Fuel Diesel Test Questions and Answers 2023 with
complete solution
What is the lowest CN value that any #1D or #2D fuel formulated for highway use
can be legally sold at?
40
A disadvantage to biodiesel use is the increase in ____________.
oxides of nitrogen
Which of the following components would be more likely to fail if LS (Low Sulfur)
fuel were used instead of a ULS (Ultra Low Sulfur) fuel in a highway diesel engine
manufactured after 2007?
Diesel particulate filter (DPF)
A fuel with a high ignition temperature will ____________.
combust later
Which fuel has the highest btu output by volume?
2-D ULSD
Oxidized diesel fuel will take on a _________ color.
darker
"Fuel gelling" is also known as ____________.
pour point
Current diesel fuel formulated for on-highway use and classified as Ultra Low
Sulfur (ULS) is required to have what maximum sulfur content?
0.0015%
Which of the following diesel fuels is most commonly used to fuel highway trucks
in North America?
2D clear
Biodiesel advantages include a ____________.
decrease in carbon dioxide
Which fuel, based on cetane number, will combust sooner?
45
Which of the following terms describes the tendency of a liquid to vaporize?
volatility
Fat and waxes present in diesel fuel provide good __________.
.
lubricity
Which of the following terms is used to describe the anti-knock ability of a
gasoline?
octane rating
The insignificant ___________ of diesel fuel excludes it from evaporative
emission strategies.
volatility
Mixing alcohol with diesel fuel will ____________.
absorb and suspend water
Disadvantages to biodiesel use include ____________.
, A. poor infrastructure for distribution
B. filter plugging
C. high manufacturing costs
Diesel fuel additives may include but are not limited to ____________.
A. Cetane booster
B. Biocides
C. De foamers
What is the grade number set by the ASTM for warm climate diesel fuel?
2D
Which of the following values is used to measure the heat energy in a fuel?
BTU
A vacuum valve in a fuel cap lets __________.
air in
Which is the recommended tool when performing primary fuel system
inspection?
Vacuum gauge
Which of the following components would NOT be under suction when the engine
is running?
secondary filter
Diesel low-pressure fuel lines must not be routed __________.
through the cab interior
What would double gasketing of a primary fuel filter most likely cause?
sucking air into fuel
A fuel module may include a ____________.
A. filter
B. hand primer pump
C. fuel heater
The purpose of the primary fuel filter(s) is to protect the __________.
fuel pump
In a typical fuel subsystem, which of the following is capable of entrapping the
smallest particles suspended in the fuel?
secondary filter
A loose primary side fuel fitting will __________.
draw air
The split linkage of a mechanical diaphragm pump operates on a(an)
____________.
eccentric cam lobe
What is the most destructive contaminate within a fuel?
water
Pressure of fuel delivery out of a positive displacement pump increases as
____________.
engine R.P.M increases
What should be used to diagnose an air-in-fuel condition in a diesel fuel sub-
system?
diagnostic sight glass
To measure fuel pump outlet pressure, where is the pressure gauge installed?
complete solution
What is the lowest CN value that any #1D or #2D fuel formulated for highway use
can be legally sold at?
40
A disadvantage to biodiesel use is the increase in ____________.
oxides of nitrogen
Which of the following components would be more likely to fail if LS (Low Sulfur)
fuel were used instead of a ULS (Ultra Low Sulfur) fuel in a highway diesel engine
manufactured after 2007?
Diesel particulate filter (DPF)
A fuel with a high ignition temperature will ____________.
combust later
Which fuel has the highest btu output by volume?
2-D ULSD
Oxidized diesel fuel will take on a _________ color.
darker
"Fuel gelling" is also known as ____________.
pour point
Current diesel fuel formulated for on-highway use and classified as Ultra Low
Sulfur (ULS) is required to have what maximum sulfur content?
0.0015%
Which of the following diesel fuels is most commonly used to fuel highway trucks
in North America?
2D clear
Biodiesel advantages include a ____________.
decrease in carbon dioxide
Which fuel, based on cetane number, will combust sooner?
45
Which of the following terms describes the tendency of a liquid to vaporize?
volatility
Fat and waxes present in diesel fuel provide good __________.
.
lubricity
Which of the following terms is used to describe the anti-knock ability of a
gasoline?
octane rating
The insignificant ___________ of diesel fuel excludes it from evaporative
emission strategies.
volatility
Mixing alcohol with diesel fuel will ____________.
absorb and suspend water
Disadvantages to biodiesel use include ____________.
, A. poor infrastructure for distribution
B. filter plugging
C. high manufacturing costs
Diesel fuel additives may include but are not limited to ____________.
A. Cetane booster
B. Biocides
C. De foamers
What is the grade number set by the ASTM for warm climate diesel fuel?
2D
Which of the following values is used to measure the heat energy in a fuel?
BTU
A vacuum valve in a fuel cap lets __________.
air in
Which is the recommended tool when performing primary fuel system
inspection?
Vacuum gauge
Which of the following components would NOT be under suction when the engine
is running?
secondary filter
Diesel low-pressure fuel lines must not be routed __________.
through the cab interior
What would double gasketing of a primary fuel filter most likely cause?
sucking air into fuel
A fuel module may include a ____________.
A. filter
B. hand primer pump
C. fuel heater
The purpose of the primary fuel filter(s) is to protect the __________.
fuel pump
In a typical fuel subsystem, which of the following is capable of entrapping the
smallest particles suspended in the fuel?
secondary filter
A loose primary side fuel fitting will __________.
draw air
The split linkage of a mechanical diaphragm pump operates on a(an)
____________.
eccentric cam lobe
What is the most destructive contaminate within a fuel?
water
Pressure of fuel delivery out of a positive displacement pump increases as
____________.
engine R.P.M increases
What should be used to diagnose an air-in-fuel condition in a diesel fuel sub-
system?
diagnostic sight glass
To measure fuel pump outlet pressure, where is the pressure gauge installed?
