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1. Which of the following describes the role of a trailer upper coupler?
a.
built into the truck frame and pivots fore and aft
b.
built into the trailer frame and contains the kingpin
c.
supports all of the trailer load
d.
supports none of the trailer load
b
2. When a semi-trailer is properly coupled to a highway tractor, what trailer component transfers its weight to the tractor
chassis?
a.
kingpin
b.
landing gear
c.
bolster plate
d.
fifth wheel plate
3. Which type of fifth wheel is most commonly used on linehaul highway tractors?
a.
compensating fifth wheels
b.
semi-oscillating fifth wheels
c.
fully-oscillating fifth wheels
d.
elevating fifth wheels
b
4. Which of the following applications would benefit from the use of a compensating fifth wheel?
a.
B-train lead trailer with aluminum frame
b.
A-train lead trailer with pintle hook
c.
yard shunt
d.
pick-up and delivery tractor
5. When a sliding fifth wheel is used on a highway tractor, which of the following positions would place the most weight
on the tractor front axle?
a.
full travel forward
b.
directly over the bogie centerline
c.
slightly to the rear of the bogie centerline
d.
full travel rearward
6. When a sliding fifth wheel is used on a tractor, which position would most likely provide the driver with the most
comfortable ride?
a.
full travel forward
b.
over the bogie centerline
c.
slightly behind of the bogie centerline
d.
full travel rearward
b
7. How often should a fifth wheel be serviced if the OEM recommendations are adhered to?
a.
every 10,000 miles (16,000 km)
b.
every 100,000 miles (160,000 km)
c.
every 50,000 miles (80,000 km)
d.
every 30,000 miles (48,000 km)
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d
8. Which of the following is the correct method of adjusting a Holland B-lock 5th wheel?
a.
lock closed, rotate rubber bushing by hand. If tight, turn adjusting nut CCW until snug
b.
lock closed, rotate rubber bushing by hand. If tight, turn adjusting nut CW until snug
c.
jaws open, rotate rubber bushing by hand. If loose, turn adjusting nut CCW until snug
9. Which of the following lubricants should be used to grease a fifth wheel?
a.
water-resistant lithium-base grease
b.
80/90 gear lube
c.
any type of axle grease
d.
85/140 axle lube
10. Which of the following types of fifth wheels is capable of altering the weight over the tractor rear axles?
a.
semi-oscillating
b.
sliding
c.
compensating
d.
no-slack, semi-oscillating
b
11. Which of the following is the preferred method of attaching a fifth-wheel base plate to a truck frame?
a.
weld 5th wheel base plate directly to the frame using AWS E-7018 electrodes or MIG equivalent
b.
bolt angle iron sections to the frame rails and weld 5th wheel base plate to the angle iron sections
c.
MIG weld base plate to rail flanges
d.
bolt base plate to the rail flanges
b
12. What of the following would be more likely to cause an upper coupler bolster plate to become distorted into ripples?
a.
improper welding procedure during assembly
b.
trailer consistently overloaded
c.
occasional on/off-road use
d.
lack of lubrication
13. Which of the following are the two SAE standard size kingpins?
a.
2-inch and 3-inch
b.
3-inch and 4-inch
c.
2-inch and 3 1/2-inch
d.
2 1/2 inch and 3 1/2 inch
14. Which of the following 5th wheels is designed to articulate on two planes, transverse and longitudinal?
a.
semi-oscillating
b.
fully-oscillating
c.
compensating
d.
sliding
15. Which type of 5th wheel is designed to articulate on all planes?
a.
semi-oscillating
b.
fully-oscillating
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c.
compensating
d.
sliding
b
16. Which of the following applications would be most likely to use a fully oscillating 5th wheel?
a.
B-train lead
b.
high center of gravity hopper
c.
low center of gravity goose-neck
d.
C-train lead
17. If a rigid 5th wheel is used on a tractor, to which of the following applications would it likely be coupled to?
a.
high rigidity tanker monocoque
b.
frameless dump with oscillating bolster plate
c.
C-train lead trailer
d.
low bed gooseneck
b
18. Technician A says that a sliding 5th wheel should be installed on a tandem drive tractor so that its furthest point of
forward travel is directly over the bogie centerline. Technician B says that a sliding 5th wheel should be installed on a
tandem drive tractor so that its rearmost point of travel should be directly over the rear drive axle centerline. Who is
correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
d
19. Technician A says that the position a sliding 5th wheel is located on a tractor affects the tractor bridge formula.
Technician B says that the position a sliding 5th wheel is located on a tractor affects the trailer bridge formula. Who is
correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
20. When a tractor sliding 5th wheel is inappropriately placed, which of the following can result?
a.
weight-over-axle infractions
b.
unbalanced bridge formula
c.
uncomfortable ride
d.
all of the above
d
21. Which of the following companies is NOT a manufacturer of highway 5th wheels?
a.
Jost
b.
Fontaine
c.
SAF Holland
d.
Spicer Dana
d
22. Which of the following 5th wheels has a locking mechanism with a small number of moving components?
a.
Simplex
b.
Holland B-lock
c.
Holland A-lock
d.
Fontaine No-slack
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23. Which 5th wheel uses a TouchLoc locking mechanism?
a.
Fontaine No-slack
b.
Holland XA-SII (Simplex II)
c.
Holland B-lock
d.
Holland A-lock
24. What lubricant do SAF Holland recommend should be applied to the rack and bracket slide path of sliding 5th wheels
when serviced?
a.
paste on chassis grease
b.
spray on 80/20 mixture of engine oil and diesel fuel
c.
spray on 80/20 mixture of diesel fuel and engine oil
d.
paint on API GL-5 gear lube
25. Technician A says that an upper coupler kingpin template is used to verify that a kingpin is in satisfactory condition.
Technician B says that a kingpin plug is used both when testing and reassembling 5th wheels. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
26. Which of the following describes what usually causes a high hitch condition?
a.
kingpin sits on fifth wheel deck plate
b.
kingpin sits on top of lock jaws with locks fully engaged
c.
kingpin sits on top of lock jaws with locks not engaged
d.
kingpin misses 5th wheel throat entirely
27. When you are about to couple a tractor 5th wheel to a trailer upper coupler, which of the following must be true?
a.
trailer bolster plate should be about 1-inch higher than 5th wheel plate
b.
trailer bolster plate should be about 1-inch lower than 5th wheel plate
c.
5th wheel jaws should in their closed position
d.
5th wheel secondary lock should be in latched closed position
28. Before uncoupling a tractor from a semi-trailer, which of the following should be done?
a.
ensure the trailer parking brakes are released
b.
apply the trailer service brakes
c.
lower the trailer dolly legs and raise to take some weight off the tractor
d.
ensure the 5th wheel main and secondary locks are both fully engaged
29. Technician A says that when bolting 5th wheel angle iron brackets to a tractor frame the bolts should be spaced 12-
inches apart. Technician B says that 5th wheel angle iron brackets should be bolted to a tractor frame using SAE Grade 8
bolts of at least 5/8-inch. 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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b
30. When fitting a fifth wheel to a truck frame, what is the minimum distance ahead of the 5th wheel pivot centerline the
angle iron brackets should extend?
a.
6-inches
b.
12-inches
c.
18-inches
d.
24-inches
31. When fitting a fifth wheel to a truck frame, what is the minimum distance behind the 5th wheel pivot centerline the
angle iron brackets should extend?
a.
6-inches
b.
12-inches
c.
18-inches
d.
24-inches
b
32. How are most current kingpins attached to the upper coupler assembly?
a.
rivets
b.
SAE Grade 8 bolts
c.
welding
d.
SAE Grade 5 bolts
33. Technician A says that when a kingpin is welded to an upper coupler, it should be stitch welded in one direction of
rotation. Technician B says that an AWS E-11018 electrode is recommended. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
34. When an E-7018 electrode is used to weld a kingpin to an upper coupler plate, which of the following is true of the
resulting weld deposit?
a.
it will fracture dead center
b.
it will fracture at the sides of the weld profile
c.
it evenly dilutes the harder kingpin base material with the upper coupler base material
d.
it becomes contaminated with carbon slag from the kingpin base material
35. When a kingpin flange is bolted to a upper coupler plate, what fasteners are recommended?
a.
5/8-inch Grade 5
b.
5/8-inch Grade 8
c.
3/4-inch Grade 5
d.
3/4-inch Grade 8
d
36. What is the main advantage of using a tapered, removable kingpin?
a.
removable in applications where a fixed kingpin could be damaged
b.
can couple into both 2-inch and 3.5-inch standard fifth wheel jaws
c.
reduces longitudinal thrust forces
d.
reduces tractor to trailer torque twist effect
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37. Technician A says that when the kingpin on a trailer upper coupler wears out, it should be replaced. Technician B says
that some OEMs recommend a new repair welding technique to recondition a kingpin rather than rebuild the upper
coupler. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
38. What is the usual cause of a bowed upper coupler bolster plate?
a.
high hitch coupling
b.
overloading
c.
aggressive tractor coupling
d.
not setting landing gear height before coupling
b
39. In an A-train combination, what does a drawbar eye connect to?
a.
tractor 5th wheel
b.
tractor pintle hook
c.
lead trailer pintle hook
d.
pup trailer pintle hook
40. Technician A says that some pintle hooks use hydraulic buffers to limit the effects of trailer ram under braking.
Technician B says that some pintle hooks use pneumatic buffers to limit the effects of trailer ram under braking. Who is
correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
41. Which of the following terms is used to describe the means of buffering trailer bump on a pintle hook assembly?
a.
shock absorber
b.
snubber
c.
jounce block
d.
rebound accumulator
b
42. What is the maximum hook to latch clearance permitted on highway pintle hook assembly?
a.
3/8 inch (10 mm)
b.
1/2 inch (12.5 mm)
c.
3/4 inch (19 mm)
d.
1-inch (25 mm)
43. Technician A says that hydraulic snubbers on pintle hook assemblies are more common on highway truck trailer
applications. Technician B says that pneumatic snubbers on pintle hook assemblies are more common on off-highway
applications. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
d
44. Technician A says that ball hitches cannot be used on highway tractor-trailer combinations. Technician B says that a
standard drawbar eye can be connected to a heavy-duty ball hitch. Who is correct?
a.
Technician A only
b.
Technician B only
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c.
Both A and B
d.
Neither A nor B
45. What type of lubricant should be applied to the horn of a pintle hook to maximize its service life?
a.
Heavy-duty axle grease
b.
Lithium grease
c.
Diesel fuel
d.
No lubricant is required