EET 191

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Author:
sanjer
ID:
247685
Filename:
EET 191
Updated:
2013-11-18 22:04:18
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Material Science
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Material Science
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  1. The basic structure of matter
    Atom
  2. Apoximately how many elements have been identified
    100
  3. In the periodic table elements can be divided into which categories?
    Metals, Non Metals, Semi Metals
  4. The element with the lowest density and the smallest atomic weight is?
    Helium
  5. Which of the following bonds are clasified as primary bonds?
    Covalent, ionic, and Metallic.
  6. How many atoms are in a body centered cubic unit cell.
    9
  7. How many atoms are there in a face centered unit cubic cell.
    14
  8. How many atoms are there in a hexagonal closed pack unit cubic cell.
    17
  9. Which of the following crystal structures has the fewest slip directions.
    • grain boundaries
    • interstitialcy
    • vacancy
  10. Which of the following crystal structures has the fewest slip directions and there fore metals with this structure are generally more dificult to deform at room temperature.
    HCP (hexagonal closed packed
  11. Grain boundaries are an example of which of the following Chrystal structure defects?
    Surface defects.
  12. Twining is which of the following: Elastic deformation, mechanism of plastic deformation, more likely at high deformation rates, more likely in metals with HCP structure, slip mechanism, type of mechanism.
    • Mechanism of plastic deformation
    • more likely at high deformation rates
    • more likely in metals with HCP structure
  13. Metals are characterized by which of the following bonding types?
    Metallic bonds
  14. Ceramics are characterized by which of the following bonding types?
    Ceramic bonds
  15. Polymers are characterized by which of the following bonding types?
    Covalent bonds

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