Question 1

What happens to resistance in an NTC thermistor when temperature increases?

Accepted Answer

A)  nothing 
B)  decreases 
C)  increases 
D)  reverse biases 
A)  nothing 
B)  decreases 
C)  increases 
D)  reverse biases B

Question 2

What type of device is used as a coolant temperature sensor on a typical truck engine management system?

Accepted Answer

A)  NTC thermistor 
B)  PTC thermistor 
C)  pyrometer 
D)  infrared thermometer 
A)  NTC thermistor 
B)  PTC thermistor 
C)  pyrometer 
D)  infrared thermometer A

Question 3

Which acronym is used to describe the type of memory that would be retained when the ignition is key-off, but lost if the battery were disconnected?

Accepted Answer

A)  RAM 
B)  NV-RAM 
C)  ROM 
D)  EEPROM 
A)  RAM 
B)  NV-RAM 
C)  ROM 
D)  EEPROM B

Question 4

What is the usual V-Ref value in diesel engine management systems?

Accepted Answer

A)  less than 1 V-DC 
B)  5 V-DC 
C)  8 V-DC 
D)  12.6 V-DC 
A)  less than 1 V-DC 
B)  5 V-DC 
C)  8 V-DC 
D)  12.6 V-DC

Question 5

?What is a polyswitch?

Accepted Answer

A)  ?A new kind of stalk switch 
B)  ?A PTC circuit protection device 
C)  ?A multi-position toggle switch 
D)  ?A programmable function, generic smart switch 
A)  ?A new kind of stalk switch 
B)  ?A PTC circuit protection device 
C)  ?A multi-position toggle switch 
D)  ?A programmable function, generic smart switch

Question 6

Which type of memory is retained electronically in a vehicle ECM?

Accepted Answer

A)  ROM 
B)  PROM 
C)  RAM 
D)  EEPROM 
A)  ROM 
B)  PROM 
C)  RAM 
D)  EEPROM

Question 7

Which of the following is NOT one of the three stages of a vehicle computer, processing cycle?

Accepted Answer

A)  data input 
B)  data processing 
C)  outputs 
D)  multiplexing 
A)  data input 
B)  data processing 
C)  outputs 
D)  multiplexing

Question 8

Which of the following would accurately describe engine fuel map programming in a typical truck engine ECM?

Accepted Answer

A)  fully hard-valued: can never be altered 
B)  soft valued: constantly altered by processing cycle 
C)  can be altered only by customer data programming 
D)  can be altered only by proprietary data programming 
A)  fully hard-valued: can never be altered 
B)  soft valued: constantly altered by processing cycle 
C)  can be altered only by customer data programming 
D)  can be altered only by proprietary data programming

Question 9

Which of the following acronyms is another way of saying main memory?

Accepted Answer

A)  ROM 
B)  CPU 
C)  RAM 
D)  ECU 
A)  ROM 
B)  CPU 
C)  RAM 
D)  ECU

Question 10

Technician A says that flash memory stores data in blocks of bytes rather than byte by byte. Technician B says that flash memory is slower to log data than EEPROM. 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 11

Which of the following customer data programming options could be described as toggle options?

Accepted Answer

A)  road speed governing 
B)  maximum engine speed 
C)  LS or VS governing 
D)  hard cruise limits 
A)  road speed governing 
B)  maximum engine speed 
C)  LS or VS governing 
D)  hard cruise limits

Question 12

If you had to classify a Freightliner SAM into one of the following categories, which would you select? ?

Accepted Answer

A)  ?MCM 
B)  ?CPC 
C)  ?PLD 
D)  ?ECU 
A)  ?MCM 
B)  ?CPC 
C)  ?PLD 
D)  ?ECU

Question 13

Technician A says that multiple sensors such as those for temperature and pressures may be incorporated into what appears to be a single device. Technician B says that chassis body controllers such as SAMs must be capable of communicating with the powertrain bus in current truck chassis. 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 14

Which of the following is a disadvantage of a solenoid actuator when compared with a piezo actuator?

Accepted Answer

A)  mechanical movement is severely limited 
B)  are more bulky in size 
C)  slow response 
D)  high cost 
A)  mechanical movement is severely limited 
B)  are more bulky in size 
C)  slow response 
D)  high cost

Question 15

Which of the following devices does NOT require a V-Ref input?

Accepted Answer

A)  thermistor 
B)  variable capacitance type sensor 
C)  potentiometer 
D)  induction pulse generator 
A)  thermistor 
B)  variable capacitance type sensor 
C)  potentiometer 
D)  induction pulse generator

Question 16

When files are transferred from a mainframe computer to a PC, they are:

Accepted Answer

A)  recorded 
B)  downloaded 
C)  uploaded 
D)  burned 
A)  recorded 
B)  downloaded 
C)  uploaded 
D)  burned

Question 17

Which of the following fits the description of multiplexing?

Accepted Answer

A)  multiple vehicle computers networked by a data bus 
B)  GPS communications 
C)  vehicle ECM to PC communications 
D)  laptop to vehicle data bus handshake networking 
A)  multiple vehicle computers networked by a data bus 
B)  GPS communications 
C)  vehicle ECM to PC communications 
D)  laptop to vehicle data bus handshake networking

Question 18

When an NTC thermistor is used as an oil temperature sensor, what happens to the signal voltage when oil temperature increases?

Accepted Answer

A)  nothing 
B)  decreases 
C)  increases 
D)  reverse biases 
A)  nothing 
B)  decreases 
C)  increases 
D)  reverse biases

Question 19

When processing the signal from an inductive pulse generator used to measure shaft rotational speed, which of the following is used to process the signal to an rpm value?

Accepted Answer

A)  DC voltage 
B)  AC voltage 
C)  Amperage 
D)  Frequency 
A)  DC voltage 
B)  AC voltage 
C)  Amperage 
D)  Frequency

Question 20

When two chassis electronic systems are required to exchange information and their operating protocols do not match, what is required to make communication possible?

Accepted Answer

A)  transducers 
B)  translator box 
C)  interface or gateway module 
D)  power supply module 
A)  transducers 
B)  translator box 
C)  interface or gateway module 
D)  power supply module

Exam 33: Vehicle Computer Systems

What happens to resistance in an NTC thermistor when temperature increases?

What type of device is used as a coolant temperature sensor on a typical truck engine management system?

Which acronym is used to describe the type of memory that would be retained when the ignition is key-off, but lost if the battery were disconnected?

What is the usual V-Ref value in diesel engine management systems?

?What is a polyswitch?

Which type of memory is retained electronically in a vehicle ECM?

Which of the following is NOT one of the three stages of a vehicle computer, processing cycle?

Which of the following would accurately describe engine fuel map programming in a typical truck engine ECM?

Which of the following acronyms is another way of saying main memory?

Technician A says that flash memory stores data in blocks of bytes rather than byte by byte. Technician B says that flash memory is slower to log data than EEPROM. Who is correct?

Which of the following customer data programming options could be described as toggle options?

If you had to classify a Freightliner SAM into one of the following categories, which would you select? ?

Which of the following is a disadvantage of a solenoid actuator when compared with a piezo actuator?

Which of the following devices does NOT require a V-Ref input?

When files are transferred from a mainframe computer to a PC, they are:

Which of the following fits the description of multiplexing?

When an NTC thermistor is used as an oil temperature sensor, what happens to the signal voltage when oil temperature increases?

When processing the signal from an inductive pulse generator used to measure shaft rotational speed, which of the following is used to process the signal to an rpm value?

When two chassis electronic systems are required to exchange information and their operating protocols do not match, what is required to make communication possible?

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

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

Troubleshooting and Diagnostics

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