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Fall 2024 Structure & Properties of Materials - MANE2220Quiz #2
1. A polycrystalline material is best defined as a material that has:
a) many grains of the same size randomly aligned
b) many grains of different sizes randomly aligned
c) many grains of the same size uniformly aligned
d) many grains of different sizes uniformly aligned
2. Dislocations tend to move along close-packed directions.
a) True
b) False
3. Atom% of an element within a 2-component alloy system is:
a) mass of one component divided by the total mass of alloy
b) atomic weight of one component divided by the total sum of atomic weight of alloy
c) number of moles of one component divided by the total number of moles in the alloy.
4. Formation of vacancies in a metal mainly depends on:
a) crystal structure
b) temperature
c) size of the atom
5. Hume-Rothery rules are related to:
a) solid solutions
b) diffusion
c) dislocations
6. Lower lattice distortion is created under self-interstitial defects.
a) True
b) False
, 7. Carbon atoms are found in between the lattice spaces of iron atoms in steel. This defect is
known as:
a) Substitutional
b) Vacancy
c) interstitial
d)dislocation
8. Is it likely for metals with different crystal structures to have complete solubility in each
other?
a) yes
b) no
9. If the atoms of two elements have radii similar to each other they will tend to have lower
solubility in each other.
a) True
b) False
10. Dislocations have minimal effects on yield strength of metals.
a) True
b) False
11. Which of the following best describes a substitutional solid solution?
a) The lattice maintains same number of atoms
b) The lattice contains extra atoms
c) The lattice has missing atoms
12. Which one of the following is not a zero-dimensional defect?
a) Vacancy defect
b) Substitution imperfection
c) Frenkel defect
d) Screw dislocation
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