ENGM 445 FINAL EXAM QUESTIONS
AND ANSWERS GRADED A+ 2025/2026
Which two of the following are purposes of finishing operations such as grinding used for parts
made of the new ceramics?
apply a surface coating
electroplate the surface
improve surface finish
increase dimensional accuracy - ANS improve surface finish
increase dimensional accuracy
A roving is a collection of twisted continuous strands, whereas a yarn is an untwisted collection
of filaments. T o F - ANS False
Of the open mold processes for polymer matrix composites, hand lay-up is the least labor-
intensive. T o F - ANS False
In the hand lay-up process, a dry layer of fiber reinforcement is placed onto the mold and
impregnated by liquid uncured resin using a manual rolling technique; the process is repeated
for successive layers. T o F - ANS True
1 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
,Automated tape-laying (ATL) machines dispense a prepreg tape onto an open mold by following
a programmed series of back-and-forth passes across the mold surface until the parallel rows of
tape complete each layer. T o F - ANS True
The principal process parameters in curing (cross-linking) of the thermosets used in fiber-
reinforced polymer composites are time, temperature, and pressure. T o F - ANS True
Resin transfer molding is a closed-mold process in which a preform mat is placed in the mold
and a thermosetting resin is transferred into the cavity under moderate pressure to impregnate
the preform. T o F - ANS True
Although thermoplastic fiber-reinforced plastics can be injection molded, thermosetting FRPs
cannot be injection molded because of the risk of premature cross-linking in the injection
chamber. T o F - ANS False
Pulforming is similar to pultrusion but is capable of producing a semicircular contour with
altered cross sections at one or more locations along the length of the part. T o F - ANS True
The term prepreg stands for which one of the following? - ANS pre-impregnated fibers
An advantage of using an open mold versus a closed mold is which one of the following? -
ANS the mold costs much less than if two matching molds were used
Which two of the following products are not made by hand lay-up open-mold operations?
Boat hulls
Fishing Polls
Larger Container tanks
Swimming pools
2 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
, Tennis Rackets - ANS Fishing Polls
Tennis Rackets
In the spray-up method, liquid resin is applied on an open mold and chopped fibers are then
sprayed onto the resin to build successive FRP laminations. T o F - ANS False
An apparatus that provides control over both temperature and pressure and is used to cure
polymer matrix composites is called which one of the following? - ANS Autoclave
A molding operation that uses sheet-molding compound is a form of which one of the
following? - ANS compression molding
Filament winding involves the use of which one of the following fiber reinforcements? -
ANS continuous filaments
The special tooling in filament winding that determines the shape of the filament-wound part is
called which one of the following? - ANS mandrel
The most important rubber product is which one of the following? - ANS pneumatic tires
The name of the natural rubber sheets that have been dried in smokehouses is which one of the
following? - ANS ribbed smoked sheet
Of the following additives in rubber, which one would rank as the single most important? -
ANS carbon black
The roller die process is a combination of which two of the following processes?
3 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
AND ANSWERS GRADED A+ 2025/2026
Which two of the following are purposes of finishing operations such as grinding used for parts
made of the new ceramics?
apply a surface coating
electroplate the surface
improve surface finish
increase dimensional accuracy - ANS improve surface finish
increase dimensional accuracy
A roving is a collection of twisted continuous strands, whereas a yarn is an untwisted collection
of filaments. T o F - ANS False
Of the open mold processes for polymer matrix composites, hand lay-up is the least labor-
intensive. T o F - ANS False
In the hand lay-up process, a dry layer of fiber reinforcement is placed onto the mold and
impregnated by liquid uncured resin using a manual rolling technique; the process is repeated
for successive layers. T o F - ANS True
1 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
,Automated tape-laying (ATL) machines dispense a prepreg tape onto an open mold by following
a programmed series of back-and-forth passes across the mold surface until the parallel rows of
tape complete each layer. T o F - ANS True
The principal process parameters in curing (cross-linking) of the thermosets used in fiber-
reinforced polymer composites are time, temperature, and pressure. T o F - ANS True
Resin transfer molding is a closed-mold process in which a preform mat is placed in the mold
and a thermosetting resin is transferred into the cavity under moderate pressure to impregnate
the preform. T o F - ANS True
Although thermoplastic fiber-reinforced plastics can be injection molded, thermosetting FRPs
cannot be injection molded because of the risk of premature cross-linking in the injection
chamber. T o F - ANS False
Pulforming is similar to pultrusion but is capable of producing a semicircular contour with
altered cross sections at one or more locations along the length of the part. T o F - ANS True
The term prepreg stands for which one of the following? - ANS pre-impregnated fibers
An advantage of using an open mold versus a closed mold is which one of the following? -
ANS the mold costs much less than if two matching molds were used
Which two of the following products are not made by hand lay-up open-mold operations?
Boat hulls
Fishing Polls
Larger Container tanks
Swimming pools
2 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
, Tennis Rackets - ANS Fishing Polls
Tennis Rackets
In the spray-up method, liquid resin is applied on an open mold and chopped fibers are then
sprayed onto the resin to build successive FRP laminations. T o F - ANS False
An apparatus that provides control over both temperature and pressure and is used to cure
polymer matrix composites is called which one of the following? - ANS Autoclave
A molding operation that uses sheet-molding compound is a form of which one of the
following? - ANS compression molding
Filament winding involves the use of which one of the following fiber reinforcements? -
ANS continuous filaments
The special tooling in filament winding that determines the shape of the filament-wound part is
called which one of the following? - ANS mandrel
The most important rubber product is which one of the following? - ANS pneumatic tires
The name of the natural rubber sheets that have been dried in smokehouses is which one of the
following? - ANS ribbed smoked sheet
Of the following additives in rubber, which one would rank as the single most important? -
ANS carbon black
The roller die process is a combination of which two of the following processes?
3 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
