Chapter Tests
and Problems
ChaPTer16 MeChanisMs:
Linkages, CaMs, gears,
andBearings TesT
INSTRUCTIONS
Answer the questions with short, complete statements or
drawings as needed.
QUESTIONS
1. Draw a four-bar linkage and label the four links.
2. List at least two uses for a slider crank mechanism.
3. Explain why schematic symbols are used for linkage
drawings.
4. The total movement or displacement of a slider mechanism
is called _________________________________________.
5. Describe the function of a cam mechanism.
6. List three types of cam mechanisms.
7. Explain the relationship of the motion of the cam follower
to the cam shaft for the three types of cams described in
Question 6.
8. Name the most commonly used cam follower.
9. Describe the purpose of the cam displacement diagram and
how it relates to the cam profile construction.
10. List at least four types of cam motion.
11. What type of cam motion is best for smooth-running high-
speed applications?
12. Which type of cam motion is suited for only very slow speed
applications?
13. Explain why constant velocity motion is modified with a
curve at the bottom and top of the period.
14. The length of the displacement diagram for a drum cam is
equal to _________________________________________.
15. Define gear.
16. List at least two functions of a gear.
17. Identify the parts of the spur gear shown in the drawing
below.
18. List three types of parallel shafting gears.
19. Describe the function of a bevel gear.
20. Describe the function of a worm gear and worm.
21. Given a spur gear with 54 teeth, diametral pitch of 6, and a
pitch diameter of 9.000 in., calculate the following:
a. Addendum
b. Dedendum
c. Circular pitch
d. Outside diameter
e. Root diameter
f. Circular thickness
g. Chordal thickness
h. Base circle diameter
22. What is the gear ratio if the gear in Question 21 mates with
a pinion having 18 teeth?
23. Explain the difference between plain and roller element
bearings.
24. What is the best material for use in the manufacture of plain
bearings?
25. Describe the difference between shielded and sealed
bearings.
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Chapter 16
Mechanisms: Linkages, Cams, Gears, and Bearings
Answers to End-of-Chapter Test Questions
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