Deck 13: Reinforcing Processes and Materials

Question 1

A type of process in which catalyst, resin, and chopped roving are applied simultaneously onto mold shapes is called ____.

A) sheet molding
B) matched die
C) hand lay-up
D) spray-up

Answer 1

D

Question 2

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 2

D

Question 3

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 3

C

Question 4

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

Question 5

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

Question 6

Which product is made from BMC?

A) circuit boards
B) heater housings
C) mattress foam
D) furniture

Question 7

Pressure-bag processing uses a(n) ____ to force the laminating compound against the contours of the mold.

A) high air pressure stream
B) balloon
C) rubber bag
D) injector

Question 8

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

Question 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

Question 10

Which SMC has usually has about 30% of its continuous reinforcing fibers aligned in one direction?

A) XMC
B) TMC
C) UMC
D) LMC

Question 11

Bulk molding compounds are often formed into ____ shapes to aid molding and handling operations.

A) brick
B) sphere
C) block
D) rope

Question 12

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

Question 13

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.

A) aeronautic
B) automotive
C) steel beam
D) construction

Question 14

What is an example of an item produced by pultrusion?

A) airfoil
B) boat hull
C) skylight
D) gutters

Question 15

Rigidized shell spray-up is a process used to create ____.

A) car top carriers
B) food containers
C) thermos jugs
D) building panels

Question 16

Another name for sheet molding compounds (SMC) is ____ mat.

A) flow
B) leather
C) long fiber
D) glass

Question 17

The most widely used reinforcement in pultrusion is ____.

A) fibrous glass
B) boron
C) graphite
D) polyester

Question 18

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

Question 19

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

Question 20

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)

Question 21

This graphic illustrates the ____ process. 

A) pultrusion
B) blown-film reinforcing
C) filament winding
D) cold stamping