Exam 3: Diesel Engine Emissions

The latest EPA standard is called:

Which of the following exhausts, which is so ultrafine and microscopic in size that it is not even visible to the eye, makes up the largest proportion?

Which of the following is a hydrocarbon counted in the measurement of an engine's total hydrocarbon emissions?

How many sets of emission regulations are used in the US?

During which of the following conditions are the highest NOx levels are produced?

Research has discovered that close to 50% of HC emissions from diesels can originate from the fuel trapped in the __________ area.

Technician A says that carbon monoxide (CO) emissions are higher from diesel engines than from gasoline engines. Technician B says that diesel engines produce little or no carbon monoxide gas compared to gasoline engines. Who is correct?

What system is required for diesel engines to meet standards effectively and cost-effectively?

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

During an opacity text, when exhaust smoke is just visible, opacity corresponds to approximately:

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?

The use of which fuel can reduce CO₂ emissions by more than 70%?

Technician A says that diesel vehicles produced fewer emissions for every ton of weight transported per mile. Technician B says that diesels carry much higher loads and travel much farther using less fuel. Who is right?

Technician A says that diesel engine crankcase vapors are made up primarily of air leaking past the pistons rings and can be vented directly to the atmosphere since it has no hydrocarbon or fuel in the air. Technician B says that crankcase vapors are classified as particulate emissions and are not vented to the atmosphere on late-model engines. Who is correct?

Technician A says that high crevice volume in a diesel engine is responsible for producing excessive amounts of particulate emissions. Technician B says that high crevice volume produces excessive amounts of NOx emissions. Who is correct?

Which of the following refers to all forms of emissions existing as either a solid or liquid but not a gas?

What type of particulate is formed primarily because diesel fuel burns from the outside inward?

The 2018 emission-monitoring system responsible for detecting potential faults that could cause light- and medium-duty diesel emissions to rise above maximum legislated levels is known as _______________.

During an opacity text, you have an observer examine the exhaust plume against a light-colored background or:

Two technicians are describing measuring opacity. Technician A says that you use a chart to match the darkness of the exhaust plume against an appropriate scale-measuring opacity and record the results. Technician B says that visible exhaust smoke for more than 30 seconds over a 1-minute period indicates a major defect in the engine combustion system. Who is right?