Question

If the combustion is complete, the only products being expelled from the exhaust would be water vapour and carbondioxide.

(a) True

(b) False

This question was addressed to me in a job interview.

This is a very interesting question from Engine Emissions in section Engine Emissions and their Control of IC Engine

Answer 1

The correct answer is:

(a) True

If the combustion in an internal combustion engine is complete, the only products produced would be carbon dioxide (CO₂) and water vapor (H₂O). This is because complete combustion means that all the fuel (hydrocarbons) reacts with oxygen (O₂) to produce these two byproducts, assuming there is no excess or deficiency of oxygen and no other incomplete combustion byproducts like carbon monoxide (CO) or hydrocarbons (HC).