EGR 250 Exam 1

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OUTOFCHILLPILLZ
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283041
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EGR 250 Exam 1
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2014-10-22 19:25:01
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Materials Science
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Engineering 250, Material Science & Engineering
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  1. The following are the three basic components of traditional ceramics:
    A. Refractories, carbon, and silica
    B. Feldspar, silica, and leucite
    C. Mullite, silica, and leucite
    D. Silica, leucite, and sand
    C. Mullite, silica, and leucite
    (this multiple choice question has been scrambled)
  2. The atoms in the crystal structures of ceramic materials generally are bonded by the
    A. Ionic or covalent bonding
    B. Ionic or van der Waals bonding
    C. Ionic or metallic bonding
    D. Metallic and covalent bonding
    e. All of the above
    A. Ionic or covalent bonding
    (this multiple choice question has been scrambled)
  3. Traditional ceramics such as natural clays are held together by
    A. Metallic bonding
    B. van der Waals bonding
    C. Ionic bonding
    D. Covalent bonding
    B. van der Waals bonding
    (this multiple choice question has been scrambled)
  4. Which of the following has the highest propensity for glass formation?
    A. Polyethylene
    B. Fe-Si-B alloy
    C. Nitrides
    D. Aluminum alloy A356
    C. Nitrides
    (this multiple choice question has been scrambled)
  5. The following are referred to as ionic or oxide glasses
    A. Ceramic based glasses
    B. Polymer based glasses
    C. Metallic glasses
    D. Glass ceramics
    e. None of the above
    A. Ceramic based glasses
    (this multiple choice question has been scrambled)
  6. Vitrification is the
    A. Formation of a liquid glassy phase in a ceramic material that solidifies to form a vitreous matrix that bonds the unmelted particles.
    B. Formation of a polycrystalline ceramic material that solidifies to form a vitreous matrix that bonds the unmelted particles.
    C. Formation of a polycrystalline ceramic material from an inorganic glass.
    d. None of the above.
    A. Formation of a liquid glassy phase in a ceramic material that solidifies to form a vitreous matrix that bonds the unmelted particles.
    (this multiple choice question has been scrambled)
  7. The following are referred to as covalent glasses
    A. Ceramic based glasses
    B. Glass ceramics
    C. Metallic glasses
    D. Polymer-based glasses
    e. None of the above
    D. Polymer-based glasses
    (this multiple choice question has been scrambled)
  8. Which one of the following is an advanced ceramic?
    A. Zirconia
    B. Fireclay
    C. Feldspar
    D. Special refractories
    e. None of the above
    A. Zirconia
    (this multiple choice question has been scrambled)
  9. Which of the following ceramic based glasses is said to be a hard glass?
    A. Soda-lime glass
    B. Glass-ceramics
    C. Optical flint
    D. Borosilicate glasses
    D. Borosilicate glasses
    (this multiple choice question has been scrambled)
  10. Which of the following would you expect to have a better resistance to thermal shock?
    A. Both have same level of thermal shock resistance
    B. Crystalline silica
    C. Fused silica
    C. Fused silica
    (this multiple choice question has been scrambled)
  11. Devitrification is the
    A. Formation of a polycrystalline ceramic material from an inorganic glass
    B. Formation of a polycrystalline material that solidifies to form a vitreous matrix that bonds the unmelted particles.
    C. Formation of a liquid glassy phase in a ceramic material that solidifies to form a vitreous matrix that bonds the unmelted particles.
    d. None of the above.
    A. Formation of a polycrystalline ceramic material from an inorganic glass
    (this multiple choice question has been scrambled)
  12. Which of the following classification of engineering materials is on the basis of stability to the surrounding environment?
    A. Smart material, piezoelectric ceramics, shape-memory materials
    B. Biomaterials, aerospace materials, electronic materials
    C. Magnetic materials, light metals, high-strength alloys
    D. Heat treatable, non-heat treatable alloys
    E. Corrosion resistant alloys, refractory metals, wear-resistance alloys
    f. None of the above
    E. Corrosion resistant alloys, refractory metals, wear-resistance alloys
    (this multiple choice question has been scrambled)
  13. Which of the following classification of engineering materials is on the basis of characteristic length scale?
    a. Magnetic materials, light metals, high-strength alloys
    b. Biomaterials, aerospace materials, electronic materials
    c. Heat treatable, non-heat treatable alloys
    d. Corrosion resistant alloys, refractory metals, wear-resistance alloys
    e. Smart material, piezoelectric ceramics, shape-memory materials
    f. None of the above
    f. None of the above
  14. Which of the following classification of engineering materials is on the basis of response to external stimuli?
    A. Refractory metals, light metals, high-strength alloys
    B. Heat treatable, non-heat treatable alloys
    C. Smart or shape-memory material, piezoelectric ceramics
    D. Biomaterials, aerospace materials, electronic materials
    E. Corrosion resistant alloys, refractory metals, wear-resistance alloys
    f. None of the above
    C. Smart or shape-memory material, piezoelectric ceramics
    (this multiple choice question has been scrambled)
  15. Identify the following types of copolymer sequencing arrangements. left to right

    1. ABABABABABAB           2. AAABBBABBAAB


    3. AAAAAAAAAAAA           4. AAAAAABBBBBB
           B
           B
           B
    Alternating, Random, Graft, Block
  16. Which of the copolymer sequencing arrangements normally result in amorphous polymers?

    1. ABABABABABAB           2. AAABBBABBAAB


    3. AAAAAAAAAAAA           4. AAAAAABBBBBB
           B
           B
           B
    2 and 3
  17. Which of the copolymer sequencing arrangements normally result in high strength, chemically resistant polymers?

    1. ABABABABABAB           2. AAABBBABBAAB


    3. AAAAAAAAAAAA           4. AAAAAABBBBBB
           B
           B
           B
    1 and 4
  18. Which of the following classification of engineering materials is on the basis of properties?
    A. Corrosion resistant alloys, refractory metals, wear-resistance alloys
    B. Biomaterials, aerospace materials, electronic materials
    C. Smart or shape-memory material, piezoelectric ceramics
    D. Refractory metals, light metals, high-strength alloys
    E. Heat treatable, non-heat treatable alloys
    f. None of the above
    D. Refractory metals, light metals, high-strength alloys
    (this multiple choice question has been scrambled)
  19. Which of the following metallic elements is the most abundant on the earth?
    A. Copper
    B. Aluminum
    C. Iron
    D. Silicon
    e. None of the above
    B. Aluminum
    (this multiple choice question has been scrambled)
  20. Select a material that serves as an electrical insulator, in a high temp environment.
    A. Ceramic
    B. Polymer
    C. Semiconductor
    D. Metal
    e. None of the above
    A. Ceramic
    (this multiple choice question has been scrambled)
  21. An age hardening alloy is
    A. A non-heat treatable alloy
    B. A heat treatable alloy
    C. A cast iron
    d. All of the above
    e. None of the above
    B. A heat treatable alloy
    (this multiple choice question has been scrambled)
  22. Which of these alloys are used for service temperatures in the range of 500 to 1000 degrees celcius?
    A. Stainless steels
    B. Refractory alloys
    C. Lead and its alloys
    D. Aluminum and copper alloys
    E. Cast irons
    f. None of the above
    B. Refractory alloys
    (this multiple choice question has been scrambled)
  23. The wing of an aircraft made out of a metal is an example of a
    a. Cast product
    b. Wrought product
    b. Wrought product
  24. An automotive engine block is an example of a
    a. Cast product
    b. Wrought product
    a. Cast product
  25. Which one of the following ceramics are referred to as advanced ceramics:
    a. Flint
    b. Aluminum oxide
    c. Silicon nitride
    d. Mullite
    e. Sialon
    f. None of the above
    • b. Aluminum oxide
    • c. Silicon nitride
    • e. Sialon
  26. When a glass is heated and a crystalline phase precipitates,
    a. The material has vitrified
    b. The material has devitrified
    c. None of the above
    b. The material has devitrified
  27. When a by-product is produced as a result of polymerization, we expect to have polymerization occurring by which of the following mechanisms?
    a. Addition polymerization
    b. Condensation polymerization
    c. None of the above
    b. Condensation polymerization
  28. An unsaturated bond is:
    A. Required for the addition polymerization mechanism
    B. Required to provide the by-product that forms during condensation reactions.
    C. Necessary to bond the carbon atoms within the polymer chains.
    D. A bond that has been fired to drive off absorbed water.
    e. None of the above.
    A. Required for the addition polymerization mechanism
    (this multiple choice question has been scrambled)
  29. A copolymer is a mixture consisting of macromolecules of
    a. The same type of mers
    b. Different types of mers
    c. None of the above
    b. Different types of mers
  30. What does PTFE stand for?
    • polytetrafluoroethylene
    • CF2CF2
  31. As the temperature of an amorphous thermoplastic polymer is gradually reduced, the glass transition temperature is indicated when
    a. The polymer transforms into a crystalline structure.
    b. The coefficient of thermal expansion increases markedly.
    c. The slope of specific volume versus temperature changes markedly.
    d. The polymer becomes stiff, strong, and elastic.
    e. The polymer solidifies from the molten state.
    f. None of the above.
    • c. The slope of specific volume versus temperature changes markedly.
    • d. The polymer becomes stiff, strong, and elastic.
  32. Degree of Polymerization is which one of the following?
    A. Average number of mers in the molecule chain.
    B. Sum of the molecule weights of the mers in the molecule.
    C. Proportion of the monomer that has been polymerized.
    d. None of the above.
    A. Average number of mers in the molecule chain.
    (this multiple choice question has been scrambled)
  33. The usual cross-linking agent for elastomers is
    A. Nitrogen
    B. Formaldehyde
    C. Oxygen
    D. Sulfur
    D. Sulfur
    (this multiple choice question has been scrambled)
  34. Crystallization of a thermoplastic polymer is more likely when the degree of polymerization is
    A. 10000
    B. Independent of degree of polymerization
    C. 2000
    d. None of the above
    C. 2000
    (this multiple choice question has been scrambled)
  35. Crystallization of a thermoplastic polymer is more likely when the liquid polymer is cooled at
    A. 100 degree pre minute
    B. 1 degree per minute
    C. Independent
    d. None of the above
    B. 1 degree per minute
    (this multiple choice question has been scrambled)
  36. Crystallinity in polymers will be encouraged if
    A. The degree of polymerization is large.
    B. The liquid polymer is rapidly cooled to room temp.
    C. The amporphous polymer is plastically deformed between the glass transition temperature and the melting temp.
    D. The monomers the produce the chain are complex.
    C. The amporphous polymer is plastically deformed between the glass transition temperature and the melting temp.
    (this multiple choice question has been scrambled)
  37. The basic difference between low-density and high density polyethylene is that the latter has a much higher degree of crystallinity.
    a. True.
    b. False.
    a. True.
  38. Which polymer property is best correlated by the number average molecular weight?
    A. Density
    B. Viscosity
    C. Tensile strength
    d. None of the above
    C. Tensile strength
    (this multiple choice question has been scrambled)
  39. Geometric isomers are
    A. Monomers that have the same structures even though they have different composition.
    B. Copolymers that have the same composition and structures.
    C. Monomers that have different structures even though they have the same composition.
    d. None of the above.
    C. Monomers that have different structures even though they have the same composition.
    (this multiple choice question has been scrambled)
  40. combination of :
    multiple of the same monomers, two or more polymers, three monomers
    • homopolymer
    • copolymer
    • terpolymer
  41. ABS
    acrylonitrile-butadiene-styrene
  42. SBR
    styrene-butadiene rubber
  43. NBR
    nitrile butadiene rubber

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