mse midterm 2

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48 Terms

1
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which one of the materials below has the highest electrical conductivity?
gold
polyethylene
polystyrene

gold

2
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which types of materials can be reshaped by heating?
thermosets or thermoplastics

thermoplastics

3
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reducing the grain size in materials
increases/ decreases/ does not influence yield strength

increases

4
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as cold work (%CW) is increased…
tensile strength does what?

increases

5
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poisson's ratio for the majority of materials lies within the following range
from -0.25 to 0.25
from 0.25 to 0.5

from 0.25 to 0.5

6
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in the plot on the right, which materials has a higher ductility?

material 2 is more ductile than 1

<p>material 2 is more ductile than 1</p>
7
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in the plot, which material has a higher yield strength?

material 1 has a higher yield strength

<p>material 1 has a higher yield strength</p>
8
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an amorphous polymer may behave like…

first, a glass at low temperatures, then, a rubbery solid at intermediate temperatures (above
the glass transition temperature), and as a viscous liquid at high temperatures

9
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which of the following correctly represents, for an amorphous polymer, a sequential change in mechanical state with increasing in temp?
a) rubbery solid, then transition to viscous liquid, then transition to glass
b) glass, then transition to rubbery solid, then transition to viscous liquid
c) rubbery solid, then transition to glass, then to viscous liquid
d) rubbery solid, then transition to viscous liquid

b) glass, then transition to rubbery solid, then transition to viscous liquid

10
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For a given material the tensile strength is 250 MPa and a yield strength is 150 MPa. You start applying tensile stress and gradually increase this applied value. At which value of the applied stress does the onset of necking occur?

500 MPa
250 MPa
150 MPa
300 MPa

250

11
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The direction of motion of a screw dislocation's line is ____ to the direction of an applied shear stress
a) perpendicular
b) parallel
c) 45 degrees

perpendicular

12
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For a particular crystal structure, the slip plane is the plane having the
lowest or highest planar density

highest

13
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You have Metal 1 with Young's modulus E1 and metal 2 with young's mod E2 = 2 * E1. You apply the same tensile stress to both metals. Assume that your deformation is elastic. the resulting tensile strain in metal 2 is…
the same
twice as large
twice as small

twice as small than the strain in metal 1

14
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Yield strength is defined as a stress at which noticeable plastic deformation with e= 0.002 has occurred.
true
false

true

15
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Which of the following is a point defect in ceramics representing a cation vacancy-cation interstitial pair?
a) frenkel defect
b) schottky defect
c) edge dislocation
d) screw dislocation

frenkel defect

16
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Which of the following is a (are) ID defect(s)?
a) A Frenkel defect
b) A Schottky defect
c) An edge dislocation
d) A screw dislocation

edge and screw

17
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How many slip systems are there in FCC crystal structure?
3
4
12
16

12

18
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Which one of the following statements is true. Take into account that the Nitrogen is an interstitial impurity in Fe, whereas Cr is a substitutional impurity
a) diffusion coefficient for N in Fe at 750 C is higher than for Cr in Fe at 750
b) diffusion coefficient for N in Fe at 750 C is lower than for Cr in Fe at 750
c) diffusion coefficient for N in Fe at 750 C is equal to that for Cr in Fe at 750

a) diffusion coefficient for N in Fe at 750 C is higher than for Cr in Fe at 750

19
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Increasing activation energy Qd in expression for diffusion coefficient, D
increases/ decreases/ does not affect

decreases

20
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You have a material A with the tensile strength 300 MPa, a material B with the tensile strength 200 MPa, and a Material C with the tensile strength 50 MPa. Which one of these materials most likely has a highest hardness?
material A or B or C

A

21
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For a given material the tensile strength is 200 MPa, and a yield strength is 100 MPa. You need to use this material with a factor of safety 2. What would be the maximum working tensile stress you can apply to this material
400 MPa
200 MPa
100 MPa
50 MPa

50 MPa

22
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a) Draw a schematic of an engineering stress-engineering strain curves for Material A and Material B. Label both axes. You are given that Material A has a higher Young's modulus, higher tensile strength and a higher yield strength than material B. You also know that the material A is less ductile than the material B. On both curves, mark (1) tensile strength, (2) fracture point, (3) yield strength.

knowt flashcard image
23
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Which of the following is a (are) 1 D defect(s)?
a) A Frenkel defect
b) A Schottky defect
c) An edge dislocation
d) A screw dislocation

c) An edge dislocation
d) A screw dislocation

24
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How does each of the following influence the tensile modulus of a semicrystalline polymer
(a) molecular weight decrease
(b) degree of crystallinity increase
(c) deformation of drawing
(d) annealing of an undeformed material
(e) annealing of a drawn material

A) non-direct influence, increase, decrease, decrease, decrease
B) non-direct influence, increase, increase, increase, decrease
C) non-direct influence, increase, decrease, increase, decrease
D) increase, decrease, decrease, increase, decrease

B) non-direct influence, increase, increase, increase, decrease

25
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is it possible for three or more elements to form a solid solution?

yes

26
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Does the grain-size number G increases or decreases with the decrease in the grain size

increase

27
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which of the materials below has the highest electrical conductivity?
silver
silicon
polystyrene

silver

28
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Which of the materials below has the lowest electrical conductivity?
a) Polyethylene
(b) Iron
(c) Aluminum Oxide
(d) Silicon

a) Polyethylene

29
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For a screw dislocation, Burgers vector is perpendicular to the dislocation line
true or false

false

30
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For an edge dislocation, Burgers vector is perpendicular to the dislocation line
true false

true

31
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Which one of the following statements is true?

(a) Adding Ni to Cu increases its conductivity
(b) Adding Ni to Cu decreases its conductivity
(c) Adding Ni to Cu does not affect its conductivity

32
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Which types of solid solutions do you know?

substitutional and interstitial

33
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A cation vacancy-cation interstitial pair is called _ defect

frenkel

34
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A pair of cation and anion vacancies is called defect

schottky

35
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With the increase in temperature T, the vacancies concentration in metallic crystal structure
(a) increases
(b) decreases
(c) remains constant

increases

36
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With the increase in temperature T, the concentration of the Shottky defects in a ceramic material
increases/ decreases/ remains constant

increases

37
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The image on the right shows the inter-atomic force as a function of separation for two metals. Which one of the following statements is true?
(a) the atoms are more strongly bonded in metal 1 than 2
(b) the atoms are more strongly bonded in metal 2 than 1

(b) the atoms are more strongly bonded in metal 2 than 1

<p>(b) the atoms are more strongly bonded in metal 2 than 1</p>
38
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Which material from the list below has a lowest Young's modulus?
(a) Cu alloys
(b) Magnesium
(c) Graphite
(d) Polyester
(e) Carbon fibers
(f) Molybdenum

(d) Polyester

39
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The σy marked on the plot on the right is called
tensile strength
yield strength
tensile stress
toughness

yield strength

<p>yield strength</p>
40
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In the plot on the right, which material has a higher ductility?
material 1 is more ductile than 2
material 2 is more ductile than 1

material 2 is more ductile than 1

<p>material 2 is more ductile than 1</p>
41
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In the plot given, which material has a larger Young's modulus?
(a) Young's modulus of material 1 is larger than Young's modulus of material 2
(b) Young's modulus of material 2 is larger than Young's modulus of material 1

(a) Young's modulus of material 1 is larger than Young's modulus of material 2

<p>(a) Young's modulus of material 1 is larger than Young's modulus of material 2</p>
42
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In the plot provided, which material has a larger toughness?
(a) material 1 has a larger toughness
(b) material 2 has a larger toughness

(b) material 2 has a larger toughness

<p>(b) material 2 has a larger toughness</p>
43
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young's modulus is defined as
ratio of stress over strain
ratio of strain over stress
stress multiplied by strain

ratio of stress over strain

44
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what characteristic defines the resistance to permanently indenting the surface of the material?

hardness

45
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Poisson's ratio is defined as
(a)ratio of a tensile strain over a lateral strain
(b)ratio of a lateral strain over a tensile strain
(c)ratio of a tensile strain over a lateral strain multiplied by "-1"
(d)ratio of a lateral strain over a tensile strain multiplied by "-1"

(d)ratio of a lateral strain over a tensile strain multiplied by "-1"

46
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Poisson's ratio for the majority of the materials lies within the following range (choose the correct statement from the list below)
(a) from 0.25 to 0.5
(b) from 0 to 0.25
(c) from -0.1 to 0.1

(a) from 0.25 to 0.5

47
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You have a material A with the tensile strength 100 MPa, a material B with the tensile strength 200 MPa, and a material C with the tensile strength 300 MPa. Which one of these materials most likely has a highest hardness?

Material C

48
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engineering stress - strain plot

knowt flashcard image