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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. Porcess of breaking large organic hydrocarbons into smaller molecules






2. Relative configuration of adjecent asymmetric carbons






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






4. Atoms attached to the polymer backbone.






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






6. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...






7. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






8. Number of bonds a molecule has formed






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






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






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






12. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads






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






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






15. 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






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






17. 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






18. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






19. 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






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






21. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






22. Primary raw material for most polymers






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






24. One method of expressing the molecular weight of sample of polymers with averaging based on weight; this method is more useful when large molecules in the sample dominate the behavior






25. 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






26. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.






27. Is not asymetric and cannot have multiple configurations






28. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






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






30. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants






31. Pigments or dyes that change the way light is absorbed or reflected by a polymer






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






33. 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






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






35. 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






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






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






38. 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






39. Conformation in which the largest substituents are offset by 180






40. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






41. Polymer made up of two of more differenet monomers covalently bonded together






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






44. Coloring agents that do not dissolve into the polymer






45. Covalent bonding of the polymer backbone and side groups






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






47. 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






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






49. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber






50. 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