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cap 2 materiales Flashcards

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1
Q
  1. Metals, ceramics, semiconductors, and polymers are the four major groups of which type of materials?

a. Construction materials.
b. Engineering materials.
c. Raw materials.
d. Crystalline materials.

A

b. Engineering materials.

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2
Q
  1. An example of a substitutional alloy, one where a specific atom in a metal has been replaced by another from a different element, would be:

a. plain carbon steel.
b. brass.
c. tungsten carbide.
d. silver.

A

b. brass.

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3
Q
  1. A basic property of metal that allows it to be extensively deformed under compression without fracturing at room temperature and relatively high strain rates is called:
    a. tensile strength.
    b. creep resistance.
    c. fracture toughness.
    d. malleability.
A

d. malleability.

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4
Q
  1. Large quantities of metals are used in engineering materials because of:

a. their wide variety of mechanical properties and ability to conduct electricity and heat
b. the high cost of extracting them from ore.
c. the rarity and complexity of extracting them.
d. their low fracture toughness.

A

a. their wide variety of mechanical properties and ability to conduct electricity and heal

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5
Q
  1. That type of engineering material has the ability to keep its strength at high temperature (higher than most metals and polymers), and is resistant to most chemicals because of the strength and stability of its bonds?

a. Plastics.
b. Composites.
c. Ceramics.
d. Pure alloys.

A

c. Ceramics.

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6
Q
  1. Thermistors are made from which of the following?
    a. Nano-conductors.
    b. Composites.
    c. Intrinsic semiconductors.
    d. Extrinsic semiconductors.
A

b. Composites.

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7
Q
  1. Diodes, light-emitting diodes, and transistors are
    all examples of which of the following?

a. Nano-conductors.
b. Composites.
c. Intrinsic semiconductors.
d. Extrinsic semiconductors.

A

c. Intrinsic semiconductors

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8
Q
  1. Recycling and re-melting are two of the big advantages of which type of polymer?

a. Thermoplastic.
b. Thermosetting.
c. Epoxy.
d. Covalent.

A

a. Thermoplastic.

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9
Q
  1. Examples of natural composites would include which of the following?

a. Concrete, cement, and brick.
b. Wood and granite.
c. Silk, beeswax, and bamboo.
d. Sandstone, coal, and slate.

A

b. Wood and granite.

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10
Q
  1. The properties of composites are greatly influenced by the type of matrix and:

a. the time the matrix is allowed to cure.
b. the type, shape, and size of the reinforcement materials used.
c. the color of the matrix when exposed to ultraviolet light.
d. the size of the object being manufactured.

A

b. the type, shape, and size of the reinforcement materials used.

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11
Q
  1. Despite the advances in the use of composite materials, the largest quantity of composites comprises:

a. fiberglass.
b. carbon fiber.
c. concrete.
d. plywood.

A

c. concrete.

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12
Q
  1. Nearly inert, porous growth, surface reactive, and absorbable are all examples of what broad classification of engineering materials?

a. Noble metals.
b. Biomaterials.
c. Nano-materials.
d. Bionic ceramics.

A

b. Biomaterials.

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13
Q
  1. Materials that change shape with temperature, change dimension with application of an electrical impulse, or respond to strain by producing a magnetic field are called:

a. nanocrystalline materials.
b. proprietary response materials.
c. smart materials.
d. activated materials.

A

c. smart materials.

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14
Q
  1. The number of protons in the nucleus of an atom is referred to as which of the following?

a. Neutral number.
b. Atomic or Z-number.
c. Isotope number.
d. Electron-proton number.

A

b. Atomic or Z-number.

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15
Q
  1. Regarding the elements on the periodic table, a neutral atom has:

a. the same number of protons as neutrons.
b. the same number of protons as electrons.
c. only neutrons.
d. only protons.

A

b. the same number of protons as electrons.

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16
Q
  1. Atoms of the same element that have a different number of neutrons in their nucleus are referred to as:

a. rare earth elements.
b. metalloids.
c. halogens.
d. isotopes.

A

d. isotopes.

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17
Q
  1. Ionic, covalent, and metallic bonding are all examples of what general type of chemical bonding?
    a. Strong bonds.
    b. Weak bonds.
    c. Permanent bonds.
    d. Temporary bonds.
A

a. Strong bonds.

18
Q
  1. Which type of bond is always found in compounds that contain both metallic and nonmetallic elements?
    a. Covalent.
    b. Metallic.
    c. Ionic.
    d. Dipole-dipole.
A

c. Ionic.

19
Q
  1. Two atoms that are covalently bonded will share at least:

a. two electrons.
b. one electron.
c. two protons.
d. one proton.

A

b. one electron.

20
Q
  1. The three most common lattice structures for metals include which of the following?

a. Body-centered cubic, diagonal close-packed, hexagonal open-packed.
b. Body-centered cubic, face-centered cubic, diagonal close-packed.
c. Body-centered cubic, hexagonal close-packed, diagonal close-packed.
d. Body-centered cubic, face-centered cubic, hexagonal close-packed.

A

d. Body-centered cubic, face-centered cubic, hexagonal close-packed.

21
Q
  1. Iron has a body-centered cubic structure at room temperature, but as it is heated this structure changes to:

a. hexagonal close-packed.
b. body-centered tetragonal.
c. face-centered cubic.
d. hexagonal close-packed.

A

c. face-centered cubic.

22
Q
  1. A material that has no well-defined crystalline structure is often described as in nature.
    a. ductile
    b. amorphous
    c. polymorphous
    d. triaxial
A

b. amorphous

23
Q
  1. Prior to the onset of yield, the ratio between stress (amount of force per unit area) and strain (change in length per unit length) is known as:
    a. Avogadro’s number.
    b. fatigue limit.
    c. modulus of elasticity.
    d. phase diagram.
A

c. modulus of elasticity.

24
Q
  1. If an entire piece of material is only one crystal, its properties will vary with direction. That material is said to be:

a. allotropic.
b. anisotropic.
c. isotropic.
d. plastic.

A

b. anisotropic.

25
Q
  1. If an entire piece of material is made up of small crystals that are randomly oriented and its properties are identical regardless of direction, that material is said to be:

a. allotropic.
b. anisotropic.
c. isotropic.
d. elastic.

A

c. isotropic.

26
Q
  1. Temporary deformation of a material when stress is applied, which fully reverses when stress is removed, is also known as:

a. plastic deformation.
b. elastic deformation.
c. thermal expansion.
d. viscous deformation.

A

b. elastic deformation.

27
Q
  1. Permanent deformation of a material when a stress is applied and then removed is also known as:

a. plastic deformation.
b. elastic deformation.
c. magnetic deformation.
d. piezoelectric deformation.

A

a. plastic deformation.

28
Q
  1. A(n) ________ phase .diagram graphically illustrates the relationship between temperature, composition, and the phases present in a particular alloy system.

a. crystal
b. isothermal
c. equilibrium
d. atomic bonding

A

c. equilibrium

29
Q
  1. An iron-carbon mixture with more than 2.11% carbon is commonly referred to as:

a. steel.
b. stainless steel.
c. cast iron.
d. primary iron.

A

c. cast iron.

30
Q
  1. Heating a piece of material to a specific temperature range, holding at that temperature for a period of time, and cooling it slowly at a specific cooling rate describes what metal-working process?

a. Quenching.
b. Carburizing.
c. Forging.
d. Annealing.

A

d. Annealing.

31
Q
  1. Annealing to remove strain hardening due to previous cold working and to restore ductility so that additional cold working on the product can be performed is called:
    a. full annealing.
    b. process annealing.
    c. normalizing.
    d. stress relief.
A

b. process annealing.

32
Q
  1. The technique used to provide uniformity in grain size and composition throughout the thickness of steel prior to further processing is called:

a. full annealing.
b. process annealing.
c. normalizing.
d. stress relief.

A

c. normalizing.

33
Q
  1. When some alloys are aged at room temperature or at a slightly elevated temperature, it increases the mechanical properties due to the precipitation of alloying elements. This procedure is called:

a. precipitation hardening.
b. cold hardening.
c. cold working.
d. precipitation softening.

A

a. precipitation hardening.

34
Q
  1. The degradation of a material, or deterioration of physical properties, due to a reaction with its environment describes:

a. abrasion.
b. corrosion.
c. fracture.
d. fatigue.

A

b. corrosion.

35
Q
  1. The most common type of corrosion, which is caused by a chemical or electrochemical reaction that deteriorates the entire exposed surface of
    the material, is referred to as:

a. localized corrosion.
b. pitting.
c. flow-assisted corrosion.
d. general corrosion.

A

d. general corrosion.

36
Q
  1. Corrosion that occurs under gaskets or seals, inside cracks or seams, or in spaces filled with deposits and under sludge piles is called:

a. filiform corrosion.
b. crevice corrosion.
c. galvanic corrosion.
d. erosion corrosion.

A

b. crevice corrosion.

37
Q
  1. Corrosion that occurs as a result of localized attack at or near the grain boundaries in a metal or alloy is called:
    a. crevice corrosion.
    b. general corrosión.
    c. intergranular corrosion.
    d. fretting corrosion.
A

c. intergranular corrosion.

38
Q
  1. The imperfection of crystals that are missing or have a few extra atoms is referred to as a:

a. line defect.
b. point defect.
c. line dislocation.
d. screw dislocation.

A

b. point defect.

39
Q
  1. When the crystalline lattice is deformed in a spiral form, the dislocation is called:

a. line defect.
b. point defect.
c. line dislocation.
d. screw dislocation.

A

d. screw dislocation.

40
Q
  1. When a material is “cold worked” at room temperature, causing plastic deformation, it becomes harder to deform. This process is called:
    a. cold hardening.
    b. case hardening.
    c. strain hardening.
    d. stress hardening.
A

c. strain hardening.

41
Q
  1. A material that is plastically deformed (rolled, pressed, drawn, extruded, and so on) above its recrystallization temperature is said to have been:

a. heat treated.
b. hot worked.
c. pressure treated.
d. pressure worked.

A

b. hot worked.

NDT (26 decks)

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