55) If you are using an amorphous thermoplastic, what physical characteristic wo

Question

55) If you are using an amorphous thermoplastic, what physical characteristic would best help you set the ceiling continuous use temperature (the max temperature at which the polymer can be used)?

a) the melt temperature (Tm)

b) the boiling temperature (Tb)

c) the glass transition temperature (Tg)

d) the decomposition temperature (Td)

.

56) Why must aluminum-copper alloy rivets "ice box rivet" be stored in the freezer prior to use?

a) because the alloy melts at room temperature

b) because the alloy softens with aging due to normalization

c) because the alloy age hardens through precipitation at room temperature

d) because they will expand and give better fit when placed cold.

.

57) I need to build a device that is an electrical insulator, with low thermal expansion coefficient and a use temperature up to 2000 °C. Which of the following materials should I use?

a) copper

b) platinum

c) Vycor (borosilicate glass)

d) silicon carbide

Please answer all of them without guessing!!! Thanks

Explanation / Answer

55. c

56. b

57. d

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