© Mikell P. Groover 2013
Chapter 5 ENGINEERING MATERIALS
Multiple Choice Quiz
There are 73 correct answers in this multiple choice quiz (some questions have multiple answers
that are correct). To achieve 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. Percentage score on the quiz is based on the total number of correct answers.
5.1
Which one of the following properties do not apply to metals: (a) good thermal conductivity,
(b) high strength, (c) high electrical resistivity, and (d) high stiffness?
5.2
The predominant phase in the iron-carbon alloy system for a composition with 99% iron at
room temperature is which one of the following: (a) austenite, (b) cementite, (c) delta, (d)
ferrite, or (e) gamma?
5.3
As temperature is increased to slightly above 912C (1674F), pure iron transforms into
which one of the following phases: (a) austenite, (b) cementite, (c) delta, or (d) ferrite?
5.4
The strength and hardness of steel increases as carbon content (a) increases or (b) decreases?
5.5
Plain carbon steels are designated in the AISI code system by which one of the following: (a)
01XX, (b) 10XX, (c) 11XX, (d) 12XX, or (e) 30XX?
5.6
Which one of the following is not a common alloying ingredient in steel: (a) chromium, (b)
manganese, (c) nickel, (d) vanadium, (e) zinc?
5.7
The principal strengthening mechanism in high-strength low-alloy (HSLA) steels is which
one of the following: (a) alloying, (b) heat treatment, (c) high carbon content, (d)
precipitation hardening, or (e) work hardening?
5.8
Which of the following alloying elements are most commonly associated with stainless steel
(two best answers): (a) chromium, (b) manganese, (c) molybdenum, (d) nickel, and (e)
tungsten?
5.9
High-speed steels are used in cutting tools for machining. Which of the following alloying
elements are used in the highest proportion in high-speed steel (two best answers): (a)
carbon, (b) manganese, (c) molybdenum, (d) nickel, (e) tungsten, and (f) vanadium?
5.10 Which one of the following is the most important cast iron commercially: (a) ductile cast
iron, (b) gray cast iron, (c) malleable iron, or (d) white cast iron?
5.11 Which one of the following metals has the lowest density: (a) aluminum, (b) magnesium, (c)
manganese, (d) tin, (e) titanium, or (f) zinc?
5.12 From which of the following ores is aluminum derived: (a) alumina, (b) bauxite, (c)
cementite, (d) hematite, or (e) scheelite?
5.13 Which of the following metals is noted for its good electrical conductivity (one best answer):
(a) copper, (b) iron, (c) nickel, or (d) tungsten?
5.14 Traditional brass is an alloy of which of the following metallic elements (two correct
answers): (a) aluminum, (b) copper, (c) gold, (d) tin, and (e) zinc?
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© Mikell P. Groover 2013
5.15 Galvanized steel is steel that has been coated with which one of the following metals: (a)
aluminum, (b) chromium, (c) nickel, (d) tin, or (e) zinc?
5.16 Which one of the following metals is not one of the three metals used as the principal
constituent in superalloys: (a) cobalt, (b) chromium, (c) iron, or (d) nickel?
5.17 A ceramic material can be defined as an organic compound consisting of a metal or
semimetal and one or more nonmetals: (a) true or (b) false??
5.18 Which of the following are properties generally associated with ceramic materials (three best
answers): (a) chemical stability, (b) electrically conductive, (c) good ductility, (d) high
hardness, (e) soluble in water, and (f) thermally insulating?
5.19 The difference between traditional ceramics and new ceramics is that most traditional
ceramics are based primarily on silicates whereas the most new ceramics are based on
oxides, carbides, or nitrides: (a) true or (b) false?
5.20 Clays used in traditional ceramics are based primarily on which of the following (one best
answer): (a) aluminum oxide, (b) aluminum silicate, (c) quartz, (d) silicon carbide, or (e)
silicon oxide?
5.21 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?
5.22 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?
5.23 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?
5.24 Glass products are based primarily on which one of the following minerals: (a) alumina, (b)
corundum, (c) feldspar, (d) kaolinite, or (e) silica?
5.25 Glass ceramics are polycrystalline ceramic structures that have been transformed into a
mostly glassy state: (a) true or (b) false?
5.26 Which of the following best characterizes the structure of glass-ceramics: (a) 95%
polycrystalline, (b) 95% vitreous, or (b) 50% polycrystalline?
5.27 Properties and characteristics of 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?
5.28 Of the three polymer types, which one is the most important commercially: (a) elastomers,
(b) thermoplastics, or (c) thermosets?
5.29 Which one of the three polymer types is not a plastic: (a) elastomers, (b) thermoplastics, or
(c) thermosets?
5.30 Which one of the three polymer types does not involve cross-linking: (a) elastomers, (b)
thermoplastics, or (c) thermosets?
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students enrolled in courses for which the textbook has been adopted. Any other reproduction or translation of this work beyond that permitted
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© Mikell P. Groover 2013
5.31 Which one of the three polymer types involves the greatest amount of cross-linking: (a)
elastomers, (b) thermoplastics, or (c) thermosets?
5.32 A branched molecular structure is stronger in the solid state and more viscous in the molten
state than a linear structure for the same polymer: (a) true or (b) false?
5.33 The defining property of a thermoplastic polymer is that it can be heated from a solid state
to a viscous liquid state and then cooled back down to solid, and that this heating and
cooling cycle can be applied multiple times without degrading the polymer: (a) true or (b)
false?
5.34 Which one of the following is the chemical formula for the repeating unit in polyethylene:
(a) CH2, (b) C2H4, (c) C3H6, (d) C5H8, or (e) C8H8?
5.35 Which of the following plastics accounts for the highest volume of all plastics: (a) phenolics,
(b) polyethylene, (c) polypropylene, (d) polystyrene, or (e) polyvinylchloride?
5.36 Which of the following polymers are normally thermoplastic (three best answers): (a)
acrylics, (b) nylon, (c) phenolics, (d) polychloroprene, (e) polyethylene, (f) polyisoprene, and
(g) polyurethane?
5.37 Polystyrene is a linear polymer noted for its transparency and brittleness: (a) true or (b)
false?
5.38 Compared to thermoplastics, thermosetting polymers are characterized by which of the
following properties (four best answers): (a) cannot be remelted, (b) capable of higher
service temperatures, (c) higher modulus of elasticity, (d) less ductile, (e) lower modulus of
elasticity, and (f) more ductile?
5.39 Curing (cross-linking) of thermosetting polymers is accomplished at the fabrication plants
rather than the chemical plants that supply the starting materials: (a) true or (b) false?
5.40 Curing of elastomers is known as which one of the following terms: (a) crystallization, (b)
firing, (c) reinforcing, (d) sintering, or (e) vulcanization?
5.41 The chemical formula for polyisoprene in natural rubber is which of the following: (a) CH2,
(b) C2H4, (c) C3H6, (d) C5H8, or (e) C8H8?
5.42 The largest tonnage elastomer is which one of the following: (a) butyl rubber, (b) isoprene
rubber, (c) polybutadiene, (d) polyurethane, (e) styrene-butadiene rubber, or (f) thermoplastic
elastomers?
5.43 A composite material is a material system composed of two or more physically distinct
phases whose combination produces aggregate properties that are different from those of
its constituents: (a) true or (b) false?
5.44 The reinforcing phase is the matrix within which the secondary phase is imbedded: (a) true
or (b) false?
5.45 Which one of the following reinforcing geometries offers the greatest potential for
improving strength and stiffness in the resulting composite material: (a) continuous fibers,
(b) discontinuous fibers, (c) flakes, (d) particles, or (e) infiltrated phase?
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students enrolled in courses for which the textbook has been adopted. Any other reproduction or translation of this work beyond that permitted
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5.46 Which of the following materials are used as fibers in fiber-reinforced plastics (four best
answers): (a) aluminum oxide, (b) boron, (c) cast iron, (d) E-glass, (e) epoxy, (f) Kevlar 49,
(g) polyester, and (h) silicon?
5.47 Which of the following metals are widely used as the matrix metals in tungsten carbide and
titanium carbide cermets (two best answers): (a) aluminum, (b) chromium, (c) cobalt, (d)
lead, (e) nickel, and (f) vanadium?
5.48 Which of the following metals are used as the matrix material in fiber-reinforced metal
matrix composites (two best answers): (a) aluminum, (b) copper, (c) iron, (d) magnesium,
and (e) zinc?
5.49 Ceramic matrix composites are designed to overcome which of the following weaknesses of
ceramics (two best answers): (a) compressive strength, (b) hardness, (c) hot hardness, (d)
modulus of elasticity, (e) tensile strength, and (f) toughness?
5.50 Most plastic molding compounds include fillers and therefore can be classified as polymer
matrix composites: (a) true or (b) false?
5.51 Which one of the following polymer types are most commonly used in fiber-reinforced
polymer matrix composites: (a) elastomers, (b) thermoplastics, or (c) thermosets?
5.52 In the Boeing 787 Dreamliner, what percentage of the aircraft consists of composite
materials (two correct answers): (a) 12% by volume, (b) 20% by volume, (c) 50% by
volume, (d) 80% by volume, (e) 12% by weight, (f) 20% by weight, (g) 50% by weight, and
(h) 80% by weight?
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