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1. Which of the following describes a semi-trailer?
a.
any trailer that is less than 53 feet long
b.
trailer that whose weight must be partially supported by another vehicle
c.
any trailer used in a linehaul application
d.
trailer hauled by a class 7 or class 8 tractor
b
2. A semi-trailer with three axles, a fifth wheel, and known as a lead trailer would be part of which of the following
vehicle combinations?
a.
A-Train
b.
B-Train
c.
C-Train
d.
D-Train
b
3. Which of the following highway train combinations does not use a converter dolly?
a.
A-train
b.
B-Train
c.
C-Train
d.
D-Train
b
4. What type of highway train combination is made up of a tractor, two semi-trailers, and one converter dolly, drawbar
and pintle hook assembly?
a.
A-Train
b.
B-Train
c.
C-Train
d.
D-Train
5. What is the essential difference between an A-Train and a C-Train?
a.
C-Train is longer
b.
A-Train is longer
c.
C-Train has a rigid double-drawbar system
d.
A-Train has more pivot points
6. What is the industry standard fifth-wheel height?
a.
52 inches
b.
48 inches
c.
44 inches
d.
42 inches
b
7. What is considered to be the standard loading dock height?
a.
48 inches
b.
54 inches
c.
56 inches
d.
60 inches
b
8. Which part of the trailer flooring suffers the most abuse and usually needs the most reinforcement and repair?
a.
rear four feet
b.
front four feet
c.
area directly over the suspension
d.
area directly over the landing gear
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9. Which of the following problems weakens the frame of a trailer constructed in the monocoque style?
a.
floor rotted out
b.
damaged door post
c.
sagging roof
d.
all of the above
d
10. Which type of doors would you find on a trailer used primarily for pick-up and delivery work?
a.
roll-up rear door
b.
single-swinging rear door
c.
double-swinging rear door
d.
tail gate
11. Which type of trailer floor design would be most suitable for use in a refrigerated trailer?
a.
duct-type floor
b.
T-bar-type floor
c.
hybrid T-bar duct
d.
ship lapped, laminated oak
12. Which of the following interior compartment temperatures are commonly used for refrigerated freight?
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
13. How are some trailer-specific tires different from truck tires?
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
d
14. How many articulation points are there in a complete A-train combination?
a.
one
b.
two
c.
three
d.
four
15. If 60 feet (18 meters) of wiring is required to safely connect a circuit that has an 8-amp operating load, what U.S.
standard wiring gauge is required?
a.
18 AWG
b.
16 AWG
c.
12 AWG
d.
10 AWG
16. Which of the following have lowered the electrical current load and reduced maintenance downtime on trailer wiring
systems?
a.
LED lighting
b.
modular wiring
c.
plug-in connectors
d.
all of the above
d
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17. Which of the following differentiates a D-train combination from other multi-trailer highway trains?
a.
articulation between the lead and pup is removed
b.
articulation between the tractor and lead trailer is removed
c.
three points of articulation
d.
two points of articulation
18. Which of the following is NOT an advantage of fiber reinforced plywood (FRP) panels over aluminum in trailer
construction?
a.
lighter weight
b.
easier to replace
c.
better corrosion resistance
d.
lasts much longer
19. What is the maximum height permitted on any highway truck or trailer operated in the USA, Mexico, or Canada?
a.
10 feet 8 inches (3.25 meters)
b.
12 feet 6 inches (3.81 meters)
c.
13 feet 6 inches (4.11 meters)
d.
14 feet 8 inches (4.47 meters)
20. What is the longest permissible length of a semi-trailer allowed on most US, Mexican, and Canadian highways (in
some jurisdictions this may be lower, some higher)?
a.
44 feet (13.4 meters)
b.
48 feet (14.6 meters)
c.
53 feet (16.2 meters)
d.
57 feet (17.4 meters)
21. Which of the following best describes the function of a converter dolly?
a.
converts a full trailer to a semi-trailer
b.
converts a semi-trailer to a full trailer
c.
allows trailer payload to be increased
d.
usually couples a trailer directly to a tractor
22. What does the eye on a drawbar connect to?
a.
upper coupler
b.
lower coupler
c.
fifth wheel
d.
pintle hook
23. To which of the following assemblies is a kingpin either welded or bolted?
a.
upper coupler
b.
lower coupler
c.
fifth wheel
d.
drawbar eye
24. What is the usual maximum width of a trailer permitted on a North American highway?
a.
96-inches (2.44 meters)
b.
102-inches (2.59 meters)
c.
108-inches (2.74 meters)
d.
112-inches (2.84 meters)
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25. Which of the following terms has the same meaning as landing gear on a trailer?
a.
duals
b.
tandem axle
c.
dolly legs
d.
lift axle
26. What supports the front end of a semi-trailer when it is uncoupled from a tractor and parked?
a.
upper coupler
b.
dolly legs
c.
lift axle
d.
nose plate
b
27. 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?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
28. Which of the following is an advantage of a tongue and groove, laminated oak floor in a unibody semi-trailer?
a.
tough and weather resistant
b.
adds to structural integrity of frame
c.
withstands forklift truck and skid abuse
d.
all of the above
d
29. What is the common screw size used to secure laminated oak floor boards to a van trailer sub-frame?
a.
1/4-inch (6 mm)
b.
5/16-inch (8 mm)
c.
3/8-inch (10 mm)
d.
7/16-inch (11 mm)
b
30. Which of the following is the most common crossmember spread used in the sub-frame of a van semi-trailer?
a.
6-inches (150 mm)
b.
9-inches (230 mm)
c.
12-inches (300 mm)
d.
18-inches (460 mm)
31. What is a commonly used term meaning a hinged trailer door?
a.
roll-up
b.
swinger
c.
tail gate
d.
all of the above
b
32. Which of the following van type trailers offers the convenience of loading from the side?
a.
open-top van
b.
curtain-sided
c.
roll-up
d.
swinger
b
33. What does the term reefer refer to in the trucking industry?
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a.
refrigerated van trailer
b.
truck air-conditioning system
c.
torque multiplier
d.
wedge-shaped bar
34. Technician A says that most of the engines used in current refrigerated trailers are gasoline fueled. Technician B says
that both the engine and temperature control systems used in current refrigerated trailers are electronically managed. Who
is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
b
35. When a refrigerated trailer is divided into three compartments, each managed at a different temperature, which of the
following is required?
a.
separate reefer unit for each compartment
b.
separate condenser for each compartment
c.
separate evaporator for each compartment
d.
separate computer for each compartment
36. What is the cooling capacity of reefer units measured in?
a.
BHP (watts)
b.
lb.-ft. (N.m)
c.
atms (bar)
d.
Btus (joules)
d
37. Which of the following values would represent typical maximum cooling capacity of a refrigerated van?
a.
12,000 Btu (12,660 kj)
b.
14,000 Btu (14,770 kj)
c.
18,000 Btu (18,991 kj)
d.
25,000 Btu (26,376 kj)
d
38. Who sets the performance standards required for reefer vans used on NAFTA (U.S.A., Canada and Mexico)
highways?
a.
American Trucking Association
b.
Technology and Maintenance Council
c.
American Refrigeration Institute
d.
Society of Automotive Engineers
39. 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?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
b
40. Which of the following refrigerants has the lowest ozone depletion potential (ODP) rating?
a.
R-134a
b.
R-22
c.
R-12
d.
R-422D
d
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41. Which of the following media is used in a cryogenic refrigerated unit?
a.
R-422D
b.
R-22
c.
liquid nitrogen
d.
liquid oxygen
42. Which of the following trailers should be used to haul dry cement?
a.
open top belly dump
b.
mixer barrel trailer
c.
slant front bathtub dump
d.
dry bulk pressure hopper
d
43. What would be the maximum cubic capacity of a typical full size semi-trailer dump box?
a.
10 yards (7.65 cubic meters)
b.
15 yards (11.5 cubic meters)
c.
20 yards (15.3 cubic meters)
d.
30 yards (23 cubic meters)
44. Which of the following trailer types is required to haul liquid asphalt?
a.
drop belly dump
b.
dry bulk, pressure hopper
c.
hot material, tanker
d.
refrigerated tanker
45. What is most commonly used to pressurize a dry bulk pressure hopper to blow off loads?
a.
truck PTO pump
b.
trailer PTO pump
c.
truck PTO compressor
d.
trailer PTO compressor
46. Which of the following must be true of milk tanker trailer?
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
47. What type of liner is required in an acid tanker?
a.
stainless steel
b.
non-reactive
c.
non-toxic
d.
mild steel
b
48. Technician A says that 16.5-inch by 7-inch brakes are the most common size found on trailer S-cam actuated brakes.
Technician B says that many trailer manufacturers are adopting wedge brakes due to their lower maintenance costs. Who
is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
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49. Technician A says that power line carrier (PLC) permits multiplexing to take place between a trailer and the tractor
data bus on a non-dedicated wire. Technician B says that PLC messages are RF-superimposed over the blue 12-volt
auxiliary power supply between the tractor and trailer. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
50. When a semi-trailer bogie is moved either forward or rearward, what is changed?
a.
length of trailer
b.
trailer bridge formula
c.
tractor bridge formula
d.
all of the above
b
51. If a bogie is moved forward on a semi-trailer, which of the following will be true?
a.
percentage of trailer load supported by tractor rear suspension increases
b.
percentage of trailer load supported by trailer suspension decreases
c.
percentage of trailer load supported by trailer suspension increases
d.
percentage of trailer load supported by tractor front suspension increases
52. When a sliding trailer bogie is used, how many mechanical locking pins are used on a typical unit?
a.
one
b.
two
c.
four
d.
eight
53. Technician A says that the most common cause of trailer landing gear failures is crank gear tooth failure. Technician
B says that landing gear is designed to sustain vertical weight forces and not the effects of the horizontal ramming that
takes place during coupling. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
b
54. How should trailer hand-crank landing gear legs and crankcase be lubricated?
a.
multi-purpose gear lube
b.
SAE 30W engine oil
c.
grease applied through zerks
d.
penetrating oil
55. What legislation governs trailer lighting standards in the United States?
a.
FMVSS-101
b.
FMVSS-108
c.
FMVSS-121
d.
FMVSS-180
b
56. Which of the following has greatly reduced trailer lighting circuit problems?
a.
silicone RTV
b.
black electrical insulating tape
c.
shrink wrap
d.
LED light units
d
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57. Which of the following AWG wiring sizes is the minimum that should ever be used on any trailer light circuit?
a.
12 gauge
b.
16 gauge
c.
18 gauge
d.
20 gauge
58. 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?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
d
59. Technician A says that the red and white reflective tape required by the NHTSA on trailers should be adhered as close
to 6 feet (1.8 meter) above road level as possible. Technician B says that this reflective tape is known as conspicuity tape.
Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
b
60. What on-trailer device is used to track trailer mileage for purposes of maintenance scheduling?
a.
odometer
b.
tractor data bus
c.
hubdometer
d.
trailer data bus
61. Which of the following would be more likely to result in flat spots on trailer tires?
a.
unbalanced braking
b.
wheel hop
c.
uneven trailer loading
d.
suspension lean
62. Which trailer valve receives air from the trailer air tanks and routes it to the service brake chambers to apply and
release the service brakes?
a.
two-way check valve
b.
service relay valve
c.
spring brake control valve
d.
pressure protection valve
b
63. What activates the signal used to actuate trailer service braking?
a.
dash valve
b.
trailer hand valve
c.
foot valve
d.
either b or c
d
64. What is used as the control signal for the spring brake relay valve on a trailer?
a.
blue knob on dash
b.
yellow knob on dash
c.
red knob on dash
d.
trailer hand control valve
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65. What is the function of a trailer pressure protection valve?
a.
maintain reservoir pressure
b.
maintain pressure in the service line
c.
maintain pressure in the supply line
d.
maintain pressure in the brake chamber
66. A trailer with two air tanks suffers a total loss of pressure in one reservoir. Which of the following should prevent
immediate dynamiting of the trailer brakes?
a.
service brake relay valve
b.
spring brake control valve
c.
pressure protection valve
d.
hold-off quick release valve
67. If a trailer is equipped with a service brake priority air system and all its reservoirs are empty, which of the following
must occur before the trailer brakes can be released?
a.
all service chambers must be charged
b.
air tanks must be charged to 60 psi before the hold-off circuit is charged
c.
the service signal circuit must be activated
d.
spring brakes over one axle must be caged
68. What is the FMVSS-121 minimum required stopping distance for a tractor-trailer semi rig built after 2010?
a.
125 feet
b.
250 feet
c.
350 feet
d.
500 feet
69. When system air pressure is routed into the trailer hold-off circuit, the parking brakes are:
a.
50% applied
b.
100% applied
c.
50% released
d.
fully released
70. What is the reason for modulating hold-off pressure in the spring brake circuit?
a.
faster park/emergency brake application
b.
modulated park/emergency brake application
c.
more aggressive service braking
d.
modulated service braking
71. 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?
a.
ball peen hammer
b.
rivet set
c.
cold chisel
d.
bucking bar
72. Technician A says that the bucked side of a rivet is usually countersunk. Technician B says that any bucked head
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should be formed with an even radius. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B