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Chapter 32
End of Chapter Review Questions Answer Key
1. Which of the following is a function of the cross-members of the chassis frame?
2. The longitudinal components of a truck chassis ladder frame are called:
3. The highest stress that a material can stand without permanent deformation or damage
is known as:
4. When a load is applied to a C-channel frame rail from above, which of the following
statements should be true?
5. Which of the following frame materials has the highest yield strength?
6. When a frame is said to have excessive flexibility and twist, which of the following
would do most to repair the problem?
7. Which of the following causes galvanic corrosion between frame members?
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8. Technician A says that most highway tractors use tempered steel, C-channel frame
rails. Technician B says that some aluminum alloy truck frame rails can have up to
twice the yield strength of mild steel. Who is correct?
9. When projecting a frame diagram to a floor when making a frame alignment check,
what tool is used to transfer the reference points on the truck chassis to the floor?
10. What procedure do most manufacturers recommend when a frame rail is damaged?
11. What is the correct procedure and the material used to weld a hardened truck frame
rail extension into position?
12. What are the factors of resist bend moment (RBM)?
13. When C-channel stock is used for a frame reinforcement, which of the following must
be true?
14. When extending a frame, Technician A uses a 60-degree angle butt joint. After
welding a frame extension butt joint, Technician B grinds the weld cap run flush with
the frame. Who is correct?
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15. Which of the following methods would do most to ensure that a frame hole was
exactly 3/4 inch (19 mm) in size?
16. Technician A says that when fifth wheel brackets are bolted to frame rails, the section
modulus over that section of the frame is increased. Technician B says that installing
inverted L-section reinforcements is preferred to L-section reinforcements because the
section modulus is not affected. Who is correct?
17. In bolting equipment to the chassis frame, Technician A uses existing holes whenever
possible. Technician B avoids drilling holes in the frame neutral fiber. Who is
correct?
18. When assembling frame and suspension components, Technician A upgrades all SAE
Grade 5 fasteners to Grade 8. Technician B says that replacing SAE Grade 8 rated
Huck fasteners with Grade 8 nuts and bolts is acceptable. Who is correct?
19. Technician A says that dump trucks usually require a lower section modulus than
highway trucks. Technician B says that tempered frame rails allow highway tractors
to achieve a higher specified RBM with lighter frame rails. Who is correct?
20. A straight truck is involved in an offset collision. Which of the following types of
frame damage would most likely result?