WorksheetsDSL-202 Chap 14: Diesel Fuel Properties and Characteristics
Total questions: 20
Worksheet time: 10mins
Technician A says that flash point is the temperature to which fuel must be heated to produce a flammable vapor. Technician B says that if the flash point of fuel is too low, it is prone to accidental ignition. Who is correct?
Technician A
Technician B
Both Technician A and Technician B
Neither Technician A nor Technician B
High levels of sulfur in a diesel fuel can ________.
a. cause corrosion
b. create acids (corrosives)
c. cause components to stick
d. All of the above
Biodiesel should not be stored for more than ________.
a. 1 year
b. 9 months
c. 6 months
d. 3 months
The RFS group is advocating for diesel engine manufacturers to approve the use of what percentage of a biodiesel to petroleum diesel mix?
a. 25%
b. 29%
c. 20%
d. 24%
Which fuel, based on cetane number, will combust sooner?
a. 30
b. 35
c. 40
d. 45
What is the home heating oil grade number set by the ASTM?
a. 2
b. 4
c. 1
d. 5
Technician A says that the typical temperature range at which fuels thicken and no longer flow is 20–30°F below the cloud point. Technician B says at
low temperatures, paraffin wax molecules can clump together, clouding and eventually gelling diesel fuel. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
Which of the following statements is correct with regard to fuel-handling additives?
a. They are primarily for de-icing and pour point depressants
b. They are primarily for smoke suppressants.
c. Both A and B
d. Neither A nor B
Technician A says that less-dense fuel has a lower specific gravity and has less energy content. Technician B says that less-dense fuel has a higher
specific gravity and less energy content. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
Technician A says that a purpose-made fuel hydrometer is used to measure the API number of diesel fuel. Technician B says fuel's API number is
directly related to the fuels grade. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
Technician A says that the only contaminant that will affect the quality of fuel is microorganisms. Technician B says that poor quality fuel will quickly
plug fuel filters and overwhelm the fuel-water separator. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
Which of the following statements is correct with regard to the maintenance of diesel fuel?
a. Petroleum diesel requires maintenance, but biodiesel does not.
b. Biodiesel requires maintenance, but petroleum diesel does not
c. Both A and B
d. Neither A nor B
Technician A says that detergent additives work to dissolve gummy carbon deposits in the fuel system. Technician B says that detergent additives are also used to treat asphaltene. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
Technician A says that diesel engine combustion efficiency is typically less than 75% when using fuel without additives. Technician B says that when
clean, good-quality fuel is used, there is no need to add anything to fuel. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
Transesterification is the removal of glycerin and the addition of ________.
a. alcohol
b. nitrogen
c. biodiesel
d. petroleum diesel
A cetane boosting additive will ________.
a. accelerate ignition point
b. not change ignition point
c. decrease ignition point
d. None of the above
Polymerization of an engine oil involves the ________.
a. addition of polymers
b. gelling of oil
c. removal of polymers
d. soot removal process
Technician A says that biodiesel, when compared to conventional diesel, has reduced emissions across all the indicators. Technician B says that a notable exception to the benefits of biodiesel is it can produce higher levels of NO in some engines. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
Mixing alcohol with diesel fuel will ________.
a. lower the ignition point
b. raise the ignition point
c. not ignite with diesel fuel
d. increase lubricating characteristics
Technician A says that a small amount of gasoline mixed with diesel is still okay to use. Technician B says that provided the mixture is less than 2%, it
is still fine to use. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
