Discussion
Match each device in List I with the duty it performs in List II.
List I
A. Three-way catalyst
B. Carbon canister
C. Positive crankcase ventilation
D. Urea injection
List II
1. Exhaust carbon monoxide, hydrocarbons and nitrogen oxides
2. Fuel vapour from the tank
3. Blow-by gases from the crankcase
4. Oxides of nitrogen in a lean diesel exhaust
Select the correct match.
Answer: B
Correct answer: A-1, B-2, C-3, D-4
Each device addresses a different pathway out of the vehicle. The three-way catalyst treats the exhaust, handling all three regulated gases at stoichiometric.
The carbon canister handles fuel vapour from the tank, which never passes through the engine. Positive crankcase ventilation handles blow-by past the piston rings. Urea injection handles nitrogen oxides in lean diesel exhaust, where a three-way catalyst cannot work. Four escape routes, four devices.
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