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Copyright Cengage Learning. Powered by Cognero.
Page 1
1. The company Moldflow® is prominent in the field of ____.
a.
rapid prototyping
b.
computer-aided flow analysis
c.
computer-aided design
d.
computer-aided engineering
ANSWER:
b
2. Building a shape with the use of many thin layers falls within the category of ____.
a.
rapid prototyping
b.
computer-aided flow analysis
c.
computer-aided design
d.
computer-aided engineering
ANSWER:
a
3. Although specifications are stated as standards in some organizations like ASTM, the use of standards would be
simplified by ____.
a.
computerization
b.
agreement among technical societies
c.
metrication
d.
more standardization
ANSWER:
c
4. In designing a plastics product, it is important to keep the function of the final product in mind, since plastics are so
sensitive to ____.
a.
stress
b.
cold
c.
heat
d.
acidity
ANSWER:
c
5. Fluorocarbons, silicones, polyimides, and filled plastics must be used for products that will be subjected to ____.
a.
high UV
b.
heat
c.
cold
d.
high tensile strength
ANSWER:
b
6. In ____, the sprues and runners are kept hot by heating elements built into the mold.
a.
insulated runner molding
b.
runnerless molding
c.
heated torpedo molding
d.
hot runner molding
ANSWER:
d
Name:
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Date:
Chapter 21: Design Considerations
Copyright Cengage Learning. Powered by Cognero.
Page 2
7. In mold design, narrow channels that convey the molten plastics from the sprue to each cavity are called ____.
a.
edge gates
b.
runners
c.
pinpoint gates
d.
locating rings
ANSWER:
b
8. Of the compression mold designs, the ____ mold is the least complex and most economical from the standpoint of
original mold cost.
a.
flash
b.
semipositive
c.
positive
d.
horiztonal
ANSWER:
a
9. What material is usually used to make blow molds because it is relatively inexpensive?
a.
aluminum
b.
copper
c.
beryllium
d.
steel
ANSWER:
a
10. Parting lines are usually placed at the ____ of the molded part.
a.
top
b.
softest part
c.
greatest radius
d.
bottom
ANSWER:
c
11. In matched-mold design, the parameters are similar to ____.
a.
compression molding
b.
injection molding
c.
liquid resin molding
d.
fluid molding
ANSWER:
a
12. Slight undercuts could be tolerated in some products when using ____.
a.
small products
b.
thermoplastic material
c.
tough, elastic materials
d.
colored products
ANSWER:
c
13. Some reinforced plastics are nearly as rigid and strong as most ____ and may be even more dimensionally stable.
Name:
Class:
Date:
Chapter 21: Design Considerations
Copyright Cengage Learning. Powered by Cognero.
Page 3
a.
concrete products
b.
wood products
c.
steel
d.
copper products
ANSWER:
c
14. In considering economics, the most meaningful comparison between different plastics is cost per ___.
a.
cubic centimeter
b.
kilogram
c.
item
d.
pound
ANSWER:
a
15. Which plastics has no known brittle point?
a.
acrylic
b.
epoxy
c.
PVC
d.
ABS
ANSWER:
a
