Question & Answer

What is a polymer?

There are 17 correct answers in the following multiple choice questions (some questions have multiple answers that are correct). To attain a perfect score on the quiz, all correct answers must be given. Each correct answer is worth 1 point. Each omitted answer or wrong answer reduces the score by 1 point, and each additional answer beyond the correct number of answers reduces the score by 1 point. Percentage score on the quiz is based on the total number of correct answers.

7.1 Which one of the following is the most common element in the earth's crust: (a) aluminum, (b) calcium, (c) iron, (d) oxygen, or (e) silicon?

7.2 Glass products are based primarily on which one of the following minerals: (a) alumina, (b) corundum, (c) feldspar, (d) kaolinite, or (e) silica?

7.3 Which of the following contains significant amounts of aluminum oxide (three correct answers): (a) alumina, (b) bauxite, (c) corundum, (d) feldspar, (e) kaolinite, (f) quartz, (g) sandstone, and (h) silica?

7.4 Which of the following ceramics are commonly used as abrasives in grinding wheels (two best answers): (a) aluminum oxide, (b) calcium oxide, (c) carbon monoxide, (d) silicon carbide, and (e) silicon dioxide?

7.5 Which one of the following is generally the most porous of the clay-based pottery ware: (a) china, (b) earthenware, (c) porcelain, or (d) stoneware?

7.6 Which one of the following is fired at the highest temperatures: (a) china, (b) earthenware, (c) porcelain, or (d) stoneware?

7.7 Which one of the following comes closest to expressing the chemical composition of clay: (a) Al2O3, (b) Al2(Si2O5)(OH)4, (c) 3AL2O3-2SiO2, (d) MgO, or (e) SiO2?

7.8 Glass ceramics are polycrystalline ceramic structures that have been transformed into the glassy state: (a) true or (b) false?

7.9 Which one of the following materials is closest to diamond in hardness: (a) aluminum oxide, (b) carbon dioxide, (c) cubic boron nitride, (d) silicon dioxide, or (e) tungsten carbide?

7.10 Which of the following best characterizes the structure of glass-ceramics: (a) 95% polycrystalline, (b) 95% vitreous, or (b) 50% polycrystalline?

7.11 Properties and characteristics of the glass-ceramics include which of the following (two best answers): (a) efficiency in processing, (b) electrical conductor, (c) high thermal expansion, and (d) strong, relative to other glasses?

7.12 Diamond is the hardest material known: (a) true or (b) false?

7.13 Synthetic diamonds date to (a) ancient times, (b) 1800s, (c) 1950s, or (d) 1980.

What is graphite?

What does the term devitrification mean?

What are some of the functions of the ingredients that are added to glass in addition to silica? Name at least three.

What is the primary mineral in glass products?

Define glass.

What are the elements in the ceramic material Sialon?

What is one of the important applications of titanium nitride, as mentioned in the text?

What are some of the principal applications of cemented carbides, such as WC-Co?

What does the term refractory mean?

What is glazing, as applied to ceramics?

What is clay, used in making ceramic products?

What do bauxite and corundum have in common?

What type of atomic bonding characterizes the ceramics?

What are the general physical properties of ceramic materials?

What are the general mechanical properties of ceramic materials?

What is the feature that distinguishes glass from the traditional and new ceramics?

What is the difference between the traditional ceramics and the new ceramics?

What are the four most common elements in the earth's crust?

What is a ceramic?

In the iron-iron carbide phase diagram of Figure 6.4, identify the phase or phases present at the following temperatures and nominal compositions:

(a) 650°C (1200°F) and 2% Fe3C, (b) 760°C (1400°F) and 2% Fe3C, and (c) 1095°C (2000°F) and 1% Fe3C.

For the preceding problem, use the inverse lever rule to determine the proportions of liquid and solid phases present in the alloy.

Using the lead-tin phase diagram in Figure 6.3, determine the liquid and solid phase compositions for a nominal composition of 90% Sn and 10% Pb at 204°C (400°F).

For the preceding problem, use the inverse lever rule to determine the proportions of liquid and solid phases present in the alloy.