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1. Machining techniques for composite materials, such as high-pressure laminates, involve backing up the work with a
solid material to reduce____.
a.
laser cutting
b.
prevention of fraying
c.
control of fine dust
d.
prevention of burning
ANSWER:
b
2. Thicker plastics (over 6 mm) require ____ teeth per centimeter when cutting (sawing).
a.
greater than 12
b.
at least 45
c.
more
d.
fewer
ANSWER:
d
3. The rake on the bit for drilling polyethylene should be ____ degrees.
a.
0
b.
45
c.
90
d.
120
ANSWER:
a
4. The punching and shearing of laminar composite materials usually results in ____.
a.
clogging
b.
splitting
c.
delamination
d.
gumming
ANSWER:
c
5. When machining plastics, it is best to use cutting tools usually used for machining brass and ____.
a.
carbide
b.
aluminum
c.
steel
d.
wood
ANSWER:
b
6. A milling operation in which the work moves in the same direction as the rotating cutter is____ milling.
a.
coarse
b.
sequential
c.
climb
d.
spindle
ANSWER:
c
7. Laser power can be controlled to merely ____ the plastics surface or actually vaporize and melt it.
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a.
thread
b.
machine
c.
drill
d.
etch
ANSWER:
d
8. Induced fracture methods for cutting plastics are similar to those for cutting ____.
a.
glass
b.
wood
c.
aluminum
d.
carbide
ANSWER:
a
9. Abrasive grinding is more easily accomplished on ____ materials.
a.
thermoplastic
b.
foamed
c.
thermosetting
d.
laminate
ANSWER:
c
10. Polishing plastics (burnishing) uses ____ compounds to produce a polished surface.
a.
pumice
b.
grit
c.
sand
d.
wax
ANSWER:
d
11. Flame polishing is used to finish the edges of thermoformed or fabricated ___ products.
a.
epoxy
b.
—-acrylic
c.
laminate
d.
styrene
ANSWER:
b
12. In a tumbling-barrel process, the smoothing agent is a(n) ____ and a lubricant.
a.
abrasive
b.
wax
c.
epoxy
d.
ash
ANSWER:
a
13. For some plastics and composites, the internal stresses of production may be reduced or eliminated by____, which
consists of prolonged heating of the plastics part at a temperature lower than the molding temperature.
a.
burnishing
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b.
milling
c.
annealing
d.
flame polishing
ANSWER:
c
14. Which machining task would be done on abrasive-charged wheels?
a.
tapping
b.
drilling
c.
cutting
d.
buffing
ANSWER:
d
15. Solvent-dip polishing of cellulosic and ____ plastics may be used to dissolve minor surface defects.
a.
acrylic
b.
laminate
c.
thermosetting
d.
epoxy
ANSWER:
a
16. The rake on this circular saw blade is ____.
a.
centered
b.
negative
c.
positive
d.
zero
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ANSWER:
d
17. A ____ bandsaw blade features a wide gullet, which provides ample space for plastics chips to be carried out of the
kerf.
a.
straight tooth
b.
standard tooth
c.
skip tooth
d.
hooked tooth
ANSWER:
c
18. Which drilling operation is shown below?
a.
spotfacing
b.
counterboring
c.
countersinking
d.
reaming
ANSWER:
b
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19. The milling operation shown here is known as ____.
a.
laser cutting
b.
thermal cutting
c.
climb milling
d.
induced fracture cutting
ANSWER:
c
20. The milling operation shown here is known as ____.
a.
laser cutting
b.
thermal cutting
c.
climb milling
d.
induced fracture cutting
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ANSWER:
d