Solution and Answer Guide: Bennett, Heavy Duty Truck System 8e © 2025, 9780357934883;
Chapter 1: Introduction to Servicing Heavy-Duty Trucks
Solution and Answer Guide
BENNETT, HEAVY DUTY TRUCK SYSTEM 8E © 2025, 9780357934883;
CHAPTER 1: INTRODUCTION TO SERVICING HEAVY -DUTY TRUCKS
TABLE OF CONTENTS
Review Questions .............................................................................................................................1
Workbook Practice Questions ...................................................................................................... 11
REVIEW QUESTIONS
1. Which of the following is a correct definition of gross vehicle weight?
a. The mean weight of a vehicle.
b. The maximum allowable weight of a vehicle including its freight.
c. The maximum allowable weight of a vehicle minus its cargo.
d. The minimum allowable weight of a vehicle minus its cargo.
Answer: b. The maximum allowable weight of a vehicle including its freight.
a. Incorrect. Gross vehicle weight is the maximum allowable weight of the vehicle
including the weight of the load it can legally carry. Refer to: 1.2 TRUCK
CLASIFICATIONS, TABLE 1-1
b. Correct. Gross vehicle weight is the maximum allowable weight of the vehicle
including the weight of the load it can legally carry. Refer to: 1.2 TRUCK
CLASIFICATIONS, TABLE 1-1
c. Incorrect. Gross vehicle weight is the maximum allowable weight of the vehicle
including the weight of the load it can legally carry. Refer to: 1.2 TRUCK
CLASIFICATIONS, TABLE 1-1
d. Incorrect. Gross vehicle weight is the maximum allowable weight of the vehicle
including the weight of the load it can legally carry. Refer to: 1.2 TRUCK
CLASIFICATIONS, TABLE 1-1
2. How many major OEMs manufacture Class 8 trucks for the North American
market?
a. two
b. three
c. four
d. six
Answer: c. four
© 2025 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1
website, in whole or in part.
, Solution and Answer Guide: Bennett, Heavy Duty Truck System 8e © 2025, 9780357934883;
Chapter 1: Introduction to Servicing Heavy-Duty Trucks
a. Incorrect. In North America, there are four major truck manufacturers of class
7 and 8 heavy-duty trucks. Daimler AG, DAF-Paccar, International Trucks and
Volvo-Mack. Refer to: ORIGINAL EQUIPMENT MANUFACTURERS, TABLE 1-2
b. Incorrect. In North America, there are four major truck manufacturers of class
7 and 8 heavy-duty trucks. Daimler AG, DAF-Paccar, International Trucks and
Volvo-Mack. Refer to: ORIGINAL EQUIPMENT MANUFACTURERS, TABLE 1-2
c. Correct. In North America, there are four major truck manufacturers of class 7
and 8 heavy-duty trucks. Daimler AG, DAF-Paccar, International Trucks and
Volvo-Mack. Refer to: ORIGINAL EQUIPMENT MANUFACTURERS, TABLE 1-2
d. Incorrect. In North America, there are four major truck manufacturers of class
7 and 8 heavy-duty trucks. Daimler AG, DAF-Paccar, International Trucks and
Volvo-Mack. Refer to: ORIGINAL EQUIPMENT MANUFACTURERS, TABLE 1-2
3. Which classification group of highway trucks would be called “heavy-duty”?
a. Class 1 and 2
b. Class 3 and 4
c. Class 5 and 6
d. Class 7 and 8
Answer: d. Class 7 and 8
a. Incorrect. Class 1 and 2 trucks are designated as light-duty. Class 1 GVW is up
to 6,000 pounds (2722 kg). Class 2 GVW is 6,001-10,000 pounds (2722-4535 kg).
Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
b. Incorrect. Class 3 trucks are designated as light-duty with a GVW of 10,001-
14,000 pounds (4,535-6,350 kg). Class 4 trucks are designated as medium-duty
with a GVW of 14,001-16,000 pounds (6,350-7,257 kg). Refer to: 1.2 TRUCK
CLASSIFICATIONS, TABLE 1-1
c. Incorrect. Class 5 and 6 trucks are designated as medium-duty. Class 5 GVW is
16,001-19,500 pounds (7,257-8,845 kg). Class 6 GVW is 19,501-26,000 pounds
(8,845-11,793 kg).
d. Correct. Class 7 and 8 trucks are designated as heavy-duty with a gross vehicle
weight (GVW) of 26,001 pounds (11,794 kg) or more. Refer to: 1.2 TRUCK
CLASSIFICATIONS, TABLE 1-1
4. What is the GVW range of a Class 6 truck?
a. 16,001 to 19,500 pounds (7257–8845 kg)
b. 19,501 to 26,000 pounds (8846–11,793 kg)
c. 26,001 to 33,000 pounds (11,794–14,970 kg)
d. over 33,001 pounds (14,970 kg)
Answer: b. 19,501 to 26,000 pounds (8846–11,793 kg)
a. Incorrect. A Class 5 truck has a GVW range of 16,001 to 19,500 pounds (7257–
8845 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
© 2025 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 2
website, in whole or in part.
, Solution and Answer Guide: Bennett, Heavy Duty Truck System 8e © 2025, 9780357934883;
Chapter 1: Introduction to Servicing Heavy-Duty Trucks
b. Correct. A Class 6 truck has a GVW range of 19,501 to 26,000 pounds (8846–
11,793 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
c. Incorrect. A Class 7 truck has a GVW range of 26,001 to 33,000 pounds (11,794–
14,970 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
d. Incorrect. A Class 8 truck has a GVW range of over 33,001 pounds (14,970 kg).
Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
5. What is the GVW range of a Class 8 truck?
a. 16,001 to 19,500 pounds (7,257–8,845 kg)
b. 19,501 to 26,000 pounds (8,846–11,793 kg)
c. 26,001 to 33,000 pounds (11,794–14,970 kg)
d. over 33,001 pounds (14,970 kg)
Answer: d. over 33,001 pounds (14,970 kg)
a. Incorrect. A Class 5 truck has a GVW range of 16,001 to 19,500 pounds (7257–
8845 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
b. Incorrect. A Class 6 truck has a GVW range of 19,501 to 26,000 pounds (8846–
11,793 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
c. Incorrect. A Class 7 truck has a GVW range of 26,001 to 33,000 pounds (11,794–
14,970 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
d. Correct. A Class 8 truck has a GVW range of over 33,001 pounds (14,970 kg).
Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
6. What is used to power most heavy-duty trucks on our highways?
a. propane-fueled engines
b. gasoline-fueled engines
c. hydromechanical diesel engines
d. computer-controlled diesel engines
Answer: d. computer-controlled diesel engines
a. Incorrect. Current commercial heavy-duty trucks almost exclusively use
internal combustion engine (ICE) power with computer-controlled diesel
engines leading the way by a significant margin. Refer to: INTERNAL
COMBUSTION ENGINES (ICE), FIGURE 1-7.
b. Incorrect. Current commercial heavy-duty trucks almost exclusively use
internal combustion engine (ICE) power with computer-controlled diesel
engines leading the way by a significant margin. Refer to: INTERNAL
COMBUSTION ENGINES (ICE), FIGURE 1-7.
c. Incorrect. Current commercial heavy-duty trucks almost exclusively use
internal combustion engine (ICE) power with computer-controlled diesel
engines leading the way by a significant margin. Refer to: INTERNAL
COMBUSTION ENGINES (ICE), FIGURE 1-7.
d. Correct. Current commercial heavy-duty trucks almost exclusively use internal
combustion engine (ICE) power with computer-controlled diesel engines
© 2025 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 3
website, in whole or in part.
, Solution and Answer Guide: Bennett, Heavy Duty Truck System 8e © 2025, 9780357934883;
Chapter 1: Introduction to Servicing Heavy-Duty Trucks
leading the way by a significant margin. Refer to: INTERNAL COMBUSTION
ENGINES (ICE), FIGURE 1-7.
7. A truck equipped with six wheels, four of which are driven, would be classified as:
a. 4 × 6
b. 2 × 8
c. 10 × 4
d. 6 × 4
Answer: d. 6 x 4
a. Incorrect. 6x4 is right because the first number (6) refers to the total number
of wheels (or sets of wheels in the case of dual wheels). The second number
(4) indicates the number of wheels that are driven by the vehicle powertrain.
Refer to: AXLE CLASSSIFICATIONS, TABLE 1-3.
b. Incorrect. 6x4 is right because the first number (6) refers to the total number
of wheels (or sets of wheels in the case of dual wheels). The second number
(4) indicates the number of wheels that are driven by the vehicle powertrain.
Refer to: AXLE CLASSSIFICATIONS, TABLE 1-3.
c. Incorrect. 6x4 is right because the first number (6) refers to the total number
of wheels (or sets of wheels in the case of dual wheels). The second number
(4) indicates the number of wheels that are driven by the vehicle powertrain.
Refer to: AXLE CLASSSIFICATIONS, TABLE 1-3.
d. Correct. The first number (6) refers to the total number of wheels (or sets of
wheels in the case of dual wheels). The second number (4) indicates the
number of wheels that are driven by the vehicle powertrain, so 6 x 4 is correct.
Refer to: AXLE CLASSSIFICATIONS, TABLE 1-3.
8. What is used to provide steering power assist in most heavy-duty highway truck
systems?
a. compressed air
b. hydraulic pump
c. electric pump
d. drag link
Answer: b. hydraulic pump
a. Incorrect. In older trucks, steering assist could be provided by an air-powered
cylinder installed in the steering linkage, however this is not common. Refer to:
STEERING
b. Correct. Heavy-duty truck power steering systems use a hydraulic pump to
provide steering assist. Refer to: STEERING
c. Incorrect. Heavy-duty truck power steering systems use a hydraulic pump to
provide steering assist. Refer to: STEERING
d. Incorrect. Heavy-duty truck power steering systems use a hydraulic pump to
provide steering assist. Refer to: STEERING
© 2025 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 4
website, in whole or in part.
Chapter 1: Introduction to Servicing Heavy-Duty Trucks
Solution and Answer Guide
BENNETT, HEAVY DUTY TRUCK SYSTEM 8E © 2025, 9780357934883;
CHAPTER 1: INTRODUCTION TO SERVICING HEAVY -DUTY TRUCKS
TABLE OF CONTENTS
Review Questions .............................................................................................................................1
Workbook Practice Questions ...................................................................................................... 11
REVIEW QUESTIONS
1. Which of the following is a correct definition of gross vehicle weight?
a. The mean weight of a vehicle.
b. The maximum allowable weight of a vehicle including its freight.
c. The maximum allowable weight of a vehicle minus its cargo.
d. The minimum allowable weight of a vehicle minus its cargo.
Answer: b. The maximum allowable weight of a vehicle including its freight.
a. Incorrect. Gross vehicle weight is the maximum allowable weight of the vehicle
including the weight of the load it can legally carry. Refer to: 1.2 TRUCK
CLASIFICATIONS, TABLE 1-1
b. Correct. Gross vehicle weight is the maximum allowable weight of the vehicle
including the weight of the load it can legally carry. Refer to: 1.2 TRUCK
CLASIFICATIONS, TABLE 1-1
c. Incorrect. Gross vehicle weight is the maximum allowable weight of the vehicle
including the weight of the load it can legally carry. Refer to: 1.2 TRUCK
CLASIFICATIONS, TABLE 1-1
d. Incorrect. Gross vehicle weight is the maximum allowable weight of the vehicle
including the weight of the load it can legally carry. Refer to: 1.2 TRUCK
CLASIFICATIONS, TABLE 1-1
2. How many major OEMs manufacture Class 8 trucks for the North American
market?
a. two
b. three
c. four
d. six
Answer: c. four
© 2025 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1
website, in whole or in part.
, Solution and Answer Guide: Bennett, Heavy Duty Truck System 8e © 2025, 9780357934883;
Chapter 1: Introduction to Servicing Heavy-Duty Trucks
a. Incorrect. In North America, there are four major truck manufacturers of class
7 and 8 heavy-duty trucks. Daimler AG, DAF-Paccar, International Trucks and
Volvo-Mack. Refer to: ORIGINAL EQUIPMENT MANUFACTURERS, TABLE 1-2
b. Incorrect. In North America, there are four major truck manufacturers of class
7 and 8 heavy-duty trucks. Daimler AG, DAF-Paccar, International Trucks and
Volvo-Mack. Refer to: ORIGINAL EQUIPMENT MANUFACTURERS, TABLE 1-2
c. Correct. In North America, there are four major truck manufacturers of class 7
and 8 heavy-duty trucks. Daimler AG, DAF-Paccar, International Trucks and
Volvo-Mack. Refer to: ORIGINAL EQUIPMENT MANUFACTURERS, TABLE 1-2
d. Incorrect. In North America, there are four major truck manufacturers of class
7 and 8 heavy-duty trucks. Daimler AG, DAF-Paccar, International Trucks and
Volvo-Mack. Refer to: ORIGINAL EQUIPMENT MANUFACTURERS, TABLE 1-2
3. Which classification group of highway trucks would be called “heavy-duty”?
a. Class 1 and 2
b. Class 3 and 4
c. Class 5 and 6
d. Class 7 and 8
Answer: d. Class 7 and 8
a. Incorrect. Class 1 and 2 trucks are designated as light-duty. Class 1 GVW is up
to 6,000 pounds (2722 kg). Class 2 GVW is 6,001-10,000 pounds (2722-4535 kg).
Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
b. Incorrect. Class 3 trucks are designated as light-duty with a GVW of 10,001-
14,000 pounds (4,535-6,350 kg). Class 4 trucks are designated as medium-duty
with a GVW of 14,001-16,000 pounds (6,350-7,257 kg). Refer to: 1.2 TRUCK
CLASSIFICATIONS, TABLE 1-1
c. Incorrect. Class 5 and 6 trucks are designated as medium-duty. Class 5 GVW is
16,001-19,500 pounds (7,257-8,845 kg). Class 6 GVW is 19,501-26,000 pounds
(8,845-11,793 kg).
d. Correct. Class 7 and 8 trucks are designated as heavy-duty with a gross vehicle
weight (GVW) of 26,001 pounds (11,794 kg) or more. Refer to: 1.2 TRUCK
CLASSIFICATIONS, TABLE 1-1
4. What is the GVW range of a Class 6 truck?
a. 16,001 to 19,500 pounds (7257–8845 kg)
b. 19,501 to 26,000 pounds (8846–11,793 kg)
c. 26,001 to 33,000 pounds (11,794–14,970 kg)
d. over 33,001 pounds (14,970 kg)
Answer: b. 19,501 to 26,000 pounds (8846–11,793 kg)
a. Incorrect. A Class 5 truck has a GVW range of 16,001 to 19,500 pounds (7257–
8845 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
© 2025 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 2
website, in whole or in part.
, Solution and Answer Guide: Bennett, Heavy Duty Truck System 8e © 2025, 9780357934883;
Chapter 1: Introduction to Servicing Heavy-Duty Trucks
b. Correct. A Class 6 truck has a GVW range of 19,501 to 26,000 pounds (8846–
11,793 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
c. Incorrect. A Class 7 truck has a GVW range of 26,001 to 33,000 pounds (11,794–
14,970 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
d. Incorrect. A Class 8 truck has a GVW range of over 33,001 pounds (14,970 kg).
Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
5. What is the GVW range of a Class 8 truck?
a. 16,001 to 19,500 pounds (7,257–8,845 kg)
b. 19,501 to 26,000 pounds (8,846–11,793 kg)
c. 26,001 to 33,000 pounds (11,794–14,970 kg)
d. over 33,001 pounds (14,970 kg)
Answer: d. over 33,001 pounds (14,970 kg)
a. Incorrect. A Class 5 truck has a GVW range of 16,001 to 19,500 pounds (7257–
8845 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
b. Incorrect. A Class 6 truck has a GVW range of 19,501 to 26,000 pounds (8846–
11,793 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
c. Incorrect. A Class 7 truck has a GVW range of 26,001 to 33,000 pounds (11,794–
14,970 kg). Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
d. Correct. A Class 8 truck has a GVW range of over 33,001 pounds (14,970 kg).
Refer to: 1.2 TRUCK CLASSIFICATIONS, TABLE 1-1
6. What is used to power most heavy-duty trucks on our highways?
a. propane-fueled engines
b. gasoline-fueled engines
c. hydromechanical diesel engines
d. computer-controlled diesel engines
Answer: d. computer-controlled diesel engines
a. Incorrect. Current commercial heavy-duty trucks almost exclusively use
internal combustion engine (ICE) power with computer-controlled diesel
engines leading the way by a significant margin. Refer to: INTERNAL
COMBUSTION ENGINES (ICE), FIGURE 1-7.
b. Incorrect. Current commercial heavy-duty trucks almost exclusively use
internal combustion engine (ICE) power with computer-controlled diesel
engines leading the way by a significant margin. Refer to: INTERNAL
COMBUSTION ENGINES (ICE), FIGURE 1-7.
c. Incorrect. Current commercial heavy-duty trucks almost exclusively use
internal combustion engine (ICE) power with computer-controlled diesel
engines leading the way by a significant margin. Refer to: INTERNAL
COMBUSTION ENGINES (ICE), FIGURE 1-7.
d. Correct. Current commercial heavy-duty trucks almost exclusively use internal
combustion engine (ICE) power with computer-controlled diesel engines
© 2025 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 3
website, in whole or in part.
, Solution and Answer Guide: Bennett, Heavy Duty Truck System 8e © 2025, 9780357934883;
Chapter 1: Introduction to Servicing Heavy-Duty Trucks
leading the way by a significant margin. Refer to: INTERNAL COMBUSTION
ENGINES (ICE), FIGURE 1-7.
7. A truck equipped with six wheels, four of which are driven, would be classified as:
a. 4 × 6
b. 2 × 8
c. 10 × 4
d. 6 × 4
Answer: d. 6 x 4
a. Incorrect. 6x4 is right because the first number (6) refers to the total number
of wheels (or sets of wheels in the case of dual wheels). The second number
(4) indicates the number of wheels that are driven by the vehicle powertrain.
Refer to: AXLE CLASSSIFICATIONS, TABLE 1-3.
b. Incorrect. 6x4 is right because the first number (6) refers to the total number
of wheels (or sets of wheels in the case of dual wheels). The second number
(4) indicates the number of wheels that are driven by the vehicle powertrain.
Refer to: AXLE CLASSSIFICATIONS, TABLE 1-3.
c. Incorrect. 6x4 is right because the first number (6) refers to the total number
of wheels (or sets of wheels in the case of dual wheels). The second number
(4) indicates the number of wheels that are driven by the vehicle powertrain.
Refer to: AXLE CLASSSIFICATIONS, TABLE 1-3.
d. Correct. The first number (6) refers to the total number of wheels (or sets of
wheels in the case of dual wheels). The second number (4) indicates the
number of wheels that are driven by the vehicle powertrain, so 6 x 4 is correct.
Refer to: AXLE CLASSSIFICATIONS, TABLE 1-3.
8. What is used to provide steering power assist in most heavy-duty highway truck
systems?
a. compressed air
b. hydraulic pump
c. electric pump
d. drag link
Answer: b. hydraulic pump
a. Incorrect. In older trucks, steering assist could be provided by an air-powered
cylinder installed in the steering linkage, however this is not common. Refer to:
STEERING
b. Correct. Heavy-duty truck power steering systems use a hydraulic pump to
provide steering assist. Refer to: STEERING
c. Incorrect. Heavy-duty truck power steering systems use a hydraulic pump to
provide steering assist. Refer to: STEERING
d. Incorrect. Heavy-duty truck power steering systems use a hydraulic pump to
provide steering assist. Refer to: STEERING
© 2025 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 4
website, in whole or in part.
