Question 1

Which type of doors would you find on a trailer used primarily for pick-up and delivery work?

Accepted Answer

A)  roll-up rear door 
B)  single-swinging rear door 
C)  double-swinging rear door 
D)  tail gate 
A)  roll-up rear door 
B)  single-swinging rear door 
C)  double-swinging rear door 
D)  tail gate A

Question 2

When setting a rivet using a pneumatic rivet gun,what tool should be used on the shank side of the rivet gun to form the bucked head?

Accepted Answer

A)  ball peen hammer 
B)  rivet set 
C)  cold chisel 
D)  bucking bar 
A)  ball peen hammer 
B)  rivet set 
C)  cold chisel 
D)  bucking bar D

Question 3

Which of the following interior compartment temperatures are commonly used for refrigerated freight?

Accepted Answer

A)  35 degrees F (2 degrees 
C)  
B)  0 degrees F (-18 degrees 
C)  
C)  -20 degrees F (-29 degrees 
C)  
D)  all of the above 
A)  35 degrees F (2 degrees 
C)  
B)  0 degrees F (-18 degrees 
C)  
C)  -20 degrees F (-29 degrees 
C)  
D)  all of the above D

Question 4

What legislation governs trailer lighting standards in the United States?

Accepted Answer

A)  FMVSS-101 
B)  FMVSS-108 
C)  FMVSS-121 
D)  FMVSS-180 
A)  FMVSS-101 
B)  FMVSS-108 
C)  FMVSS-121 
D)  FMVSS-180

Question 5

A crack is visible in a lens used in a sealed trailer tail light assembly but the light operation is not affected.Technician A says that the crack should be sealed with some silicone RTV to ensure no moisture enters.Technician B says that the cracked lens should be replaced.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 6

Technician A says cryogenic reefers units have a heavy carbon footprint and ODP rating.Technician B says that R-22 has been approved for use in refrigerated trailers until the year 2020.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 7

When a sliding trailer bogie is used,how many mechanical locking pins are used on a typical unit?

Accepted Answer

A)  one 
B)  two 
C)  four 
D)  eight 
A)  one 
B)  two 
C)  four 
D)  eight

Question 8

What is the FMVSS-121 minimum required stopping distance for a tractor-trailer semi rig built after 2010?

Accepted Answer

A)  125 feet 
B)  250 feet 
C)  350 feet 
D)  500 feet 
A)  125 feet 
B)  250 feet 
C)  350 feet 
D)  500 feet

Question 9

What is the industry standard fifth-wheel height?

Accepted Answer

A)  52 inches 
B)  48 inches 
C)  44 inches 
D)  42 inches 
A)  52 inches 
B)  48 inches 
C)  44 inches 
D)  42 inches

Question 10

Which of the following must be true of milk tanker trailer?

Accepted Answer

A)  no internal bulkheads 
B)  must be equipped with tank pop-off valve 
C)  must be equipped with tank rupture disk 
D)  no upper hatch flange 
A)  no internal bulkheads 
B)  must be equipped with tank pop-off valve 
C)  must be equipped with tank rupture disk 
D)  no upper hatch flange

Question 11

Which of the following is the most common crossmember spread used in the sub-frame of a van semi-trailer?

Accepted Answer

A)  6-inches (150 mm) 
B)  9-inches (230 mm) 
C)  12-inches (300 mm) 
D)  18-inches (460 mm) 
A)  6-inches (150 mm) 
B)  9-inches (230 mm) 
C)  12-inches (300 mm) 
D)  18-inches (460 mm)

Question 12

What on-trailer device is used to track trailer mileage for purposes of maintenance scheduling?

Accepted Answer

A)  odometer 
B)  tractor data bus 
C)  hubdometer 
D)  trailer data bus 
A)  odometer 
B)  tractor data bus 
C)  hubdometer 
D)  trailer data bus

Question 13

How should trailer hand-crank landing gear legs and crankcase be lubricated?

Accepted Answer

A)  multi-purpose gear lube 
B)  SAE 30W engine oil 
C)  grease applied through zerks 
D)  penetrating oil 
A)  multi-purpose gear lube 
B)  SAE 30W engine oil 
C)  grease applied through zerks 
D)  penetrating oil

Question 14

What type of highway train combination is made up of a tractor,two semi-trailers,and one converter dolly,drawbar and pintle hook assembly?

Accepted Answer

A)  A-Train 
B)  B-Train 
C)  C-Train 
D)  D-Train 
A)  A-Train 
B)  B-Train 
C)  C-Train 
D)  D-Train

Question 15

Which of the following refrigerants has the lowest ozone depletion potential (ODP)rating?

Accepted Answer

A)  R-134a 
B)  R-22 
C)  R-12 
D)  R-422D 
A)  R-134a 
B)  R-22 
C)  R-12 
D)  R-422D

Question 16

When system air pressure is routed into the trailer hold-off circuit,the parking brakes are:

Accepted Answer

A)  50% applied 
B)  100% applied 
C)  50% released 
D)  fully released 
A)  50% applied 
B)  100% applied 
C)  50% released 
D)  fully released

Question 17

How are some trailer-specific tires different from truck tires?

Accepted Answer

A)  trailer tires are lighter in weight 
B)  trailer tires usually have shallower treads 
C)  trailer tires usually last longer 
D)  all of the above 
A)  trailer tires are lighter in weight 
B)  trailer tires usually have shallower treads 
C)  trailer tires usually last longer 
D)  all of the above

Question 18

Which of the following would be more likely to result in flat spots on trailer tires?

Accepted Answer

A)  unbalanced braking 
B)  wheel hop 
C)  uneven trailer loading 
D)  suspension lean 
A)  unbalanced braking 
B)  wheel hop 
C)  uneven trailer loading 
D)  suspension lean

Question 19

Technician A says that most van semi-trailers use unibody construction.Technician B says that most van semi-trailers use monocoque construction.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 20

Technician A says that the bucked side of a rivet is usually countersunk.Technician B says that any bucked head should be formed with an even radius.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

Exam 33: Heavy-Duty Truck Trailers

Which type of doors would you find on a trailer used primarily for pick-up and delivery work?

When setting a rivet using a pneumatic rivet gun,what tool should be used on the shank side of the rivet gun to form the bucked head?

Which of the following interior compartment temperatures are commonly used for refrigerated freight?

What legislation governs trailer lighting standards in the United States?

A crack is visible in a lens used in a sealed trailer tail light assembly but the light operation is not affected.Technician A says that the crack should be sealed with some silicone RTV to ensure no moisture enters.Technician B says that the cracked lens should be replaced.Who is correct?

Technician A says cryogenic reefers units have a heavy carbon footprint and ODP rating.Technician B says that R-22 has been approved for use in refrigerated trailers until the year 2020.Who is correct?

When a sliding trailer bogie is used,how many mechanical locking pins are used on a typical unit?

What is the FMVSS-121 minimum required stopping distance for a tractor-trailer semi rig built after 2010?

What is the industry standard fifth-wheel height?

Which of the following must be true of milk tanker trailer?

Which of the following is the most common crossmember spread used in the sub-frame of a van semi-trailer?

What on-trailer device is used to track trailer mileage for purposes of maintenance scheduling?

How should trailer hand-crank landing gear legs and crankcase be lubricated?

What type of highway train combination is made up of a tractor,two semi-trailers,and one converter dolly,drawbar and pintle hook assembly?

Which of the following refrigerants has the lowest ozone depletion potential (ODP)rating?

When system air pressure is routed into the trailer hold-off circuit,the parking brakes are:

How are some trailer-specific tires different from truck tires?

Which of the following would be more likely to result in flat spots on trailer tires?

Technician A says that most van semi-trailers use unibody construction.Technician B says that most van semi-trailers use monocoque construction.Who is correct?

Technician A says that the bucked side of a rivet is usually countersunk.Technician B says that any bucked head should be formed with an even radius.Who is correct?

Introduction to Servicing Heavy-Duty Trucks

Shop Safety and Operations

Tools and Fasteners

Preventive Maintenance Program

Fundamentals of Electricity

Fundamentals of Electronics and Computers

Batteries

Charging Systems

Cranking Systems

Chassis Electrical Circuits

Diagnosis and Repair of Electronic Circuits

Multiplexing

Hydraulics

Clutches

Standard Transmissions

Standard Transmission Servicing

Torque Converters

Automatic Transmissions

Automatic Transmission Maintenance

Electronically Automated Standard Transmissions

Electronically Controlled Automatic Transmissions Ecats

Driveshaft Assemblies

Heavy-Duty Truck Axles

Heavy-Duty Truck Axle Service and Repair

Steering and Alignment

Suspension Systems

Wheels and Tires

Truck Brake Systems

Hydraulic Brakes and Air-Over-Hydraulic Brake Systems

Abs and Ebs

Air Brake Servicing

Vehicle Chassis Frame

Fifth Wheels and Coupling Systems

Heavy-Duty Heating, ventilation, and Air Conditioning Systems

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