If a diesel engine is run with a rich air-fuel-ratio, which of the following tailpipe emissions would be likely to increase?

Name: If a diesel engine is run with a rich air-fuel-ratio, which of the following tailpipe emissions would be likely to increase?
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Question

Quizplus · Accepted Answer

Running a diesel engine with a rich air-fuel ratio increases the production of hydrocarbons (HC) due to incomplete combustion, as there is insufficient oxygen to completely burn the fuel.

If a Diesel Engine Is Run with a Rich Air-Fuel-Ratio