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1. What is the specified yield strength of a Class 8 truck frame with a tempered steel alloy frame?
a.
70,000 psi (480 MPa)
b.
110,000 psi (760 MPa)
c.
80,000 psi (550 MPa)
d.
140,000 psi (965 MPa)
b
2. What is the function of the crossmembers that unite a pair of rails in a truck suspension?
a.
provide a mounting point for chassis sub-components
b.
limit the torsional forces a frame is subjected to
c.
unite the rails so that forces are transmitted and shared between them
d.
all of the above
d
3. On a ladder type highway tractor frame, what components are referred to as the rails?
a.
webs
b.
the two longitudinal members
c.
upper and lower flanges
d.
the transverse members
b
4. Which of the following on a highway tractor I- or C-channel frame rail is vertical?
a.
flange
b.
web
c.
gusset
d.
all of the above
b
5. When selecting a welding method and filler wire or electrode to repair a cracked frame rail, which of the following
must be considered?
a.
minimizing loss of temper
b.
avoiding crystallization
c.
matching the filler wire or electrode to the rail material
d.
all of the above
d
6. When reinforcing frame rails to support increased loads, what other factors should be taken into account?
a.
suspension weight rating
b.
axle weight rating
c.
brake capacity
d.
all of the above
d
7. Technician A says that a tempered frame rail repair that has failed by cracking cleanly through the center of what
visually appears to be a good weld could be caused by using the incorrect filler rod. Technician B says that cracks that
appear at the sides of what appears to be a good weld on a tempered frame rail can be caused by crystallization. Who is
correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
8. Which of the following welding practices is most likely to produce a crystallization failure on a repair of tempered
frame rail?
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a.
welding too slowly
b.
not allowing sufficient cooling time between weld runs
c.
insufficient penetration
d.
using a vertical-up welding technique
9. If you do not grind the weld profile flush after making a weld repair to a truck frame, which of the following is altered
in a way that can cause another failure?
a.
section modulus is reduced through a given frame section
b.
section modulus is increased through a given frame section
c.
tensile strength is reduced through a given frame section
d.
tensile strength is increased through a given frame section
10. When it is necessary to drill into frame rails, all of the following practices should avoided EXCEPT?
a.
drilling two holes in vertical alignment with each other
b.
drilling two holes in horizontal alignment with each other
c.
drilling in the flanges
d.
marking drill locations with a steel scriber
11. Which of the following is true regarding about RBM (resist bend moment) as it applies to heavy truck frames?
a.
product of section modulus and material strength
b.
specifies frame flexibility
c.
should be used stand-alone to spec frames because it factors both strength and flexibility
d.
all of the above
12. When diagnosing suspected frame misalignment, which of the following should be performed before projecting the
frame measurements to the floor?
a.
wheel alignment
b.
check for matching wheels and tires
c.
check for visible damage the axles
d.
all of the above
13. When it is necessary to repair-weld a damaged frame rail, on which of the following frames is it recommended that
you clamp a “chill strip” on the opposite side of the area being welded?
a.
tempered aluminum frames only
b.
tempered steel frames only
c.
mild steel frames only
d.
both A and B are correct
14. When it is necessary to reinforce a C-channel truck frame rail, all of the following practices are recommended
EXCEPT?
a.
reinforcement material should match the tensile strength of the frame rail
b.
reinforcement plates should be angled and radiused to avoid sudden changes in SM
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c.
reinforcements should be welded to the frame rail
d.
reinforcements can be added to either the outside or the inside of the frame
15. When you have to cut tempered frame rails to extend a frame, which of the following angles would be recommended?
a.
90 degrees
b.
75 degrees
c.
80 degrees
d.
60 degrees
16. Which of the following terms describes the maximum stress a material can withstand without permanent deformation
and damage?
a.
yield strength
b.
resist bend moment (RBM)
c.
tensile strength
d.
applied moment
17. Which of the following truck frame materials has the highest yield strength?
a.
copper-aluminum alloy
b.
magnesium-silicon-aluminum alloy
c.
mild steel
d.
HSLA steel (high-strength low-alloy)
18. When carrying very heavy loads is the primary consideration in choosing a highway tractor frame, which of the
following would be the best choice?
a.
deep-section, 3/8” (10 mm) double rail, tempered steel frame
b.
high-strength magnesium-silicon-aluminum alloy frame
c.
non-fish-plated, middle alloy steel
d.
pressed box-section ladder frame with drop-style crossmembers
19. Which of the following would most likely be used as a frame for a linehaul truck?
a.
ladder C-channel frame with 10.25-inch (260 mm) depth rails, crossmember braced
b.
ladder C-channel frame with 13.50 (350 mm) depth rails, trunnion braced
c.
ladder box-section frame with a 10.25 (260 mm) section and tubular bracing
d.
ladder I-beam frame with 13.50 (350 mm) web and crossmember bracing
20. Technician A says that the section modulus (SM) of a frame member is a measure of its twistability. Technician A
says that the higher the section modulus the more rigid a frame member is. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
21. Technician A says that two truck frame rails with exactly equal RBMs, can have very different dynamic performance.
Technician B says that highway tractors are required to have much higher section modulus (SM) than dump trucks. 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
22. Which of the following truck chassis components would likely have the highest section modulus (SM)?
a.
I-beam frame rail
b.
C-channel frame rail
c.
cylindrical fuel tanker
d.
unibody trailer van
23. Technician A says that in some tanker trailer applications, the tank can be used as the primary frame, with sub-frames
attached to the tank to mount the upper coupler and suspension components. Technician B says that a tank mounted to a
straight truck with a ladder frame must be mounted in a way so that the frame moves independently from the tank. Who is
correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
24. Technician A says that the RBM value of a frame is a measure of its ultimate rigidity. Technician B says that the RBM
value of a frame is a measure of its ultimate strength. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
25. Where is the neutral fiber of a C-channel frame rail located?
a.
flanges
b.
center of the web
c.
at the C-radius
d.
all of the above
b
26. When a load is placed on a truck with a C-channel, ladder frame, which ONE of the following is true of the C-channel
rails?
a.
neutral fiber is under compressional force
b.
upper flange is under tensional force
c.
lower flange is under tensional force
d.
the entire rail is under compressional force
27. If a perfectly round hole was reamed into the neutral fiber of a truck C-channel frame rail and the rail was than
subjected to a within specification load force from above, how would the hole be effected?
a.
should remain perfectly round
b.
elongate vertically
c.
elongate horizontally
d.
should reduce in size
28. When a fully loaded dump box is raised on a dump truck, which section of the frame is subject to the most stress
during the process?
a.
extreme front section
b.
mid-section closest to PTO pump
c.
mid-section closest to lift ram
d.
extreme rear section
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29. Technician A says that the a three-element frame rail can usually achieve a high section modulus (SM) without adding
additional weight. Technician B says that one way of meeting a high RBM requirement and keeping the weight of a frame
to a minimum is to use hardened steel frame rails. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
b
30. When a truck with a C-channel, ladder frame is involved in an offset front end collision, one frame rail is moved
slightly ahead of the other. What is this type of damage known as?
a.
twist
b.
sway
c.
sidesway
d.
diamond
d
31. Technician A says that diamond frame damage is often caused when a ditched truck, is hauled out by attaching chains
to just one side of the frame. Technician B says that twist frame damage can be caused by using a truck as a snowplow.
Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
32. Which type of frame damage is commonly caused by overloading?
a.
sidesway
b.
sag
c.
diamond
d.
twist
b
33. Which of the following AWS welding electrodes should be used to weld a tempered steel, truck frame rail?
a.
E-6010
b.
E-6011
c.
E-7018
d.
E-11018
d
34. Technician A says that low hydrogen arc welding electrodes should be used when it is necessary to weld on a
hardened steel frame rail. Technician B says that tempered steel rails can be MIG welded using appropriately rated wire in
less time and lower risk of comebacks. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
35. What is generally considered the best method when repair welding an aluminum alloy frame rail?
a.
TIG
b.
MIG
c.
shielded arc electrode
d.
oxy-acetylene torch
36. Technician A says that mild steel trailer frames can be welded using MIG welding equipment and general purpose
steel filler wire. Technician B says that when extending a mild steel trailer I-beam ladder frame, the weld must be
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performed at a 45-degree angle. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
37. What is the term used to describe a frame bolt that is designed with an interference-fit shank?
a.
over-size
b.
body-bound
c.
Grade 8
d.
coach
ANSWER:
b
38. A suspension mount bolt hole has become enlarged in a frame due to shear forces. What should be done?
a.
replace the frame
b.
drill oversize to the next bolt size up
c.
ream oversize to the next bolt size up
d.
grind a taper on the bolt and drive in
39. Technician A says that a low section modulus frame (SM) has the advantage of better ride, a desirable feature in
highway tractors. Technician B says that keeping SM low and rail yield strength high, is one way of achieving a highway
tractor frame that has a forgiving ride and high RBM. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
ANSWER:
40. When Huck fasteners are used on a highway tractor frame, what SAE grade rating are they usually equivalent to?
a.
Grade 3
b.
Grade 5
c.
Grade 8
d.
Grade 10
41. Technician A says that when extending a tempered frame rail, the extension channel does not have to be tempered so
long it is at the rear of the truck. Technician B says that when extending a tempered frame rail, either a 45- or 60-degree
cut-angle is recommended to avoid a sudden change in RBM over a given vertical section. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
b
42. Technician A says that the center of a dump truck frame at the lift ram mounting point is subject to the most stress
when the dump box is fully raised. Technician B says that the front and rear of a highway tractor frame is subject to less
stress than the remainder of the frame. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
ANSWER:
b