Exam 49: Emissions Management

When the term legacy truck is used by the trucking industry with reference to tailpipe emissions, what is being referred to??

Technician A says that when fuel is being dosed to a DPF, the unit is being passively regenerated. Technician B says that when fuel is being dosed to a DPF, the unit is being actively regenerated. Who is correct?

Technician A says that carbon dioxide is classified as a greenhouse gas (GHG). Technician B says that water vapor produced by combusting HC fuel is not classified as a GHG because it is harmless. Who is right?

Technician A says that SCR systems use DEF which results in toxic levels of ammonia being emitted from the tailpipe. Technician B says that Navistar engines certified for EPA MY 2013 and later use SCR systems. Who is correct??

If theoretically perfect combustion takes place in an engine cylinder using a diesel fuel, what should result from the reaction out the tailpipe?

Which of the following is a key to reducing carbon dioxide emissions from the combustion of diesel fuel?

Which of the following is a component of the EPA Highway Rule regulation schedule for implementation by MY 2027?

Which of the following is another term used to describe the aqueous urea solution known as DEF?

Which city in the United States has been noted to have a major problem with photochemical smog?

Which of the following tailpipe emissions were in 2008 been classified by the Supreme Court as a pollutant?

?When the term new technology diesel engine (NTDE) is used in the context of a highway compliant diesel, to what does it refer?

What percentage of urea is contained in the aqueous urea solution known as diesel exhaust fluid (DEF)?

What do some current engines use to assist closed crankcase ventilation (CCV) emissions?

Which federal agency is responsible for certifying any new commercial vehicle diesel engine before it can be operated on our highways?

A chemical process initiated by the absorption of light is known as what type of reaction?

Which component in photochemical smog is known to be highly toxic in low concentrations?

Which of the following is NOT true of carbon monoxide?

Who regulates and sets emissions certification standards for highway diesel engine emissions in the state of California?

What is the source of most VOCs (volatile organic compounds) emitted from an on-highway vehicle?

Which of the following exhaust aftertreatment devices have been proven to significantly lower NOx emissions in highway diesel engines?