Deck 14: Casting Processes and Materials

Question 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 1

B

Question 2

Skiving is a process that is best described as ____.

A) pouring
B) peeling
C) molding
D) slicing

Answer 2

D

Question 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 3

A

Question 4

A preserved plant specimen is likely to be displayed by the process of ____. 

A) skiving
B) potting
C) encapsulation
D) embedment

Question 5

Rotational casting relies on ____ to create plastics products.

A) gravity
B) centrifugal force
C) vibration
D) evaporation

Question 6

The process of static casting begins with ____.

A) powders
B) liquid casting materials
C) plastisols
D) organosols

Question 7

Slush-cast items are hollow with an opening such as in a(n) ____.

A) bowl
B) clamshell packaging
C) syringe bulb
D) spindle

Question 8

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 ____.

A) granules
B) water
C) solvent
D) plasticizers

Question 9

Cultured marble is a product that contains marble dust or ____ as the filler and polyester plastics as the binding material.

A) polymerized resin
B) epoxy
C) silicones
D) limestone

Question 10

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

Question 11

Examples of products made from static casting are ____.   

A) syringe bulbs
B) hollow toys
C) large pipes
D) large storage containers

Question 12

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

Question 13

Which simple casting process is used to protect electrical and electronic components from harmful environments?  

A) skiving
B) potting
C) encapsulation
D) embedment

Question 14

Polyester casting resins can be extended with ____.

A) epoxy
B) acrylic
C) water
D) polyurethane

Question 15

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

Question 16

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

Question 17

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

Question 18

Hot-melt casting can be used to ____.

A) seal pipes
B) create gaskets
C) make nonstick coatings
D) insulate parts of a motor

Question 19

In rotational casting, the wall thickness in different areas may be controlled by ____. 

A) gravity
B) centrifugal force
C) rotation speed
D) evaporation

Question 20

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

Question 21

What is an example of a dip-cast product?

A) spark plug covers
B) large containers
C) spindles
D) gaskets