5.Describe qualitativelythemicrostructural development that will occur upon slow cooling fromof 1050 steel from 1600 °C to 20 °C.

6.

a). What are p-typesemiconductors? What are their differences comparing with n-typesemiconductors?

b).Moore’s law predicts the rapid and steady growth in the number oftransistors contained on a single microcircuit chip. Why doengineers want to increase the number of transistors contained on asingle microcircuit chip?

c). Eventhrough silicon is abundant on the earth. What is the key reasonthat silicon wafers are so expensive?

d). Based on the semiconductorintroduction video, if the thickness of a semiconductor wafer is___ _ floor height, the Integrated Circuits are buildon thetop ____ floor(s).

7.

a). Among multiple components ofa composite material, at least two components have to serve forspecific functions. What are these two components? What are thesetwo specific function?

b). Give an example ofengineering application (nothousehold items), where ceramics will be goodmaterials to choose and high alloy steel will not be a goodmaterial to choose. Explain yourreasons.

c). Give an example ofengineering application (nothousehold items), where polymers will be goodmaterials to choose and composites will not be a good material tochoose. Explain yourreasons.

8.

a). Among many polymerprocesses, which processes can be usefor thermoplastics? Canthey be used to process thermosetting polymers? Explain yourreasons.

b).Engineering designers select thermosetting polymers to makeelectrical components. Explain why not use thermoplasticpolymers.

c). PVCpopes are widely used in commercial and residential construction,what does PVC stands for?