Exam 18: Diesel Fuel Characteristics

Technician A says that ULS is now mandatory for all on-highway diesel engine applications. Technician B says that ULS is now mandatory for all off-highway mobile diesel engines. Who is correct?

What substance is commonly added to truck diesel fuel tanks to prevent winter freeze up?

What is the source of 60% of the energy consumed in North America?

Which of the following would be a typical specific gravity rating of a #2D diesel fuel?

Which organization is responsible for classifying diesel fuel to a standard?

What is the maximum sulfur content in a diesel fuel classified as ultralow sulfur (ULS) in North America?

Technician A says that fuel costs are second only to tires when reviewing the operating expenses of trucks on our highways. Technician B says that as fuel costs rise, this provides a competitive advantage to large fleets over individual-owner operators. Who is correct?

What is the specific gravity at 15 degrees Celsius of a diesel fuel with an API gravity of 37 degrees?

Which of the following values is used to measure the heat energy (calorific value) in a fuel?

A substance that enables a chemical reaction without itself undergoing any change is known as a:

Which of the following terms describes the amount of heat energy in a fuel?

Technician A says that biodiesel has a short shelf life compared with petroleum sourced diesel fuel. Technician B says that degraded biodiesel can result in costly fuel problems. Who is correct?

Which of the following terms is used to describe the anti-knock ability of a gasoline?

Which is the most efficient method of separating the highest fractions found in crude petroleum?

Technician A says that diesel fuel in a vehicle tank can degrade when exposed to high temperatures. Technician B says that the most volatile fractions in a diesel fuel are the ones that define the CN of the fuel. Who is correct?

What is the lowest CN value that any #1D or #2D fuel formulated for highway use can be legally sold at?

Which of the following acronyms defines the ignition quality of a diesel fuel?

What is the main ingredient found in a diesel fuel conditioner?

Which of the following terms describes the tendency of a liquid to vaporize?

Which of the following acronyms is commonly used to describe the actual ratio of fuel and air in a combustion reaction?