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Chapter 34
End of Chapter Review Questions Answer Key
1. Which type of fifth wheel is most commonly used on highway tractors?
2. Which of the following is an advantage of a sliding fifth wheel?
3. Which type of fifth wheel permits articulation at any angle for use with gooseneck
trailers operated on roughterrain?
4. How many fifth wheels would a standard B-train combination rig have in total?
5. Which type of fifth wheel uses a locking mechanism with a pair of transversely
opposed lock jaws?
6. Technician A uses a double-angle inboard-outboard mount when mounting a fifth
wheel assembly that has no mounting plate. Technician B welds fifth wheel deck plate
assemblies to the frame mounting angle iron. Who is correct?
7. SAF-Holland recommends that a fifth wheel should be inspected every:
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8. When lubricating the fifth wheel, Technician A lubricates all moving parts with
water-resistant, lithium-based grease. Technician B lubricates the rails on a sliding
fifth wheel with a mixture of oil and diesel fuel. Who is correct?
9. When using angle iron to mount fifth wheel brackets to a tractor frame, which of the
following methods is recommended?
10. What is the maximum horizontal movement permitted at the fifth wheel before it can
be considered CVSA OOS?
11. To ensure that the tractor and trailer are properly coupled by the fifth wheel, check by:
12. Which is the most common method of attaching a kingpin to a trailer upper coupler
assembly?
13. Trailer weight is transferred to the fifth wheel plate by which of the following?
14. Which type of fifth wheel is designed to minimize the effect of trailer twist on the
tractor frame?
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15. The air-release slide mechanism is preferred over the manual release when:
16. Fifth wheel height is defined as:
17. What is the intended operating height of the bolster plate on most trailer upper
couplers in highway use?
18. What is the normal maximum vehicle height on a tractor/trailer combination used on
our highways?
19. Which of the following dimensions is equivalent to a standard SAE kingpin size?
20. Technician A says that when a sliding fifth wheel is moved forward on a tractor, the
percentage of total vehicle weight supported by the trailer is reduced. Technician B
says that when a tractor sliding fifth wheel is moved rearward, weight is removed
from the tractor steer axle. Who is correct?