Question 1

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

Question 2

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

Question 3

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

Question 4

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

Question 5

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

Question 6

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

Question 7

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

Question 9

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

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

Question 11

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

Question 12

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

Question 13

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 
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 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 19

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

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

Exam 25: Single-Actuator Eui Systems

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

What voltage are Cummins CELECT EUIs switched at?

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

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

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

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

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

What pressure is used to charge Cummins CELECT Plus injectors?

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

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

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

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

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

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

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

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

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?

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

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

Introduction

Hand and Shop Tools, Precision Tools, and Units of Measurement

Personal and Safety Awareness

Engine Basics

History of the Heat Engine

Power

Engine Powertrain Components

Engine Feedback Assembly

Engine Housing Components

Engine Lubrication Systems

Engine Cooling Systems

Engine Breathing

Engine Retarders

Servicing and Maintenance

Engine Removal, Disassembly, Cleaning,

Diesel Engine Run- in and Performance Testing

Chemistry and Combustion

Diesel Fuel Characteristics

Fuel Subsystems

Fuel Injection Basics and Governor Principles

Injector Nozzles

Port-Helix Metering Injection Pumps

Inlet-Metering Rotary Distributor Pumps

Sleeve-Metering Rotary Distributor Pumps

Dual-Actuator Eui Systems

Heui Fuel Systems

Electronic Unit Pump Eup Systems

Cummins Hpi-Tp

Common Rail Systems

Amplified Common Rail Systems

Review of Electrical and Electronics Fundamentals

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Ests and Siss

Electrical Wiring, Connector Terminal Repair

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