EMA Exam 3
Name 4 situations in which casting is the preferred fabrication technique. - Answer-For alloys having low
ductilities, when it is the most economical fabrication technique, for large pieces and/or complicated
shapes, & when mechanical strength is not an important consideration.
How does increasing the annealing temperature influence the rate of an annealing process? - Answer-
Increases the rate
If a ceramic piece is desired that is dense and is to experience very little or no grain growth during its
processing, what powder pressing technique should be used? - Answer-Hot pressing
Normalizing of a ferrous alloy causes the average grain size to... - Answer-Decrease
What influence does the presence of alloying elements (other than carbon) have on the shape of a
hardenability curve? - Answer-It causes a much more gradual decrease in hardness with position from
the quenched end
Why are plasticizers added to polymers? - Answer-To improve toughness & flexibility
What is the distinction between glass transition temperature and melting temperature? - Answer-Glass
transition temperature is a characteristic of a noncrystalline material and melting temperature is for a
crystalline material
Name 4 situations in which casting is the preferred fabrication technique. - Answer-For alloys having low
ductilities, when it is the most economical fabrication technique, for large pieces and/or complicated
shapes, & when mechanical strength is not an important consideration.
How does increasing the annealing temperature influence the rate of an annealing process? - Answer-
Increases the rate
If a ceramic piece is desired that is dense and is to experience very little or no grain growth during its
processing, what powder pressing technique should be used? - Answer-Hot pressing
Normalizing of a ferrous alloy causes the average grain size to... - Answer-Decrease
What influence does the presence of alloying elements (other than carbon) have on the shape of a
hardenability curve? - Answer-It causes a much more gradual decrease in hardness with position from
the quenched end
Why are plasticizers added to polymers? - Answer-To improve toughness & flexibility
What is the distinction between glass transition temperature and melting temperature? - Answer-Glass
transition temperature is a characteristic of a noncrystalline material and melting temperature is for a
crystalline material
