Question

H2 emissions occur under ____________ operating conditions.

(a) rich

(b) lean

(c) constant

(d) none of the mentioned

The question was posed to me by my college director while I was bunking the class.

I would like to ask this question from Reducing Emissions by Chemical Methods topic in chapter Engine Emissions and their Control of IC Engine

Answer 1

The correct answer is:

(a) Rich

Hydrogen (H₂) emissions tend to occur under rich operating conditions, where the air-fuel mixture has excess fuel relative to oxygen. In such conditions, incomplete combustion can occur, leading to the formation of hydrogen and other hydrocarbons in the exhaust gases.