Question

During the expansion process the temperature ____________ and then drops very rapidly during the release process.

(a) decreases

(b) increases

(c) remains same

(d) none of the mentioned

The question was posed to me in my homework.

The query is from Heat Rejection topic in portion Heat Rejection and Cooling of IC Engine

Answer 1

The correct answer is:

(a) decreases

During the expansion process (also known as the power stroke) in an internal combustion engine, the temperature decreases as the combustion gases expand and do work on the piston. After the expansion, during the exhaust or release process, the temperature drops rapidly as the exhaust gases are expelled from the cylinder, taking away the heat generated during combustion. This rapid temperature drop occurs because the gases are rapidly released and no longer undergo compression or combustion.