Week 2 Emission Test

Diesel emission standards were not established until the __________.

• 1970's

• 1980's

• 1990's

• 2000's

Modern diesels emit close to __________ emissions.

• 10 parts per million (PPM)

• 15 parts per million (PPM)

• 20 parts per million (PPM)

• Zero

On- and off-highway vehicle emissions from the 1970s to present have been reduced by __________.

• 27%

• 13%

• 29%

• 39%

Technician A says legal emissions standards aim to reduce and eliminate the production of noxious substances from all internal combustion engines, except diesel-powered vehicles. Technician B says today's diesel engines also must comply with standards to reduce emissions. Who is correct?

• Tech A

• Tech B

• Both Techs

• Neither Tech

Technician A says hydrocarbon emissions are formed as a result of fuel that have been burned completely. Technician B says fuels are classified ashydrocarbons because they are made of mostly hydrogen and carbon atoms. Who is correct?

• Tech A

• Tech B

• Both Techs

• Neither Tech

Volatile organic compounds (VOCs) enter our atmosphere through evaporative emissions from hydrocarbon-based fuels. The chemical reaction creates__________.

• Ozone

• Nitrogen

• Carbon

• Particulate

Which of the following statements about carbon monoxide is correct?

• Carbon monoxide is created as a result of incomplete combustion of carbon-based fuels.

• Higher compression pressures and excess air used in diesel combustion limit carbon monoxide formation in diesels.

• Both A and B

• Neither A nor B

Which of the following statements about sulfates is correct?

• When diesel fuel is refined from petroleum oil that is pumped from the ground, varying quantities of sulfur naturally combine with oil.

• Burning sulfur contained in fuel produces sulfate (SO

• Both A and B

• Neither A nor B

Technician A says blow-by is the leakage of air past the piston rings into the crankcase. Technician B says that in any engine, blow-by occurs mostlyduring the compression stroke. Who is correct?

• Tech A

• Tech B

• Both Techs

• Neither Tech

Low combustion temperatures and pressure, lack of oxygen, or insufficient burn time typically contribute to which emission?

• Carbon monoxide

• Carbon dioxide

• Oxides of nitrogen

• None of these is correct.