Question 1

In what MY did single actuator EUIs cease to be used on any North American, Highway certified diesel engine?

Accepted Answer

A)   1997
B)   2003
C)   2007
D)   2010

Question 2

Besides identifying a dead cylinder, what else can a multi-cylinder cutout test identify after performing a cylinder cutout test?

Accepted Answer

A)   emissions analysis
B)   cold engine operation
C)   unbalanced cylinder fueling
D)   all of the above

Question 3

What type of transfer pump is used in the fuel sub-system in most EUI-fueled engines?

Accepted Answer

A)   fixed clearance gear pump
B)   helical gear pump
C)   plunger pump
D)   vane type pump

Question 4

What pressure is used to charge Cummins CELECT Plus injectors?

Accepted Answer

A)   they are under suction
B)   78 psi
C)   150 psi
D)   285 psi

Question 5

What does the injector response time (IRT)  allow DDEC electronics to do when managing EUI pulse width?

Accepted Answer

A)   compensate for minor EUI circuit resistances
B)   adjust for EUI mechanical wear
C)   compensate for a failed EUI control cartridge
D)   adjust EUI firing sequence

Question 6

What force is used to convert charging pressures into injection pressures in EUIs?

Accepted Answer

A)   electronic from control cartridge
B)   electrical from injector drivers
C)   hydraulic from fuel sub-system
D)   mechanical from injector cam profile

Question 7

Which domestic engine manufacturers of onhighway commercial diesel engines are using single-actuator EUIs after the EPA 2007 model year?

Accepted Answer

A)   DDC only
B)   Volvo-Mack only
C)   Caterpillar only
D)   None

Question 8

What does the control cartridge mechanically move to manage an effective stroke in a single-actuator EUI?

Accepted Answer

A)   pumping plunger
B)   barrel
C)   nozzle needle
D)   poppet control valve

Question 9

Which of the following terms used by DDC to describe DDEC EUI fueling has the same meaning as split shot injection?

Accepted Answer

A)   pilot injection
B)   detonation
C)   quiescent combustion
D)   maximizing injection pressure

Question 10

What electronic component houses the electronic distributor unit (EDU)  in versions of DDEC fueled engines manufactured before 2007?

Accepted Answer

A)   ECM
B)   PCM
C)   MCM
D)   CPC

Question 11

When the control cartridge is energized in a typical single actuator EUI, which of the following passages is immediately closed off?

Accepted Answer

A)   cylinder head return gallery
B)   EUI pump chamber to nozzle duct
C)   nozzle valve pressure chamber
D)   EUI control valve spill

Question 12

When a typical EUI is managing pilot injection, when should the second pulse begin?

Accepted Answer

A)   at 15 degrees ATDC
B)   the moment the pilot pulse ignites
C)   peak cylinder pressure
D)   during afterburn B

Question 13

How is EUI duty cycle usually displayed on electronic service tools (ESTs) ?

Accepted Answer

A)   crank angle degrees
B)   pulse width (PW) 
C)   on-off duration
D)   cubic mm of fuel pumped

Question 14

Which of the following must happen to enable an EUI to no-fuel, and therefore shutdown, an engine?

Accepted Answer

A)   EUI solenoid not be energized
B)   no plunger stroke
C)   camshaft does not ramp off IBC
D)   camshaft ceases to rotate A

Question 15

If an injector calibration code is inscribed as A, B, or C, what is the likely engine application of the EUI?

Accepted Answer

A)   1st generation DDEC
B)   Late generation DDEC
C)   1st generation Volvo
D)   Late generation Caterpillar

Question 16

When a four-cylinder cutout test is being performed on an engine, what is the minimum number of cylinders that should be firing during the test cycles if all the EUIs are functioning properly?

Accepted Answer

A)   One cylinder
B)   Two cylinders
C)   Four cylinders
D)   Six cylinders

Question 17

What voltage are Cummins CELECT EUIs switched at?

Accepted Answer

A)   5 V-DC
B)   12 V-DC
C)   78 V-DC
D)   100 V-DC C

Question 18

Where do Caterpillar usually locate a hand priming pump in their EUI-fueled engine?

Accepted Answer

A)   on the secondary filter housing
B)   at the fuel tank pick-up tube
C)   at the gear pump inlet
D)   on the primary filter housing

Question 19

Technician A says that to program EUI fuel flow rates to an ECM, some engines require a new engine file to be downloaded from the OEM data huB. echnician B says that failure to reprogram the calibration code on injector change-out is unlikely to cause any harm providing the engine runs smooth at idle after start-up. Who is correct?

Accepted Answer

A)   Technician A only
B)   Technician B only
C)   Both A and B
D)   Neither A nor B

Question 20

When Caterpillar single actuator MEUIs are energized by the ECM drivers, voltage peaks at:

Accepted Answer

A)   5 V-DC
B)   8 V-DC
C)   12 V-DC
D)   over 100 V-DC

Exam 25: Single-Actuator Eui Systems

In what MY did single actuator EUIs cease to be used on any North American, Highway certified diesel engine?

Correct Answer
verified

Besides identifying a dead cylinder, what else can a multi-cylinder cutout test identify after performing a cylinder cutout test?

Correct Answer
verified

What type of transfer pump is used in the fuel sub-system in most EUI-fueled engines?

Correct Answer
verified

What pressure is used to charge Cummins CELECT Plus injectors?

Correct Answer
verified

What does the injector response time (IRT) allow DDEC electronics to do when managing EUI pulse width?

Correct Answer
verified

What force is used to convert charging pressures into injection pressures in EUIs?

Correct Answer
verified

Which domestic engine manufacturers of onhighway commercial diesel engines are using single-actuator EUIs after the EPA 2007 model year?

Correct Answer
verified

What does the control cartridge mechanically move to manage an effective stroke in a single-actuator EUI?

Correct Answer
verified

Which of the following terms used by DDC to describe DDEC EUI fueling has the same meaning as split shot injection?

Correct Answer
verified

What electronic component houses the electronic distributor unit (EDU) in versions of DDEC fueled engines manufactured before 2007?

Correct Answer
verified

When the control cartridge is energized in a typical single actuator EUI, which of the following passages is immediately closed off?

Correct Answer
verified

When a typical EUI is managing pilot injection, when should the second pulse begin?

Correct Answer
verified
B

How is EUI duty cycle usually displayed on electronic service tools (ESTs) ?

Correct Answer
verified

Which of the following must happen to enable an EUI to no-fuel, and therefore shutdown, an engine?

Correct Answer
verified
A

If an injector calibration code is inscribed as A, B, or C, what is the likely engine application of the EUI?

Correct Answer
verified

When a four-cylinder cutout test is being performed on an engine, what is the minimum number of cylinders that should be firing during the test cycles if all the EUIs are functioning properly?

Correct Answer
verified

What voltage are Cummins CELECT EUIs switched at?

Correct Answer
verified
C

Where do Caterpillar usually locate a hand priming pump in their EUI-fueled engine?

Correct Answer
verified

Correct Answer
verified

When Caterpillar single actuator MEUIs are energized by the ECM drivers, voltage peaks at:

Correct Answer
verified

Exam 25: Single-Actuator Eui Systems

In what MY did single actuator EUIs cease to be used on any North American, Highway certified diesel engine?

Correct AnswerverifiedShow Answer

Besides identifying a dead cylinder, what else can a multi-cylinder cutout test identify after performing a cylinder cutout test?

Correct AnswerverifiedShow Answer

What type of transfer pump is used in the fuel sub-system in most EUI-fueled engines?

Correct AnswerverifiedShow Answer

What pressure is used to charge Cummins CELECT Plus injectors?

Correct AnswerverifiedShow Answer

What does the injector response time (IRT) allow DDEC electronics to do when managing EUI pulse width?

Correct AnswerverifiedShow Answer

What force is used to convert charging pressures into injection pressures in EUIs?

Correct AnswerverifiedShow Answer

Which domestic engine manufacturers of onhighway commercial diesel engines are using single-actuator EUIs after the EPA 2007 model year?

Correct AnswerverifiedShow Answer

What does the control cartridge mechanically move to manage an effective stroke in a single-actuator EUI?

Correct AnswerverifiedShow Answer

Which of the following terms used by DDC to describe DDEC EUI fueling has the same meaning as split shot injection?

Correct AnswerverifiedShow Answer

What electronic component houses the electronic distributor unit (EDU) in versions of DDEC fueled engines manufactured before 2007?

Correct AnswerverifiedShow Answer

When the control cartridge is energized in a typical single actuator EUI, which of the following passages is immediately closed off?

Correct AnswerverifiedShow Answer

When a typical EUI is managing pilot injection, when should the second pulse begin?

Correct AnswerverifiedB

How is EUI duty cycle usually displayed on electronic service tools (ESTs) ?

Correct AnswerverifiedShow Answer

Which of the following must happen to enable an EUI to no-fuel, and therefore shutdown, an engine?

Correct AnswerverifiedA

If an injector calibration code is inscribed as A, B, or C, what is the likely engine application of the EUI?

Correct AnswerverifiedShow Answer

When a four-cylinder cutout test is being performed on an engine, what is the minimum number of cylinders that should be firing during the test cycles if all the EUIs are functioning properly?

Correct AnswerverifiedShow Answer

What voltage are Cummins CELECT EUIs switched at?

Correct AnswerverifiedC

Where do Caterpillar usually locate a hand priming pump in their EUI-fueled engine?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When Caterpillar single actuator MEUIs are energized by the ECM drivers, voltage peaks at:

Correct AnswerverifiedShow Answer

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B

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A

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C

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