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Chapter 23
End of Chapter Review Questions Answer Key
1. What is the function of a rear drive axle on a truck?
2. Which of the following gear sets would determine the output gear ratio in a single–
reduction rear axle carrier?
3. Which of the following gear sets performs the first reduction in a double-reduction
differential carrier?
4. Which of the following gear combinations accommodates a speed difference between
the two drive wheels on a drive axle?
5. When a truck is traveling in a straight-ahead direction, which of the following should
be true?
6. Which pinion and crown gear arrangement positions the pinion gear below the
centerline of the crown gear?
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7. Which pinion and crown gear arrangement positions the pinion gear above the
centerline of the crown gear?
8. Which of the following restricts normal differential action except during cornering?
9. What is the usual way of supporting a differential carrier input shaft in front of the
pinion?
10. In which of the following differentials would you find friction plates alternately
splined to a driver and tanged to the gear support case?
11. In which of the following axles would you be likely to find a planetary gearset?
12. In a tandem axle power divider, which component drives the helical gear set?
13. What type of bearing is used as a pilot/spigot for supporting a differential carrier input
shaft behind the pinion?
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14. Which of the following would be a factor in defining the reduction ratio in differential
carrier gearing?
15. Technician A says that during differential action on a drive axle in a turn, the speed
increase on the outboard wheel has to be inversely proportional to the speed decrease
on the inboard wheel. Technician B says that pinion spiders walk at any time there is
differential action. Who is correct?
16. Technician A says that a tag axle on a highway tractor is located in front of a drive
axle or axles. Technician B says that a pusher axle is located behind a drive axle. Who
is correct?
17. Which of the following best describes the two axles on standard tandem trailer?
18. What is the most common method of managing an interaxle differential lockout
device?
19. Technician A says that a single wheel spinout on a tandem drive tractor can destroy a
carrier assembly by shocking the gearing when the spinning wheel finds traction.
Technician B says that a spinout condition can cause a lubrication failure of a final
drive carrier. Who is correct?
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20. Which of the following pavement surfaces would fit the description of a split
coefficient surface?