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Test #1 Example Problems (Adobe pdf file):   Test 1 examples.pdf

Test #3 Example Problems:

1. Upon heating to a temperature below the eutectoid temperature, which transformation can occur in a steel

(a) martensite to pearlite (b) pearlite to martensite

(c) pearlite to spherodite (d) coarse pearlite to fine pearlite

2. Which of the following materials consists of ferrite and cementite?

(a) pearlite (b) tempered martensite (c) spherodite (d) all of the above

3. Annealing is a heat treatment procedure carried out to

(a) relieve stresses (b) decrease ductility (c) decrease toughness (d) all of the above

4. The ability of an alloy to be hardened by the formation of martensite as a result of quenching is described by

which of the following terms.

(a) hardness (b) hardenability (c) tempering (d) aging

5. The increased strength of tempered glass is a result of

(a) compressive stresses at the surface (b) tensile stresses at the surface

(c) cationic interstitials within the sample (d) all of the above

6. The linear polymer, polyethylene, with a degree of polymerization, n (n>1000), will have approximately how

carbon bonds in its backbone? The mer for polyethylene is -C2H4-

(a) n/2 (b) n (c) 2n (d) can be either a,b, or c.

7. Polymers can be strengthened by:

(a) molecular alignment (b) vulcanization (c) crystallization (d) all of the above

Problem 1:

For a randomly coiled polyethylene (C2H4) molecule of degree of polymerization 8450 and carbon-carbon bond
length 0.154 nm, calculate the end-to-end distance in nm.

(a) 20 (b)14 (c) 1301 (d) 2500

Problem 2:

Which polymer is most likely to crystallize:

(a) network phenol-formaldehyde (b) linear isotactic polyvinyl chloride

(c) heavily vulcanized polyisoprene (d) linear atactic polyvinyl chloride