Test
AE316 Test 1
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Preguntas del test (40)
1Tm is larger if E0 is larger
- AVerdadero
- BFalso
2The greater the electronegativity difference, the more [blank_start]ionic[blank_end] the bond
- Aionic
3The four disciplines of material science and engineering:
[blank_start]Processing[blank_end] --> [blank_start]Structure[blank_end] --> [blank_start]Properties[blank_end] --> [blank_start]Performance[blank_end]- AProcessing
- BStructure
- CProperties
- DPerformance
4APF = [blank_start]Volume of atoms in a unit cell[blank_end] / [blank_start]Volume of unit cell[blank_end]
- AVolume of atoms in a unit cell
- BNumber of atoms in a unit cell
- CVolume of unit cell
- DNumber of moles in a unit cell
5HCP and FCC have the same APF
- AVerdadero
- BFalso
6The properties of materials depend on:
- Ashape
- Bmicrostructure
- Cthe type of interatomic bonds
- Dvolume
7Electronegativity increases when moving __ in the periodic table
- Adown and left
- Bdown and right
- Cup and left
- Dup and right
8[blank_start]Ionic bond[blank_end]: giving and taking of electrons
[blank_start]Covalent bond[blank_end]: sharing of electrons
[blank_start]Metallic bond[blank_end]: creating a sea of electrons- AIonic bond
- BCovalent bond
- CMetallic bond
- DCovalent bond
- EIonic bond
- FMetallic bond
- GMetallic bond
- HIonic bond
- ICovalent bond
9The coefficient of thermal expansion is larger if the bond energy is smaller
- AVerdadero
- BFalso
10Ceramics are generally ionic bonding
- AVerdadero
- BFalso
11Van der Waals bonding is generally stronger than covalent bonding
- AVerdadero
- BFalso
12Ceramics have low resistance to fracture than metals
- AVerdadero
- BFalso
13Composites have higher tensile strength than metals
- AVerdadero
- BFalso
14Planar density = [blank_start]number of atoms on a plane[blank_end] / [blank_start]area of plane[blank_end]
- Anumber of atoms on a plane
- Bnumber of moles on a plane
- Carea of plane
- Dvolume of a plane
15[blank_start]Slip[blank_end] occurs on the plane of maximum planar density in the direction of maximum linear density
- ASlip
16For polycrystalline materials, the crystallographic grain orientation is totally random.
- AVerdadero
- BFalso
17Crystallographic/grain direction is called [blank_start]anisotropy[blank_end].
- Aanisotropy
18When the properties of a material are the same in all directions, the material is [blank_start]isotropic[blank_end].
- Aisotropic
19The number of vacancies N(v) varies with temperature
- AVerdadero
- BFalso
20Metals with substitutional atoms of another metal are called [blank_start]alloys[blank_end]
- Aalloys
21Substitutional atoms are favored among atom types
- Awith different crystal structure
- Bwith the same crystal structure
- Cwith large electronegativity difference
- Dwith small electronegativity difference
22For cubic crystals, what is the relationship between (hkl) and [hkl]?
- AThe direction is perpendicular to the plane
- BThe direction is parallel to the plane
- CThere is no relation between the direction and the plane
23An impurity atom that replaces a host atom at its lattice site is
- AAn interstitial atom
- BA substitutional atom
- CA vacancy
- DA dislocation
24Dislocations are
- Arelated to extra atoms positioned between atomic sites
- Bcaused by small atoms filling the voids of the crystal structures
- Cline defects that produce plastic deformation
- Dformed across the twin plane
25Select all true statements about grain boundaries
- Asmall grains resist plastic deformation
- Bsmall grains result in more uniform mechanical properties
- Cgrain boundaries are susceptible to etching
26Select all that are true:
- ACase hardening only hardens the surface but not the core
- BLow carbon steels are usually machined as they are easy to machine
- CCarbon diffuse into iron surface and fills vacancy of substitutional atoms
- DCarburizing is related to carbon diffusion
27Fick's first law of diffusion states that:
- AThe diffusion flux is proportional to the rate of mass transfer
- BThe diffusion flux is proportional to the concentration gradient
- CThe concentration gradient profile is linear
- DThe mass of atoms diffusing is proportional to thickness of barrier
28Diffusion is fastest for
- Aself diffusion
- Bvacancy diffusion
- Cinterstitial diffusion
- Dlow temperatures
29Atoms arranged in repetitive 3D pattern in long range order give rise to [blank_start]crystalline[blank_end] structure
- Acrystalline
- Bnon-crystalline
3090% of metals have either BCC, FCC or HCP crystal structure
- AVerdadero
- BFalso
31Coordination numbers
BCC: [blank_start]8[blank_end]
FCC: [blank_start]12[blank_end]
HCP: [blank_start]12[blank_end]- A8
- B4
- C12
- D12
- E8
- F4
- G12
- H8
- I4
32[x y z] represents a [blank_start]direction[blank_end]
(x y z) represents a [blank_start]plane[blank_end]- Adirection
- Bplane
- Cplane
- Ddirection
33When measuring grain size, n is the ASTM grain size number. If you have n<3, your material is:
- Acourse grained
- Bfine grained
34[blank_start]Atomic diffusion[blank_end]: the transport of material/matter by atomic motion
[blank_start]Vacancy diffusion[blank_end]: atoms exchange with missing atoms
[blank_start]Interstitial diffusion[blank_end]: smaller atoms diffuse between atoms- AAtomic diffusion
- BVacancy diffusion
- CInterstitial diffusion
35In steady state diffusion, how do we maximize the diffusion of atoms from one side to the other? (check all that are true)
- AMake the plate thinner
- BReduce the area across which diffusion is occurring
- CIncrease the difference of pressure/concentrations
- DGive a longer elapsed diffusion time
36Diffusion coefficient [blank_start]increases[blank_end] with increasing temperature
- Aincreases
- Bdecreases
37Diffusivity depends on: (check all that are true)
- Awhether diffusion is interstitial or substitutional
- Btemperature
- Ccrystal structure
- Dtype of crystal imperfection
- Econcentration of diffusing species
38Carbon diffusing into an iron surface and fills interstitial space to make it harder is called [blank_start]carburizing[blank_end].
- Acarburizing
39Label the picture with the light transmittence characteristic
- ATransparent
- Btranslucent
- Copaque
40The atomic weight is the weight of one atom
- AVerdadero
- BFalso
Información
- Descripción
- Engineering Test sobre AE316 Test 1, creado por Kat Ternus el 30/09/2021.
- Autor
- Kat Ternus
- Idioma
- English
- Visitas
- 5
- Etiquetas
- Valoración
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