Question 1

Which of the following could result in abnormally high manifold boost on an engine with a VGT turbocharger?

Accepted Answer

A)  sticking VGT vane ring 
B)  retarded injection timing 
C)  plugged charge air cooler 
D)  restricted DPF 
A)  sticking VGT vane ring 
B)  retarded injection timing 
C)  plugged charge air cooler 
D)  restricted DPF

Question 2

Technician A says that an engine malfunction on a Mack electronic engine manufactured between 2002 and 2010 can have up to 10 possible causes. Technician B says that an electronic engine malfunction on a post-2010 Mack engine can have up to 25 possible causes. 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 3

Which of the following conditions would be the more likely source of a coolant in oil condition?

Accepted Answer

A)  Prolonged high load operation 
B)  Prolonged low load operation 
C)  Failure of coolant filter pad lock-off ball 
D)  Leaking fuel injector cup seal 
A)  Prolonged high load operation 
B)  Prolonged low load operation 
C)  Failure of coolant filter pad lock-off ball 
D)  Leaking fuel injector cup seal

Question 4

Which of the following instruments is designed for testing the exhaust gas temperature in a diesel engine?

Accepted Answer

A)  digital multimeter (DMM) 
B)  scan tool 
C)  pyrometer 
D)  thermistor 
A)  digital multimeter (DMM) 
B)  scan tool 
C)  pyrometer 
D)  thermistor

Question 5

Which of the following conditions could result in high engine exhaust temperature?

Accepted Answer

A)  Advanced injection timing 
B)  Leak in the air intake circuit 
C)  Restricted air intake system 
D)  All of the above 
A)  Advanced injection timing 
B)  Leak in the air intake circuit 
C)  Restricted air intake system 
D)  All of the above

Question 6

Which of the following is the more likely cause of an engine hunting condition?

Accepted Answer

A)  unbalanced fuel delivery by injectors 
B)  damaged aneroid device 
C)  low CN value of fuel 
D)  plugged air filter 
A)  unbalanced fuel delivery by injectors 
B)  damaged aneroid device 
C)  low CN value of fuel 
D)  plugged air filter

Question 7

Technician A says that frequent DPF regeneration cycles can be an indication of a serious internal engine problem. Technician B says in the event of a DPF malfunction, a DTC will be logged before any damage can occur to the DPF. 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 8

Which of the following can restrict a secondary fuel filter sufficiently to shut down diesel engine?

Accepted Answer

A)  diesel fuel conditioner 
B)  Water 
C)  alcohol 
D)  kerosene 
A)  diesel fuel conditioner 
B)  Water 
C)  alcohol 
D)  kerosene

Exam 52: Troubleshooting and Diagnostics

Which of the following could result in abnormally high manifold boost on an engine with a VGT turbocharger?

Technician A says that an engine malfunction on a Mack electronic engine manufactured between 2002 and 2010 can have up to 10 possible causes. Technician B says that an electronic engine malfunction on a post-2010 Mack engine can have up to 25 possible causes. Who is correct?

Which of the following conditions would be the more likely source of a coolant in oil condition?

Which of the following instruments is designed for testing the exhaust gas temperature in a diesel engine?

Which of the following conditions could result in high engine exhaust temperature?

Which of the following is the more likely cause of an engine hunting condition?

Technician A says that frequent DPF regeneration cycles can be an indication of a serious internal engine problem. Technician B says in the event of a DPF malfunction, a DTC will be logged before any damage can occur to the DPF. Who is correct?

Which of the following can restrict a secondary fuel filter sufficiently to shut down diesel engine?

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

Single-Actuator Eui Systems

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

Vehicle Computer Systems

Ests and Siss

Electrical Wiring, Connector Terminal Repair

Multiplexing

The Connected Vehicle

Natural Gas, Propane, and Biodiesel Fuels

High Voltage Electricity

Hybrid and Hydrogen Fuel Cell Drivetrains

Electric Powertrains

Bosch Edc Systems

Caterpillar Engine Management Systems

Cummins Management Systems

Detroit Diesel Electronic Controls Ddec

Navistar Diamond Logic

Paccar Engine Management Systems

Volvo and Mack Engine Management

Emissions Management

Servicing Maintenance of Exhaust Aftertreatment Systems

Failure Analysis

Filters