Heavy Duty Equipment Technician Red Seal Exam Prep · Question
What is the primary function of the Diesel Oxidation Catalyst (DOC) in a heavy-duty diesel engine after-treatment system?
The Diesel Oxidation Catalyst (DOC) is designed to facilitate a chemical reaction where highly toxic carbon monoxide (CO) and unburnt hydrocarbons (HC) in the e
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Question: What is the primary function of the Diesel Oxidation Catalyst (DOC) in a heavy-duty diesel engine after-treatment system?
Answer options:
- To trap particulate matter (soot) from the exhaust.
- To convert NOx into nitrogen and water. ✅ To oxidize carbon monoxide (CO) and hydrocarbons (HC) into carbon dioxide and water.
- To inject Diesel Exhaust Fluid (DEF) into the exhaust stream.
Correct answer: To oxidize carbon monoxide (CO) and hydrocarbons (HC) into carbon dioxide and water.
Explanation: The Diesel Oxidation Catalyst (DOC) is designed to facilitate a chemical reaction where highly toxic carbon monoxide (CO) and unburnt hydrocarbons (HC) in the exhaust gas are converted into less harmful carbon dioxide (CO2) and water (H2O).
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