Question

The intake air-fuel mixture is used to push exhaust residual out of the open exhaust port called scavenging.

(a) True

(b) False

I had been asked this question during an interview.

The doubt is from Hydrocarbon Emissions topic in section Engine Emissions and their Control of IC Engine

Answer 1

The correct answer is:

(a) True

Scavenging is the process in which the intake air-fuel mixture helps to push the exhaust gases out of the cylinder through the open exhaust port, clearing the cylinder for the next cycle of combustion. This is particularly relevant in two-stroke engines, where the exhaust and intake processes happen simultaneously, and scavenging is crucial for ensuring that the cylinder is adequately cleared of exhaust gases before the fresh air-fuel mixture enters.