Question

technician a says that catalytic converters are a post - combustion control device that perform a final cleanup of tailpipe emissions. technician b says that catalytic converters create heat as they burn off harmful gasses before leaving the exhaust system. who is correct? a. technician a b. technician b c. both technician a and technician b d. neither technician a nor technician b

Explanation:

• Catalytic converters are indeed post - combustion control devices. They use catalysts to convert harmful pollutants (such as carbon monoxide, unburned hydrocarbons, and nitrogen oxides) in the exhaust gas into less harmful substances (e.g., carbon dioxide, water vapor, and nitrogen) before the exhaust leaves the tailpipe. This is a form of final cleanup of tailpipe emissions, so Technician A is correct.
• The chemical reactions in the catalytic converter (e.g., oxidation of carbon monoxide and unburned hydrocarbons) are exothermic. These reactions release heat as they convert harmful gases. So Technician B is also correct as the catalytic converter does create heat while burning off (converting) harmful gases.

Answer:

C. Both Technician A and Technician B