Exam 3: Diesel Engine Emissions

When the _____________ is missing, use an online service or an online maintenance manual from the original equipment manufacturer (OEM) to obtain a list of the required emission equipment.

Which of the following will MOST LIKELY allow soot to leak past the catalyst and into the exhaust?

Technician A says that black smoke from the exhaust of a diesel engine is evidence of particulate emission. Technician B says that black smoke is just soot, which will harmlessly fall to the ground. Who is correct?

Ultrafine particulate is the most hazardous emission because it _____________.

Technician A says the malfunction indicator lamp (MIL) is used only to indicate emission-related faults. Technician says the MIL replaces other warning lamps to indicate any vehicle-related fault B. Who is correct?

Which of the following enables a more efficient engine operation at the cost of more complexity through the use of expensive exhaust system catalysts?

Technician A says that crankcase vapors have oil droplets that categorize the emission as a hydrocarbon (HC). Technician B says that only gases are considered hydrocarbon emissions and oil droplets qualify crankcase emissions as a type of particulate emission. Who is correct?

Diesel's high compression pressure and excess combustion air increases which of the following exhaust emissions?

Tier II standards categorize vehicle emission levels into:

The Tier 3 standards introduced in 2017 closely align with:

Ultra-low-sulfur fuel has been used since 2006 because _____________.

EPA Tier 2 emissions standards used by on-road vehicles up to 14,000 lb gross vehicle weight (GVW) were phased in between:

Which of the following gases is NOT classified as a noxious gaseous emission?

Blowby is classified as:

Diesel engines do not use evaporative emissions controls because ____________.

________ is the area where fuel can hide and lead to improper burning.

Black sooty exhaust smoke is evidence of:

While discussing the reasons for banning diesel engines, technician A says that diesel engines make up only 5% of the vehicles on the road but produce 24% of the transportation emissions, an amount of emissions that is disproportionately higher than what spark-ignition, gasoline-fueled vehicles produce. Technician B says that diesels will produce fewer emissions for every ton of weight hauled compared to spark-ignited, gasoline-fueled engines. Who is correct?

Measurement of engine emissions from a light- or medium-duty diesel to certify its compliance with EPA and EURO standards is ____________.

Beginning in January 2009, which US state was granted a waiver exempting it from US federal emission legislation causing it to enact its own mandatory limits?