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IC Engine Practice Test: Engine Emissions and their Control
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Engine Emissions and their Control topics include: Engine and hydrocarbon emissions, catalytic converters, ci engines, chemical methods and exhaust gas recirculation. Engine emissions can be controlled in three ways: More complete combustion: This leads to fewer byproducts. Reintroduce hydrocarbons: This can be done back into the engine for combustion. Additional combustion area: This can provide an additional area for oxidation or combustion to occur.  Exhaust emissions from engines contribute to environmental pollution and greenhouse gases on a global scale.  Here are some other ways... Show more
IC Engine Practice Test: Engine Emissions and their Control
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25 Questions

1. Volume of the ceramic structure of a converter is generally about twice the displacement volume of the engine.
2. EGR and lower combustion temperatures contribute to an ____________ in solid soot.
3. Platinum and palladium catalyst promotes the removal of _____________ of the gaseous CO in the exhaust.
4. A single soot particle may contain up to ____________ carbon spheres.
5. With greatly increased mixing efficiency and speeds, large regions of fuel-rich mixtures can be avoided when combustion starts.
6. Under idling conditions the fuel supply is cut off to reduce the level of ____________
7. A charcoal canister is used for trapping gasoline vapours.
8. The amount of flow in EGR, can be as high as ____________ of the total intake.
9. NOx is reduced in a CI engine by the use of EGR.
10. ____________ is collected during engine startup time when the catalytic converter is cold, and then later released back into the exhaust flow when the converter is hot.
11. Charcoal canister is also called ____________ canister.
12. Diatomic oxygen is highly reactive and initiates a number of different reactions.
13. Platinum and palladium catalyst promotes the removal of ____________ of the gaseous HC in the exhaust.
14. Platinum and palladium are two main catalyst materials used for converters on CI engines.
15. When scavenging is done, some of the air and fuel mix with the exhaust gases and are expelled out of the cylinder before the exhaust port closes.
16. The intake air-fuel mixture is used to push exhaust residual out of the open exhaust port called scavenging.
17. A ____________ reduction of cold-start HC has been achieved.
18. ____________ are materials that absorb selected molecular compounds and catalyze chemical reactions.
19. A catalyst is a substance that accelerates a chemical reaction by lowering the energy needed for it to proceed.
20. Cyanuric acid is a ____________ solid material that sublimes in the exhaust flow.
21. _____________is a colourless gas of about the same density of air.
22. The catalyst materials most commonly used are platinum, palladium and rhodium.
23. Catalytic converter is usually a stainless steel container mounted along the exhaust pipe of the engine.
24. A small amount of CO will come out of the exhaust even when the mixture is slightly lean in fuel.
25. Regeneration does not consists of combusting the particulates in the excess oxygen contained in the exhaust of the lean operating CI engine.