SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
Test your basic knowledge |
Modern Material Science And Engineering 2
Start Test
Study First
Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
rayon
primary bonding
eclipsed conformation/ cis - conformation
2. Polymer made up of two of more differenet monomers covalently bonded together
plasticizers
secondary bonding
copolymer
any carbon with double bonds or repeated substituents
3. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
side groups/ substituents
cracking
freeze line
number average molecular weight Mn
4. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
polyurethanes
staggered conformation
thermoplastics
5. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
eclipsed conformation/ cis - conformation
extruder
functionality
6. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
polymers
plyacrylonitrile PAN
additives
hopper
7. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
structural unit
primary bonding
elastomers
thermosets
8. Covalent bonding of the polymer backbone and side groups
vulcanization
primary bonding
any carbon with double bonds or repeated substituents
screen pack
9. Simple polymeric material produced as pellets in large quantities
any carbon with double bonds or repeated substituents
screen pack
polyviyl chloride PVC
High volume thermoplastics HVTP
10. Broad category of polymers that includes polymers containing urethane linkages
mutual termination
structural unit
plyacrylonitrile PAN
polyurethanes
11. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
isotactic dan
asymetric
spinneret
12. Pigments or dyes that change the way light is absorbed or reflected by a polymer
quenching
coloring agents
acrylic
hopper
13. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
tacticity
die
random copolymers
copolymer
14. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
initiation
eclipsed conformation/ cis - conformation
vulcanization
coloring agents
15. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
random copolymers
isotactic dan
aramid
screen pack
16. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
staggered conformation
step- growth/condensation polymerization
plyacrylonitrile PAN
17. First step in the process of polymerization - during which a free radical is formed
shot size
alternating copolymers
initiation
structural unit
18. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
initiation
melt spinning
termination
19. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
random copolymers
plasticizers
trans - conformation
20. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
homopolymer
injection molding
block copolymers
21. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube
most common condensation/step- growth polymerization occur between....
branching
die
melt spinning
22. Two or more polymers mechanically mixed together but without covalent bonding between them
plasticizers
extruder
blends
polymers
23. Molecule containing a highly reactive unpaired electron
screen pack
staggered conformation
free radical
poly- p- phenylene benzobisoxazole PBO
24. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
primary termination
High volume thermoplastics HVTP
alternating copolymers
polypphenylene terephyhalamide PPTA
25. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow
solution spinning
functional groups
plasticizers
step- growth/condensation polymerization
26. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
melt spinning
injection molding
branching
step- growth/condensation polymerization
27. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
relative molecular mass RMM
viscose process
injection molding
rayon
28. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process
polymers
poly- p- phenylene benzobisoxazole PBO
thermoplastics
mutual termination
29. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
vulcanization
plyacrylonitrile PAN
most common condensation/step- growth polymerization occur between....
secondary bonding
30. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight
staggered conformation
weight average molecular weight Mw
relative molecular mass RMM
viscose process
31. Polymers that contain amide (- N-) groups in the chain
blends
plasticizers
additives
polyamides
32. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret
most common condensation/step- growth polymerization occur between....
cracking
melt spinning
solution spinning
33. Is not asymetric and cannot have multiple configurations
branching
weight average molecular weight Mw
any carbon with double bonds or repeated substituents
monomers
34. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
quenching
branching
staggered conformation
nylon
35. Softening agents
plasticizers
graft copolymers
free radical
alternating copolymers
36. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
cracking
polymethylmethacrylate PMMA
graft copolymers
tacticity
37. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
constitution
functional groups
primary termination
38. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
dyes
polymethylmethacrylate PMMA
constitution
eclipsed conformation/ cis - conformation
39. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density
configuration
staggered conformation
polymethylmethacrylate PMMA
branching
40. Conformation in which the largest substituents are offset by 180
trans - conformation
quenching
solution spinning
viscose process
41. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water
configuration
dyes
step- growth/condensation polymerization
conformation
42. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
additives
polymethylmethacrylate PMMA
step- growth/condensation polymerization
polyviyl chloride PVC
43. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible
glass transition temperature Tg
functional groups
any carbon with double bonds or repeated substituents
elastomers
44. Number of bonds a molecule has formed
functionality
petroleum
block copolymers
random copolymers
45. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
copolymer
rayon
aramid
46. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
polyurethanes
melt spinning
eclipsed conformation/ cis - conformation
configuration
47. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
pigments
additives
configuration
poly- p- phenylene benzobisoxazole PBO
48. Polymer that is made up a single repeat unit
dyes
homopolymer
quenching
plasticizers
49. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA
plasticizers
block copolymers
vulcanization
shot size
50. An acid and an alcohol
primary termination
injection molding
weight average molecular weight Mw
most common condensation/step- growth polymerization occur between....