Discussion
Consider the following pairs of emission and where it is worst:
Nitrogen oxides - High power, where flame temperature is highest
Carbon monoxide - Idle, where the chamber runs cool
Unburnt hydrocarbons - Idle and low power
Nitrogen oxides - Idle and low power
How many of the pairs given above are correctly matched?
Answer: A
Correct answer: Only three
The first three are right and they follow from temperature. Nitrogen oxides form fastest where the flame is hottest, which is at high power; carbon monoxide and unburnt hydrocarbons are products of incomplete combustion and are worst at idle, where the chamber runs cool. The fourth contradicts the first by placing nitrogen oxides at idle.
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