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PA emissions - gases Questions with Solutions
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PA emissions - gases
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PA emissions - gasesAir pollution - answer “contamination of the atmosphere by gaseous, liquid, or solid
wastes or byproducts that can
endanger human health and the health and welfare of plants and animals, or can attack
materials, reduce visibility, or produce undesirable odors."
can be emitted from either natural or human-made sources.
3 major pollutants - answer hydrocarbons (HCs), carbon monoxide (CO), and nitrogen
oxides (NOx). Other pollutants include sulfur dioxide (SO2)
what happens to 80% of energy fuel contains - answer It is lost to three sources: friction
(drag of the moving parts), heat, and emissions (which is basically energy wasted and
released out of the tailpipe as toxic pollutants).
how much air pollution comes from vehicles - answer the United States Environmental
Protection Agency (EPA) estimates that 20% of all U.S. air pollution is produced by cars
and trucks. In cities, this percentage can rise as high as 90%.
Excessive Hydrocarbons are emitted by vehicles through what two sources -
answerincomplete combustion and fuel evaporation.
Tailpipe Hydrocarbon emissions can be caused by - answerignition system misfiring,
improper ignition timing, rich fuel mixtures, engine mechanical deficiencies, uneven fuel
injector delivery, or anything else that would adversely influence the combustion
process.
Tailpipe Hydrocarbon emissions have been lowered by advances in - answerOn-Board
Diagnostics Second-Generation (OBD-II) systems, computer controls, fuel delivery,
ignition, and emissions systems . HCs emitted by fuel evaporation have also been
drastically reduced through the use of the modern vehicle evaporative emissions
systems (EVAPs)
Carbon Monoxcide (CO) - answercolorless, odorless, and poisonous gas produced by
the incomplete burning of a fuel. Always low on the lean side. created when an engine
burns HC in the presence of O2. formed when there is not enough oxygen (O2) to
support combustion. can't be used to determine anything if an engine is running lean.
provides a great gauge for determining how rich it may be running.
How is CO formed? - answerformed when there is not enough oxygen (O2) to support
combustion. created when an engine burns HC in the presence of O2.
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