Catalytic Converters Quiz

Who is correct? Technician A says the oxidation process works best when the exhaust is rich. Technician B says the reduction process works best when the exhaust is lean.

• Neither Technician A nor Technician B

• Technician A only

• Both Technician A and Technician B

• Technician B only

What are the three harmful waste products produced by the combustion process?

• Nitrogen, hydrogen, carbon monoxide

• Carbon dioxide, carbon monoxide, oxygen

• Hydrocarbons, carbon monoxide, oxides of nitrogen

• Water, oxygen, nitrogen

What is the function of a three way converter with additional air?

• To improve the performance of the oxidation catalyst and lower emissions further

• To reduce hydrocarbons and carbon monoxide emissions

• To remove oxygen from NOX to produce N2 and O2

• To convert HC to H2O and CO to CO2

What is the purpose of the oxygen sensor in a catalytic converter?

• To measure the O2 content in the exhaust gases and play an important part in converter operation

• To check for broken monolith

• To measure the temperature difference between converter exhaust in and out

• To inspect the converter and shields for physical damage

What can a fouled converter cause?

• A drop in fuel economy

• High HC and CO emissions and a rotten egg odor

• A lack of high-speed engine power

• All of the above

What is the operation, efficiency, and working life of a catalytic converter dependent on?

• The presence of heat to remove oxygen from NOX

• The temperature difference between converter exhaust in and out

• The exhaust gases containing the correct amount of O2

• The signal from the downstream O2 sensor

What is the purpose of the secondary air system connected to some converters?

• To inspect the converter and shields for physical damage

• To improve the performance of the oxidation catalyst and lower emissions further

• To check for broken monolith

• To measure the temperature difference between converter exhaust in and out

What is the reduction converter in a three way converter made from?

• Rhodium

• Platinum

• Cerium

• Palladium