ADVANCED DIESEL MIDTERM EXAM: A+ GRADED GUIDE WITH
THE LATEST KEY QUESTIONS AND ANSWERS.
Which was the first computer controlled, truck diesel engine to be manufactured
in North America?
DDC Series 92 DDEC I
2. What is the displacement of the post-2007, DDC EUI-fueled Series 60 engine?
14 L
3. How is fuel delivered from the cylinder head fuel galleries to the electronic unit
injectors (EUIs) in a typical EUI-fueled diesel engine?
Bore in the head.
4. What force is used to convert charging pressures into injection pressures in
EUIs?
Mechanical from injector cam profile
What mechanical feature defines the limits within which EUI fuel pulse width (PW)
must take place?
injector cam profile
6. Which of the following is NOT an advantage of pilot injection?
dumps fuel in the cylinder
7. What does the injector response time (IRT) allow DDEC electronics to do when
managing EUI pulse width?
compensate for minor EUI circuit resistances
8. When a single-cylinder cutout test is being performed on a typical EUI-fueled
engine with the objective of identifying a dead cylinder, what happens to mean
(average) PW when the EUI over the dead cylinder is cut?
PW does not change
9. What is the acronym Caterpillar use to describe their EUIs?
MEUI
10. Identify the ACERT equipped engine in the list below:
DO NOT HAVE A HYPHEN BETWEEN THE C AND THE DISPLACEMENT
, 11. What type of transfer pump is used in the fuel sub-system in most EUI-fueled
engines?
fixed clearance gear pump
12. Which of the following must happen to enable an EUI to no-fuel, and therefore
shutdown, an engine?
Ecm does not command injector to hold fuel
13. Which of the following determines the length of a plunger effective stroke in a
single actuator EUI?
time EUI control solenoid is energized
14. Which of the following values is a typical of NOP of most 2-terminal EUIs?
5,000 psi
15. When the control cartridge is energized in a typical single actuator EUI, which
of the following passages is immediately closed off?
EUI control valve spill
16. When Caterpillar single actuator MEUIs are energized by the ECM drivers,
voltage peaks at:
over 100 V-DC
17. What voltage are DDEC single actuator EUIs switched at?
12 V
18. What voltage are Cummins CELECT EUIs swithed at?
78 V-DC
19. Which of the following values represents a typical charging pressure in EUI-
fueled engines built before 2007?
60 to 150 PSI
What does the control cartridge mechanically move to manage an effective stroke
in a single-actuator EUI?
It opens and closes the spill valve actuator
21. What pressure is used to charge Cummins CELECT Plus injectors?
150 psi
22. Which of the following describes the role of fuel that enters the timing
chamber in a CELECT Plus injector?
THE LATEST KEY QUESTIONS AND ANSWERS.
Which was the first computer controlled, truck diesel engine to be manufactured
in North America?
DDC Series 92 DDEC I
2. What is the displacement of the post-2007, DDC EUI-fueled Series 60 engine?
14 L
3. How is fuel delivered from the cylinder head fuel galleries to the electronic unit
injectors (EUIs) in a typical EUI-fueled diesel engine?
Bore in the head.
4. What force is used to convert charging pressures into injection pressures in
EUIs?
Mechanical from injector cam profile
What mechanical feature defines the limits within which EUI fuel pulse width (PW)
must take place?
injector cam profile
6. Which of the following is NOT an advantage of pilot injection?
dumps fuel in the cylinder
7. What does the injector response time (IRT) allow DDEC electronics to do when
managing EUI pulse width?
compensate for minor EUI circuit resistances
8. When a single-cylinder cutout test is being performed on a typical EUI-fueled
engine with the objective of identifying a dead cylinder, what happens to mean
(average) PW when the EUI over the dead cylinder is cut?
PW does not change
9. What is the acronym Caterpillar use to describe their EUIs?
MEUI
10. Identify the ACERT equipped engine in the list below:
DO NOT HAVE A HYPHEN BETWEEN THE C AND THE DISPLACEMENT
, 11. What type of transfer pump is used in the fuel sub-system in most EUI-fueled
engines?
fixed clearance gear pump
12. Which of the following must happen to enable an EUI to no-fuel, and therefore
shutdown, an engine?
Ecm does not command injector to hold fuel
13. Which of the following determines the length of a plunger effective stroke in a
single actuator EUI?
time EUI control solenoid is energized
14. Which of the following values is a typical of NOP of most 2-terminal EUIs?
5,000 psi
15. When the control cartridge is energized in a typical single actuator EUI, which
of the following passages is immediately closed off?
EUI control valve spill
16. When Caterpillar single actuator MEUIs are energized by the ECM drivers,
voltage peaks at:
over 100 V-DC
17. What voltage are DDEC single actuator EUIs switched at?
12 V
18. What voltage are Cummins CELECT EUIs swithed at?
78 V-DC
19. Which of the following values represents a typical charging pressure in EUI-
fueled engines built before 2007?
60 to 150 PSI
What does the control cartridge mechanically move to manage an effective stroke
in a single-actuator EUI?
It opens and closes the spill valve actuator
21. What pressure is used to charge Cummins CELECT Plus injectors?
150 psi
22. Which of the following describes the role of fuel that enters the timing
chamber in a CELECT Plus injector?
