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1. One way in which casting differs from extrusion or molding is that casting ____.
a.
is initiated as a solid
b.
uses atmospheric pressure to fill the mold
c.
uses at least 300 psi to fill the mold
d.
uses PC and PP materials
ANSWER:
b
2. Which materials, used for casting, typically harden by a chemical reaction to complete the polymerization for
thermoplastics or the cross-linking for thermosets?
a.
plastisols
b.
hot-melt plastics
c.
dissolved plastics
d.
short-chain polymers
ANSWER:
d
3. Which materials have plastics particles that are suspended in a plasticizing solvent?
a.
plastisols
b.
hot-melt plastics
c.
dissolved plastics
d.
short-chain polymers
ANSWER:
a
4. When plastics pieces are dissolved in a volatile solvent in casting, hardening occurs as a result of _____.
a.
catalysts
b.
added heat
c.
solvent evaporation
d.
high pressure
ANSWER:
c
5. The most well-known casting resin for simple casting is probably ____because it is used in crafts and hobby work.
a.
epoxy
b.
polyester resin
c.
acrylic
d.
polyurethane
ANSWER:
b
6. Polyester casting resins can be extended with ____.
a.
epoxy
b.
acrylic
c.
water
d.
polyurethane
ANSWER:
c
7. Cultured marble is a product that contains marble dust or ____ as the filler and polyester plastics as the binding
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material.
a.
polymerized resin
b.
epoxy
c.
silicones
d.
limestone
ANSWER:
a
8. Acrylic sheets are often produced by pouring a catalyzed monomer or partially polymerized resin between ____.
a.
two parallel plates of glass
b.
the halves of a mold
c.
two other pieces of formed acrylic
d.
sheets of Teflon
ANSWER:
a
9. Skiving is a process that is best described as ____.
a.
pouring
b.
peeling
c.
molding
d.
slicing
ANSWER:
d
10. A preserved plant specimen is likely to be displayed by the process of ____.
a.
skiving
b.
potting
c.
encapsulation
d.
embedment
ANSWER:
d
11. Which simple casting process is used to protect electrical and electronic components from harmful environments?
a.
skiving
b.
potting
c.
encapsulation
d.
embedment
ANSWER:
b
12. What is an important advantage of simple casting?
a.
material costs are relatively low
b.
dimensional accuracy is excellent
c.
additives used are safe
d.
cycle time is short
ANSWER:
a
13. The process of film casting combines plastics granules, plasticizers, solvents and other additives and pours them onto
a belt. The film is produced by the evaporation of ____.
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a.
granules
b.
water
c.
solvent
d.
plasticizers
ANSWER:
c
14. Hot-melt casting can be used to ____.
a.
seal pipes
b.
create gaskets
c.
make nonstick coatings
d.
insulate parts of a motor
ANSWER:
d
15. The process of static casting begins with ____.
a.
powders
b.
liquid casting materials
c.
plastisols
d.
organosols
ANSWER:
a
16. Slush-cast items are hollow with an opening such as in a(n) ____.
a.
bowl
b.
clamshell packaging
c.
syringe bulb
d.
spindle
ANSWER:
c
17. Commercial molds for slush casting are usually made from ____ because it allows rapid cycling and lower tooling
costs.
a.
aluminum
b.
wood
c.
acrylic
d.
copper
ANSWER:
a
18. Examples of products made from static casting are ____.
a.
syringe bulbs
b.
hollow toys
c.
large pipes
d.
large storage containers
ANSWER:
d
19. Rotational casting relies on ____ to create plastics products.
a.
gravity
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b.
centrifugal force
c.
vibration
d.
evaporation
ANSWER:
b
20. In rotational casting, the wall thickness in different areas may be controlled by ____.
a.
gravity
b.
centrifugal force
c.
rotation speed
d.
evaporation
ANSWER:
c
21. What is an example of a dip-cast product?
a.
spark plug covers
b.
large containers
c.
spindles
d.
gaskets
ANSWER:
a