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Exhaust gas recirculation: Quiz


Question 1: Although deleting the EGR system results in increased NOx level hydrocarbon emissions, Particulates, Carbon monoxide and ________ are drastically reduced.
Carbon sinkCarbon dioxideCarbon cycleGreenhouse gas

Question 2: The increased level of soot also creates the need for ________ to prevent environmental contamination.
Diesel particulate filterMexico CityAir pollutionCatalytic converter

Question 3: Early (1970s) EGR systems were unsophisticated, utilizing ________ as the only input to an on/off EGR valve; reduced performance and/or drivability were common side effects.
Manifold vacuumThrottleManifold (automotive)Carburetor

Question 4: In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (________) emissions reduction technique used in most petrol/gasoline and diesel engines.
Nitrous oxideNitric oxideOzoneNitrogen oxide

Question 5: The exhaust gas, added to the fuel, oxygen, and combustion products, increases the specific heat capacity of the cylinder contents, which lowers the ________.
CarbonHydrogenMethaneAdiabatic flame temperature

Question 6: In modern ________, the EGR gas is cooled through a heat exchanger to allow the introduction of a greater mass of recirculated gas.
Two-stroke engineInternal combustion engineDiesel engineHot bulb engine

Question 7: However, exhaust gas (largely carbon dioxide and water vapor) has a higher ________ than air, and so it still serves to lower peak combustion temperatures.
OxygenHydrogenIronSpecific heat capacity


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