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Modern Material Science And Engineering 2

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. Is not asymetric and cannot have multiple configurations






2. One type of polymer that contains at least 85% of polyacrylonitrile PAN






3. 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






4. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group






5. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






6. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






7. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel






8. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






9. Two or more polymers mechanically mixed together but without covalent bonding between them






10. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






11. Atoms attached to the polymer backbone.






12. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties






13. Coloring agents that do not dissolve into the polymer






14. Low- molecular- weight building blocks repeated in the polymer chain






15. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties






16. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light






17. Primary raw material for most polymers






18. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit






19. Number of repeat/structural units in a polymer chain






20. Additives whose primary purpose is to reduce the final cost of the product






21. Arrangement of the largest substituents where the substituets are offset by 120






22. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings






23. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain






24. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water






25. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern






26. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






27. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






28. 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






29. Molecule containing a highly reactive unpaired electron






30. 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






31. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end






32. Broad category of polymers that includes polymers containing urethane linkages






33. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






34. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process






35. Covalent bonding of the polymer backbone and side groups






36. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






37. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






38. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






39. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






40. Polymer that is made up a single repeat unit






41. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






42. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






43. Conformation that occurs when the largest substituent in a molecule are offset by 60






44. Polymers that contain amide (- N-) groups in the chain






45. Porcess of breaking large organic hydrocarbons into smaller molecules






46. Covalently bonded chains of molecules with small monomer units repeated from end to end






47. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units






48. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color






49. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






50. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property