Question

Most of the heat is carried away by the cooling system while some are lost by direct radiation from the engine surfaces.

(a) True

(b) False

This question was addressed to me in an interview.

This interesting question is from Heat Rejection in portion Heat Rejection and Cooling of IC Engine

Answer 1

The correct answer is:

(a) True

In an internal combustion engine, most of the heat generated during combustion is carried away by the cooling system (either air-cooled or liquid-cooled). However, a small portion of heat is lost through direct radiation from the engine surfaces. While the cooling system is the primary method of heat rejection, radiation also plays a role, especially at high temperatures, where the engine surfaces emit infrared radiation to dissipate some heat into the surrounding environment.