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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. Traps are filter-like system often made of ceramic in the form of a monolith or mat, or metal wire mesh.
2. A charcoal canister is used for trapping gasoline vapours.
3. Pollutants are produced by the incomplete burning of the air-fuel mixture in the combustion chamber.
4. In most converters, the ceramic is a single honeycomb structure with many flow passages.
5. A catalyst is a substance that accelerates a chemical reaction by lowering the energy needed for it to proceed.
6. The intake air-fuel mixture is used to push exhaust residual out of the open exhaust port called scavenging.
7. Platinum and palladium catalyst promotes the removal of ____________ of the gaseous HC in the exhaust.
8. Regeneration does not consists of combusting the particulates in the excess oxygen contained in the exhaust of the lean operating CI engine.
9. Charcoal canister is also called ____________ canister.
10. As the products cool down to exhaust temperature, a minor part of CO reacts with oxygen to form Co2.
11. Adsorption refers to the process of trapping of the gasoline vapours by the activated charcoal particles filled inside the canister.
12. Fuel vapours from the float chamber of the carburettor enter into the canister through the ____________ passage.
13. Platinum and palladium are two main catalyst materials used for converters on CI engines.
14. Purging is the process by which the gasoline vapours are removed from the charcoal particles inside the ___________
15. Air pollution is defined as an addition to our atmosphere of any material which will have a deleterious effect on life upon our planet.
16. EGR and lower combustion temperatures contribute to an ____________ in solid soot.
17. Traps typically remove _____________ of particulates in the exhaust flow.
18. Cyanuric acid is a ____________ solid material that sublimes in the exhaust flow.
19. A ____________ reduction of cold-start HC has been achieved.
20. The blowby HC emissions are about 30% of the total HC emission from the engine.
21. The amount of CO formed ______________ as the mixture becomes more and more rich in fuel.
22. The catalyst materials most commonly used are platinum, palladium and rhodium.
23. Outside the container of the catalytic converter, there is a porous ceramic structure through which the exhaust gas flows.
24. The operation of the purge control valve is taken care of by the exhaust ____________ pressure.
25. More than 90 to 95% of carbon particles originally generated within an engine are thus converted to CO2 and never comes out as carbon particles.