Exam 3: Diesel Engine Emissions

Technician A says that creating clean diesel engines has resulted in diesel engines using more fuel with less power output compared to older engines. Technician B says that even the latest engine technology will not enable diesels to operate as cleanly as spark-ignited gasoline-fueled engines. Who is correct?

Technician A says that blowby is as noxious from a diesel engine as it is from a spark-ignited gasoline-fueled engine. Technician B says that crankcase controls for diesel engines involve recirculating the crankcase vapors back into the intake air inlet. Who is right?

Which two emissions from engines are required to create smog?

Regulating ______ emissions lagged because emissions from this area of the engine are relatively minimal in comparison to gasoline engines.

Two technicians are describing OBD II monitors. Technician A says that the comprehensive component monitor (CCM) is not part of the OBD-II system because it only monitors electrical circuits. Technician B says that CCMs are required to monitor output components for functional faults. Who is right?

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 is NOT a common cause of HC emissions?

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

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

PM-10 is particulate matter that is:

What are the gases produced when nitrogen reacts with oxygen under high-temperature and high-pressure conditions during combustion called?

Categories of noxious emissions are referred to as regulated emissions because they __________

What is the fuel economy mpg for combined cars and light trucks in 2024 as established by the Environmental Protection Agency (EPA)?

Technician A says that diesel exhaust has a noxious portion that is 5 to 10 times greater than the noxious component of spark-ignited, gasoline-fueled engines. Technician B says that the noxious portion of diesel exhaust is many times smaller than the noxious portion of spark-ignited, gasoline-fueled engines. Who is correct?

What is the EPA Tier 2 Bin 5 standard for hydrocarbons for a durability of 50,000 miles or 5 years?

To ensure compliance with legislated emissions standards, the CARB began developing regulations in _____ that required vehicles sold in California to use a diagnostic system to detect emission-related failures.

While discussing greenhouse gas (GHG) emissions and diesels, Technician A says that carbon dioxide emissions are regulated through fuel economy standards. Technician B says that there are no direct carbon dioxide (CO₂) standards in North America for diesel-powered vehicles. Who is correct?

In which of the following categories of emissions do crankcase emissions belong?

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

The useful life requirement for a light-duty 2018 diesel is ___________.