Circle only one right answer from the four choices for the following questions.

Question

Circle only one right answer from the four choices for the following questions. Consider the total free energy change for nucleation for the case of a cubic nucleus of edge length a (instead of a sphere of radius r). Is the nucleation barrier for a cubic nucleus larger or smaller than that for a spherical nucleus? (a) larger (b) smaller (c) same (d) depends on temperature The aluminum beverage can is formed from a single sheet of an aluminum alloy. Production operations include? (a) deep drawing (b) forging (c) extrusion (d) die casting Which one of the following statements is NOT correct for the thermal processing of metals? (a) full annealing treatment is followed by slow cooling (b) normalizing can produce coarse pearlite (c) process annealing changes the microstructure of the deformed structure (d) spheroidizing treatment increases a ductility of the steel Which one of the following existing processes utilizes permanent mold? (a) sand casting (b) continuous casting (c) investment casting (d) die casting Alloying elements in steel can make. (a) decreased hardenability (b) easiness in forming martensite (c) variation of hardness from surface to center of the specimen (d) reduced hardness How many octahedral interstices arc in an FCC unit cell? (a) 4 (b)6 (c) 8 (d) 10 What kind of crystal structure would you expect for CaF_2 (ionic radius of Ca^2+ and F is 0.100 and 0.133, respectively)? (a) six anions are surrounding a cation (b) only half of the cation sites arc occupied (c) exactly the same structure as CsCl (d) exactly the same structure as NaCl Which of the following materials is NOT a ceramic? (a)GaN (b) diamond (c)BaTiO_3, (d) ZrO_2 Two HCP metals, Ti(c/a = 1.59) and Zn (c/a = 1.86) are to be cold rolled to manufacture metal sheets. Which of the two metals is easier to form a thinner sheet? (a) Ti (b) Zn (c) same (d) none of them What is the reason to make a notch on the sample for impact test? (a) to promote more plastic deformation b) to create triaxial stress state (c) to lower strain rate (d) all of the above

Explanation / Answer

5.4) a, d

Permanent mold was utilized in both sand casting and die casting.

5.5) b

5.6) a

There are 4 octahedral interstices in FCC unit cell.

5.8) a

Ceramics are inorganic materials and non-metals. Ceramics are generally thermal and electrical insulators.

Ex: Diamond, Graphite, ZrO2, BaTiO3

5.10) d

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.