Question

A small amount of CO will come out of the exhaust even when the mixture is slightly lean in fuel.

(a) True

(b) False

The question was posed to me by my school teacher while I was bunking the class.

Question is from Engine Emissions topic in division Engine Emissions and their Control of IC Engine

Answer 1

The correct answer is:

(a) True

A small amount of carbon monoxide (CO) can still be produced even when the air-fuel mixture is slightly lean in fuel. This is because, under lean conditions, while there is more air than fuel, the combustion may still be incomplete in some areas or the combustion temperature may not be high enough to fully oxidize the carbon, leading to the formation of CO.