5. Describe qualitatively the microstructural development that will occur upon s

Question

5. Describe qualitatively the microstructural development that will occur upon slow cooling from of 1050 steel from 1600 °C to 20 °C.

6.

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

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

c). Even through silicon is abundant on the earth. What is the key reason that silicon wafers are so expensive?

d). Based on the semiconductor introduction video, if the thickness of a semiconductor wafer is ___ _ floor height, the Integrated Circuits are build on the top ____ floor(s).

7.

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

b). Give an example of engineering application (not household items), where ceramics will be good materials to choose and high alloy steel will not be a good material to choose. Explain your reasons.

c). Give an example of engineering application (not household items), where polymers will be good materials to choose and composites will not be a good material to choose. Explain your reasons.

8.

a). Among many polymer processes, which processes can be usefor thermoplastics? Can they be used to process thermosetting polymers? Explain your reasons.

b). Engineering designers select thermosetting polymers to make electrical components. Explain why not use thermoplastic polymers.

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

Explanation / Answer

ANSWERS TO QUESTION #6 ONLY (Electrical Engineering Part)

a) Just like the N-Type Semiconductors the P-type semiconductors are extrinsic semiconductors where holes are the majority carriers. As the effective mass of a hole is greater than that of the electron then the mobility of the carriers is less in the P type semiconductor.

b) Engineers want to increase the number of transistors because they want to increase the capability of a single chip thereby increasing the fan-out of the chip.

c) Although Silicon is abundantly available on earth but to make it pure we need various methodologies that makes a Silicon chip costly.

d) Video Not Available

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