Week #5 - Basic Fuel Systems Flashcards
True or False: DEF is available at most diesel refueling stations.
True
The theory that explains the atomic differences in the three states of matter is known as what?
Kinetic molecular theory
Calculate the stoichiometric requirement of a fuel composed of 84% carbon, 15% hydrogen, and 1% sulfur when combusted in ambient air.
14.96: 1
An injector spring in a hydraulic injector nozzle that is fatigued would likely produce which of the following conditions?
a. Nozzle chatter
b. Lower NOP and advanced injection timing
c. Higher NOP
d. Higher NOP retarded injection timing
b. Lower NOP and advanced injection timing
In which engine position does the crank throw provide the least amount of leverage?
a. 15 degrees ATDC
b. 90 degrees ATDC
c. BDC
d. TDC
d. TDC
True or False: Diesel fuel tends to be more volatile than gasoline.
False
Which of the following solutions would provide the highest level of antifreeze protection?
a. A 100% solution of PG
b. A 100% solution of EG
c. A 50/50 solution of EG and distilled water
d. Pure distilled water
c. A 50/50 solution of EG and distilled water
True or False: EG is always colored green.
False
Which of the following specific gravity values would correspond to that of a typical #2D diesel fuel?
a. 0.840
b. 0.710
c. 1.170
d. 0.970
b. 0.840
Atomized droplets are in a gaseous state.
False
When attempting to cold-start an electronically controlled diesel engine in subzero (lower than -70 degrees C) conditions, which of the following would provide the most help?
a. Smaller than normal fuel droplet sizing
b. Larger than normal fuel droplet sizing
c,. Pushing the accelerator to the floor
d. Substantial advance to injection timing
a. Smaller than normal fuel droplet sizing
True or False: Some water-separator units use a centrifuge to separate water from fuel.
True
True or False: The end products of both an explosion and a combustion reaction are similar.
True
True or False: The laws of thermodynamics dictate that a catalytic reaction must involve a change in the state of the catalyst.
False
True or False: The stoichiometric requirement of a diesel fuel ranges between 14.5:1 and 15.1:1.
True
True or False: All #1D and #2D fuels must be sold with a CN number of exactly 40.
False
True or False: At refueling on the completion of a journey, fuel is steaming in the tanks. This condition is a result of normal operation in some fuel systems.
True
True or False: Injector nozzles used on pre-2007 EUIs and HEUIs use the same operating principles as those on any hydraulic pump-line-nozzle system.
True
The most abundant element found in the known universe is what?
Hydrogen
True or False: The degree of atomization is controlled by managing injection pressure.
True
True or False: Most commercial truck diesel engines use a vane-type transfer pump located in the fuel tank to pump fuel to the transfer pump.
False
True or False: Denser fractions of crude petroleums tend to command higher prices than lighter fractions.
False
True or False: An isochronous governor is normally used to manage a genset.
True
How many protons would a balanced atom of oxygen contain?
8