Heavy Duty Equipment Technician Red Seal Exam Prep · Question
Which of the following is a primary function of an exhaust gas recirculation (EGR) system in a modern diesel engine?
EGR systems recirculate a portion of the exhaust gas back into the engine's combustion chambers. This lowers combustion temperatures, which in turn reduces the
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Question: Which of the following is a primary function of an exhaust gas recirculation (EGR) system in a modern diesel engine?
Answer options: ✅ To reduce NOx emissions
- To increase fuel efficiency
- To cool the engine block
- To lubricate engine components
Correct answer: To reduce NOx emissions
Explanation: EGR systems recirculate a portion of the exhaust gas back into the engine's combustion chambers. This lowers combustion temperatures, which in turn reduces the formation of nitrogen oxides (NOx), a harmful pollutant.
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