310T fuel systems exam questions |\ |\ |\ |\ |\
with answers |\
Technician A says that EUIs are better than previous injectors
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
because they have no injection lag caused by swelling pump lines
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
and delivery valves. Technician B says that the use of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
electromagnetic solenoids by unit injectors produces injection delay.|\ |\ |\ |\ |\ |\ |\
Who is correct?
|\ |\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔b. Technician B |\ |\
Technician A says that when setting unit injector adjustments
|\ |\ |\ |\ |\ |\ |\ |\ |\
during replacement, tune-up, or overhaul, the proper operating
|\ |\ |\ |\ |\ |\ |\ |\
clearance should be adjusted using the rocker arm adjusting screw.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
Technician B says that unit injectors do not use operating clearances
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
and only injector preload is set on the injector's adjuster spring.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
|\ Who is correct?
|\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
,c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔b. Technician B |\ |\
Technician A says that injection spray-in pressure from a unit
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
injector can change with engine speed. Technician B says spray-in
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pressures depend only on a EUI's nozzle opening pressure.
|\ |\ |\ |\ |\ |\ |\ |\ |\
Who is correct?
|\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔a. Technician A |\ |\
Technician A says that the electrical signal to a EUI injector is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pulse-width modulated (PWM), but unlike other PWM signals it
|\ |\ |\ |\ |\ |\ |\ |\ |\
does not have a duty cycle. Technician B says the electrical signal is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
DC current. Who is correct?
|\ |\ |\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
,Technician A says that an electromagnetic solenoid limits the
|\ |\ |\ |\ |\ |\ |\ |\ |\
number of injection events of most styles of unit injectors to one
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
main injection. Technician B says that some unit injectors are
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
capable of having pilot injection events. Who is correct?
|\ |\ |\ |\ |\ |\ |\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
Technician A says that secondary filters used by EUI fuel systems
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
filter down to 2 microns. Technician B says that secondary fuel
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
filters used by EUI fuel systems filter 10-20 microns.
|\ |\ |\ |\ |\ |\ |\ |\
|\ Who is correct?
|\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔a. Technician A|\ |\
Technician A says that in the latest EUIs, the fuel control valves
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
control injection timing and meter the correct quantity of fuel for
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
, injection. Technician B says that injection pressure and timing are
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
controlled by the valves. |\ |\ |\ |\
Who is correct?
|\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔b. Technician B|\ |\
While discussing the installation procedures for a EUI, Technician
|\ |\ |\ |\ |\ |\ |\ |\ |\
A says that the plunger travel of the injector is one of the last steps
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
to perform during injector replacement. Technician B says that the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
coil resistance and available voltage should be checked after
|\ |\ |\ |\ |\ |\ |\ |\ |\
replacing the injector. |\ |\ |\
Who is correct?
|\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔a. Technician A|\ |\
While discussing potential reasons for a hard start and prolonged
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
engine cranking period on a EUI fuel system, Technician A
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
with answers |\
Technician A says that EUIs are better than previous injectors
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
because they have no injection lag caused by swelling pump lines
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
and delivery valves. Technician B says that the use of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
electromagnetic solenoids by unit injectors produces injection delay.|\ |\ |\ |\ |\ |\ |\
Who is correct?
|\ |\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔b. Technician B |\ |\
Technician A says that when setting unit injector adjustments
|\ |\ |\ |\ |\ |\ |\ |\ |\
during replacement, tune-up, or overhaul, the proper operating
|\ |\ |\ |\ |\ |\ |\ |\
clearance should be adjusted using the rocker arm adjusting screw.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
Technician B says that unit injectors do not use operating clearances
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
and only injector preload is set on the injector's adjuster spring.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
|\ Who is correct?
|\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
,c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔b. Technician B |\ |\
Technician A says that injection spray-in pressure from a unit
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
injector can change with engine speed. Technician B says spray-in
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pressures depend only on a EUI's nozzle opening pressure.
|\ |\ |\ |\ |\ |\ |\ |\ |\
Who is correct?
|\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔a. Technician A |\ |\
Technician A says that the electrical signal to a EUI injector is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pulse-width modulated (PWM), but unlike other PWM signals it
|\ |\ |\ |\ |\ |\ |\ |\ |\
does not have a duty cycle. Technician B says the electrical signal is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
DC current. Who is correct?
|\ |\ |\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
,Technician A says that an electromagnetic solenoid limits the
|\ |\ |\ |\ |\ |\ |\ |\ |\
number of injection events of most styles of unit injectors to one
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
main injection. Technician B says that some unit injectors are
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
capable of having pilot injection events. Who is correct?
|\ |\ |\ |\ |\ |\ |\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
Technician A says that secondary filters used by EUI fuel systems
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
filter down to 2 microns. Technician B says that secondary fuel
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
filters used by EUI fuel systems filter 10-20 microns.
|\ |\ |\ |\ |\ |\ |\ |\
|\ Who is correct?
|\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔a. Technician A|\ |\
Technician A says that in the latest EUIs, the fuel control valves
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
control injection timing and meter the correct quantity of fuel for
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
, injection. Technician B says that injection pressure and timing are
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
controlled by the valves. |\ |\ |\ |\
Who is correct?
|\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔b. Technician B|\ |\
While discussing the installation procedures for a EUI, Technician
|\ |\ |\ |\ |\ |\ |\ |\ |\
A says that the plunger travel of the injector is one of the last steps
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
to perform during injector replacement. Technician B says that the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
coil resistance and available voltage should be checked after
|\ |\ |\ |\ |\ |\ |\ |\ |\
replacing the injector. |\ |\ |\
Who is correct?
|\ |\
a. Technician A
|\ |\
b. Technician B
|\ |\
c. Both Technician A and Technician B
|\ |\ |\ |\ |\ |\
d. Neither Technician A nor Technician B - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔a. Technician A|\ |\
While discussing potential reasons for a hard start and prolonged
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
engine cranking period on a EUI fuel system, Technician A
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
