Exam (elaborations)
MTL200 MATERIAL SCIENCES AND ENGINEERING QUESTIONS AND ANSWERS
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MTL200 MATERIAL SCIENCES AND ENGINEERING QUESTIONS AND ANSWERS
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Name: Score:72 Multiple choice questions
,Term 1 of 72
1. What is planar density?
2. What is the process of slip?
3. What is a close packed structure?
4. What is the stacking sequence for HCP and FCC?
5. What is a single crystal?
1. Size of the grain and determined when properties of the polycrtyalline and single
phase material are under consideration
2. Counting the number of grain boundaries intersection by straight line tests
3. Comparing grain structures with standardized charts based on grain area
4. American Society for Testing Materials
5. Chart that is matched with micrograph
1. Polymer chains form by sequential addition of monomer units
*2. The angle between CARBON atoms is 109° and the carbon-carbon bond length is
0.154nm
3. Process of forming a polymer
*4. In pvc, every 4th atom is replaced with a functional group of chlorine (check
monomer)
*1. Occurs when a wave encounters a series of regularly speeding obstacles that can
scatter waves, and have a similar magnitude; 2θ
2. One composed of a large number of scattered waves that mutually reinforce one
another
3. Waves which are in and out of phase
4. High energy and of short wavelengths
5. For determination of crystal structures
*1. Number of atoms per unit area that are entered on a particular crystallographic plane
2. Mechanism by which metals plastically deform
,*3. Maximum atom of sphere-packing density
*4. HCP = ABABABAB..... FCC = ABC ABC ABC ABC...
*5. When periodic arrangement of atoms extend throughout the entirety of the specimen
, Term 2 of 72
1. What is compositionally homogeneous?
2. What are impurity defects; name them
3. What is substitutional defect? list the rules for this to happen
1. Tool used to record images
*2. Light is used in optical and beams of electrons are used in electron (instead of
radiation of light)
3. Technique used to examine metals; Surface treatment using appropriate chemical
reagents
*4. Transmission electron microscopy (TEM) forms when electron beams pass through
specimen
Scanning electron microscope (SEM) is reflected beam of electrons when they are
collected and displayed
Scanning probe microscope: topographic map on atomic scale
1. Impurities that are random and uniformly dispersed
2. Defects found in solid solutions, substitutional and interstitial
*3. Solute/impurity replaces or substitutes the host atom (same size)
1. Must have radii difference of +/- 15%, otherwise causes distortions and new phases
2. Must have same crystal structure
3. The more electronegative/positive increases the likelihood of intermetallic bonds
4. A metal has a higher tendency to dissolve another of high valence
1. Small void space which is normally unoccupied [size difference of atoms]; usually
occurs in small concentrations - tetra/octahedral
*2. Impurities of atoms are added to intentionally impact specific characteristics of the
material; commonly used to increase mechanical strength and resist corrosion
3. Addition of impurity atoms to a metal; forms when solute atoms are added to host
material
4. Element or compound that is present in the minor amount
*5. The element or compound that is present in the greater amount - Host Atoms
*1. Linear defect around which some atoms are misaligned;
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