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Test your basic knowledge |

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. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability






2. Carbon atom capable of multiple configurations due to four different substituents






3. 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






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






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. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






7. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret






8. Double bounded organic molecule used to begin addition polymerization






9. Softening agents






10. Atoms attached to the polymer backbone.






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






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






13. Relative configuration of adjecent asymmetric carbons






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






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






16. 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






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






18. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed






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






20. 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






21. First step in the process of polymerization - during which a free radical is formed






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






23. Primary raw material for most polymers






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






25. 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






26. 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






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






28. Porcess of breaking large organic hydrocarbons into smaller molecules






29. 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






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






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






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






33. Covalent bonding of the polymer backbone and side groups






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






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






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






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






38. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






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






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






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






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






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






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






45. Number of bonds a molecule has formed






46. Coloring agents that do not dissolve into the polymer






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






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






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






50. 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






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