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Chapter 13: Reinforcing Processes and Materials
Copyright Cengage Learning. Powered by Cognero.
Page 1
1. A putty-like mixture of resin, catalysts, fillers, and short fiber reinforcements is known as ____.
a.
short fiber compounds
b.
bulk molding compounds (BMC)
c.
reinforced thermoplastics (RTP)
d.
sheet molding compounds (SMC)
ANSWER:
b
2. Bulk molding compounds are often formed into ____ shapes to aid molding and handling operations.
a.
brick
b.
sphere
c.
block
d.
rope
ANSWER:
d
3. Another name for sheet molding compounds (SMC) is ____ mat.
a.
flow
b.
leather
c.
long fiber
d.
glass
ANSWER:
a
4. Which SMC has usually has about 30% of its continuous reinforcing fibers aligned in one direction?
a.
XMC
b.
TMC
c.
UMC
d.
LMC
ANSWER:
c
5. Which product is made from BMC?
a.
circuit boards
b.
heater housings
c.
mattress foam
d.
furniture
ANSWER:
b
6. A significant advantage of matched die processing is that ____.
a.
surfaces are always smooth
b.
transparent products can be produced
c.
both interior and exterior surfaces are finished
d.
molds and tooling are not costly
ANSWER:
c
7. A type of process in which catalyst, resin, and chopped roving are applied simultaneously onto mold shapes is called
____.
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Chapter 13: Reinforcing Processes and Materials
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a.
sheet molding
b.
matched die
c.
hand lay-up
d.
spray-up
ANSWER:
d
8. Rigidized shell spray-up is a process used to create ____.
a.
car top carriers
b.
food containers
c.
thermos jugs
d.
building panels
ANSWER:
a
9. A disadvantage of rigidized vacuum forming is that ____.
a.
it requires several molds
b.
output rates are slow
c.
it has a rough finish
d.
materials are costly
ANSWER:
d
10. A major disadvantage of cold-mold thermoforming is that it____.
a.
requires a high skill level
b.
is unsafe for workers
c.
has a low production rate
d.
requires additional curing time
ANSWER:
d
11. During ____, a plastics film is placed over the layup and a vacuum is drawn between the film and the mold.
a.
cold-mold thermoforming
b.
vacuum-bag processing
c.
sheet molding
d.
rigidized shell spray-up
ANSWER:
b
12. In vacuum-bag processing, if a smooth surface is required on the exterior of a boat hull, a female mold would be
selected, whereas a male mold would probably be selected for a ____.
a.
sink
b.
helicopter blade
c.
automobile hood
d.
bowling ball
ANSWER:
a
13. Pressure-bag processing uses a(n) ____ to force the laminating compound against the contours of the mold.
a.
high air pressure stream
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Chapter 13: Reinforcing Processes and Materials
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b.
balloon
c.
rubber bag
d.
injector
ANSWER:
c
14. What is an advantage of vacuum and pressure bag processing?
a.
short cycle times
b.
quality does not depend on skill of operator
c.
less equipment is needed than in hand layup methods
d.
there is better adhesion in composites
ANSWER:
d
15. What is a process that produces strong parts by applying continuous fibrous reinforcements on a mold in a
predetermined pattern?
a.
filament winding
b.
pressure bagging
c.
vacuum bagging
d.
pultrusion
ANSWER:
a
16. In ____, radio-frequency or microwave heating may also be used to speed production rates as the resin is drawn
through the die.
a.
filament winding
b.
pressure bags
c.
pultrusion
d.
vacuum bags
ANSWER:
c
17. The most widely used reinforcement in pultrusion is ____.
a.
fibrous glass
b.
boron
c.
graphite
d.
polyester
ANSWER:
a
18. What is an example of an item produced by pultrusion?
a.
airfoil
b.
boat hull
c.
skylight
d.
gutters
ANSWER:
d
19. Fibrous-glass-reinforced thermoplastics, available in sheet form, may be cold formed in the same manner as metals
and may someday replace stamped steel in the ____ industry.
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Chapter 13: Reinforcing Processes and Materials
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a.
aeronautic
b.
automotive
c.
steel beam
d.
construction
ANSWER:
b
20. This graphic illustrates the ____ method, such as would be used to create a reinforced bathtub.
a.
cold-mold thermoforming
b.
rigidized vacuum-forming
c.
vacuum bag
d.
rigidized shell spray-up
ANSWER:
b
21. This graphic illustrates the ____ process.
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Chapter 13: Reinforcing Processes and Materials
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Page 5
a.
pultrusion
b.
blown-film reinforcing
c.
filament winding
d.
cold stamping
ANSWER:
a
