9. What is/are the purpose(s) of annealing in glass-working: (a) eliminate internal porosity, (b) soften the glass, (c) remove internal stress, (d) increase transparency, (e) increase toughness, (f) enable further deformation processes.
10. Which of the following casting processes are expendable mold operations: (a) centrifugal casting, (b) die casting, (c) investment casting, (d) low pressure casting, (e) sand casting, (f) shell molding, (g) slush casting, and (h) vacuum molding?
11. Which of the following are advantages of die casting over sand casting: (a) better surface finish and geometrical accuracy, (b) more complex geometries can be cast, (c) higher melting temperature metals can be cast, (d) higher production rates, (e) larger parts can be cast, and (f) mold can be reused?
12. Which of the following defects in casting is more unique to sand casting: (a) misrun, (b) cold shut, (c) mold shift, (d) penetration, and (e) cold shot?
13. Which of the following qualifies as a precision-casting process: (a) ingot casting, (b) investment casting, (c) plaster-mold casting, (d) sand casting, and (e) shell molding?
14. What are contributing to the shrinkage of the material in metal sand casting processes: (a) cooling, (b) sand mold collapsing, (c) solidification, (d) gravity, (e) improper mold design.