cooled engine, the engine design typically requires additional components like fins and other structures to increase surface area for heat dissipation. These additional components increase the overall weight of the engine compared to a water-cooled engine, which uses a liquid coolant (water or a mixture) to transfer heat away from the engine. As a result, the weight per brake horsepower (B.P.) is generally greater for air-cooled engines than for water-cooled engines.