Deck 21: Design Considerations

Question 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 1

B

Question 2

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 2

C

Question 3

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 3

C

Question 4

In matched-mold design, the parameters are similar to ____.

A) compression molding
B) injection molding
C) liquid resin molding
D) fluid molding

Question 5

Some reinforced plastics are nearly as rigid and strong as most ____ and may be even more dimensionally stable.

A) concrete products
B) wood products
C) steel
D) copper products

Question 6

Parting lines are usually placed at the ____ of the molded part.

A) top
B) softest part
C) greatest radius
D) bottom

Question 7

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

Question 8

Slight undercuts could be tolerated in some products when using ____.

A) small products
B) thermoplastic material
C) tough, elastic materials
D) colored products

Question 9

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

Question 10

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

Question 11

In considering economics, the most meaningful comparison between different plastics is cost per ___. 

A) cubic centimeter
B) kilogram
C) item
D) pound

Question 12

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

Question 13

What material is usually used to make blow molds because it is relatively inexpensive?

A) aluminum
B) copper
C) beryllium
D) steel

Question 14

Which plastics has no known brittle point?

A) acrylic
B) epoxy
C) PVC
D) ABS

Question 15

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