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

Accepted Answer

Moldflow® is well-known for its computer-aided flow analysis software, which is specifically designed for the analysis of the injection molding process.

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

Accepted Answer

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

Accepted Answer

Plastics are particularly sensitive to heat, which can cause them to melt, deform, or lose their structural integrity.

Question 4

In matched-mold design, the parameters are similar to ____.
A) compression molding
B) injection molding
C) liquid resin molding
D) fluid molding

Accepted Answer

Matched-mold design parameters are similar to those of compression molding, where two mold halves are used to shape the material under heat and pressure.

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

Accepted Answer

Reinforced plastics are often compared to steel in terms of rigidity and strength, making steel the most appropriate comparison among the given options.

Question 6

Parting lines are usually placed at the ____ of the molded part.
A) top
B) softest part
C) greatest radius
D) bottom

Accepted Answer

Parting lines are typically placed at the greatest radius of the molded part to minimize the appearance of the line and to facilitate easier removal of the part from the mold.

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

Accepted Answer

The flash mold is the least complex and most economical from the standpoint of original mold cost because it has a simpler design that allows material to "flash" or escape the mold cavity, reducing the precision required in the mold's construction.

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

Accepted Answer

Undercuts in manufacturing can often be tolerated in products made from tough, elastic materials because these materials can flex or stretch to accommodate the design without breaking or becoming damaged. This elasticity allows for the demolding of parts with slight undercuts without the need for complex mold designs or additional manufacturing steps.

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

Accepted Answer

Runners are the narrow channels in a mold that convey the molten plastic from the sprue (the main channel through which the molten plastic is introduced into the mold) to each of the cavities where the parts are formed.

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

Accepted Answer

Fluorocarbons, silicones, polyimides, and filled plastics are materials known for their ability to withstand high temperatures, making them suitable for products exposed to heat.

Question 11

In considering economics, the most meaningful comparison between different plastics is cost per ___. 
A) cubic centimeter
B) kilogram
C) item
D) pound

Accepted Answer

Cost per cubic centimeter is the most meaningful comparison between different plastics because it takes into account both the volume and density of the plastic. This allows for a more accurate comparison of the cost of different plastics, as it takes into account the amount of material that is being purchased.

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

Accepted Answer

Hot runner molding involves keeping the sprues and runners hot using heating elements built into the mold to ensure the plastic remains molten.

Question 13

What material is usually used to make blow molds because it is relatively inexpensive?
A) aluminum
B) copper
C) beryllium
D) steel

Accepted Answer

Aluminum is commonly used for blow molds due to its relatively low cost, good thermal conductivity, and ease of machining, making it an economical choice for manufacturing processes.

Question 14

Which plastics has no known brittle point?
A) acrylic
B) epoxy
C) PVC
D) ABS

Accepted Answer

Acrylic has no known brittle point because it is a thermoplastic that can be repeatedly softened by heat and hardened by cooling.

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

Accepted Answer

Rapid prototyping involves the construction of physical models using layer-by-layer fabrication from CAD data, which directly aligns with the description of building a shape with the use of many thin layers.

Quiz 21: Design Considerations

The company Moldflow® is prominent in the field of ____.

Although specifications are stated as standards in some organizations like ASTM, the use of standards would be simplified by ____.

In designing a plastics product, it is important to keep the function of the final product in mind, since plastics are so sensitive to ____.

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

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

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

Of the compression mold designs, the ____ mold is the least complex and most economical from the standpoint of original mold cost.

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

In mold design, narrow channels that convey the molten plastics from the sprue to each cavity are called ____.

Fluorocarbons, silicones, polyimides, and filled plastics must be used for products that will be subjected to ____.

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

In ____, the sprues and runners are kept hot by heating elements built into the mold.

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

Which plastics has no known brittle point?

Building a shape with the use of many thin layers falls within the category of ____.