Material Engineering MCQs
Material Engineering MCQs
These Material Engineering multiple-choice questions and their answers will help you strengthen your grip on the subject of Material Engineering. You can prepare for an upcoming exam or job interview with these 100+ Material Engineering MCQs.
So scroll down and start answering.
1: How is materials selection usually performed?
A. Handbooks
B. Encyclopedia
C. Materials selection charts
D. Atlas
2: In steady-state diffusion, increasing the area across which the diffusion occurs will have what effect on the concentration profile?
A. The concentration profile will have steeper slope
B. The concentration profile will be uneffected.
C. The concentration profile wil have a less steeper slope
3: After steel quenching, a tempering is usually performed. The aim of the tempering is:
A. To further increase the hardness
B. To increase the toughness
C. To further decrease the ductility
D. To further increase the stiffness
4: Given a material with yield strength 310 MPa and a factor of safety 5, what is the working stress
A. 1550 MPa
B. 305 MPa
C. 62 MPa
D. 315 MPa
5: What is the maximum carbon content of steels?
A. 2%
B. 1,50%
C. 2,50%
D. 1%
6: How can the diffusion velocity be quantified?
A. Newton's law
B. Fick's law
C. Einstein's law
D. Hooke's law
7: On tensile test,does the plane of rupture says anything about the mechanical nature of the materials?
A. Yes, if the material is brittle or ductile
B. Yes, if the material has high or low hardness
C. No, there isn’t any relation between the plane of rupture and the nature of the material
8: The aim of steel quenching is to give to the material
A. The maximum hardness
B. The lowest ductility
C. The maximum stiffness
9: How would you determine the material properties obtained from a tensile test?
A. By means of a stress-strain chart
B. By means of a stress-load chart
C. By means of a load-strain chart
10: When a metal is cooled, what happens at a microstructural level?
A. Formation of Nuclei and then the growth of nuclei but not originating crystals
B. Formation of Nuclei and then the growth of nuclei originating crystals
C. No important changes occur at the microstructural level
11: Which one of these can be considered as defects if they exist on a material
A. Dislocations but not gaps
B. Gaps and dislocations
C. Gaps but not dislocations
12: On the martensitic transformation, the ratio between the height of the tetragonal structure in relation to the other dimensions, which are equal, depend on the carbon content. True or False?
A. True
B. False
13: What are the main characteristics of metals?
A. High Young’s Modulus, high density, low toughness
B. High Young’s Modulus, low density, low toughness
C. Low Young’s Modulus, low density, low toughness
D. High Young’s Modulus, high density, high toughness
14: The eutectic alloy is the alloy with lowest melting point on an eutectic system. True or false?
A. True
B. False
15: Does the geometry have an influence on the critical failure modes that may occur on a material upon mechanical loading?
A. No, the failure modes depend only on the material
B. Yes
C. No
16: Which mechanical properties can be determined from tensile test?
A. Density, Yield strength, Melting point
B. Young’s Modulus, Yield strength, Rupture strength
C. Young’s Modulus, Density , Melting point
17: Is the material cost always the most important factor for materials selection?
A. No, not always
B. Yes, always
18: What is the phase of pure iron at room temperature?
A. austenite
B. pearlite
C. cementite
D. ferrite
19: A rod of initial length 10 cm is placed under load. The rod's new length is measured at 10.5 cm. What is the engineering strain of the material under this load?
A. 0.952
B. 0.05
C. 0.048
20: True or False: appreciable solid solubility requires that the solvent and the solute share a crystal structure.
A. False
B. True
21: Which of the following factors does not influence diffusion?
A. The temperature
B. The crystalline structure of the materials
C. The electrical conductivity of the material
D. The atomic radius of the diffusing species
22: Is it possible to determine Poisson coefficient experimentally?
A. Yes, by doing a tensile test on the elastic domain
B. No, It is not possible, but can be calculated if the longitudinal elasticity modulus and the transversal elasticity modulus are known
C. No, It is not possible
23: Why do materials get oxidated?
A. Because the reactions originating the oxidated compounds lower the energy of the system, and, this tendency depends strongly of the material
B. Because the reactions originating the oxidated compound lower the energy of the system, and, this tendency is equal for every material
C. Because the reactions originating the oxidated compound increase the energy of the system, and, therefore, the system becomes more stable
24: Which of the following is NOT a characteristic of aluminum and aluminum alloys?
A. high electrical conductivity
B. high thermal conductivity
C. high corrosion resistance
D. high melting temperature
25: What is the purpose of annealing steel?
A. To increase ductility and decrease brittleness.
B. To decrease ductility and increase brittleness.
C. To increase ductility and increase brittleness.
D. To decrease ductility and decrease brittleness.
26: In non-equilibrium cooling of a binary system, what happens to the distribution of the two elements in the final grains?
A. The elemental composition of the grains will be uniform
B. There will be a concentration gradient, with the center of the grain rich in the higher-melting element and the grain boundaries rich in the lower-melting element.
C. There will be a concentration gradient, with the center of the grain rich in the lower-melting element and the grain boundaries rich in the higher-melting element.
27: On crystalline solids, the dislocations :
A. May be formed during solidification, but also by plastic deformation
B. May be formed by plastic deformation, but not by solidification
C. May be formed during solidification, but not by plastic deformation
28: Given a <2% contentration of carbon (atomic radius 0.071 nm) in iron (atomic radius (0.124 nm), will the solid solution formed be substitutional or interstitial, or will second phase form instead?
A. a second phase will form
B. interstitial
C. substitutional
29: Consider two materials, with the exact same properties except the yield strength, which is higher in one of them. The material with higher yield strength:
A. Is better in terms of stiffness
B. Has higher Young's Modulus
C. Yields at a higher load intensity
30: Grain boundaries are defects. True or False?
A. False
B. True
31: Which of the following iron-carbon phase is formed by a diffusionless transformation?
A. bainite
B. pearlite
C. martensite
D. spheroidite
32: True or False: Hardness is an absolute material property.
A. False
B. True
33: When Luders bands occur
A. They cannot be effectively treated
B. They can be effectively treated with a procedure which eliminates free dislocations
C. They can be effectively treated with a procedure which creates free dislocations
34: What are the main characteristics of polymers?
A. Low Young’s Modulus, low density, low strength
B. Low Young’s Modulus, high density, low strength
C. High Young’s Modulus, low density, low strength
D. High Young’s Modulus, high density, high strength
35: On a steel, what is the effect of increasing the carbon content?
A. The ductility decreases, so as the elongation
B. The ductility increases but the elongation decreases
C. The ductility and the elongation increase
D. The ductility decreases, but the elongation increases
36: For tools made of steel, if the part suffers fracture, the carbon content shall:
A. Be increased
B. Be decreased
C. Be kept constant, but alloying elements shall be decreased
D. Be kept constant, but alloying elements shall be increased
37: When ceramics are sintered:
A. The structural strength increases and there is an increase in the porosity
B. The structural strength increases and density decreases
C. The structural strength increases and density is kept constant
D. Both structural strength and density increase
38: What happens when excess solute is added to a solution above the solution's solubility limit?
A. The additional solute forms a new phase.
B. The additional solute cannot be added to the solution.
C. The solution raises its the solubility limit.
D. There is no solubility limit for solutions
39: An increase in temperature will have what effect on the diffusion coefficient of a material
A. The diffusion coefficient will increase exponenetially
B. The diffusion coefficient will decrease exponentially.
C. The diffusion coefficient will decrease linearly.
D. The diffusion coefficient will increase linearly
40: For structural applications, what shall be the offset for the determination of the yield stress?
A. 0,10%
B. 0,20%
C. 0,25%
D. 0,15%
41: Which of the following metals has higher impact strength?
A. Aluminum
B. Copper
C. Zinc
D. Iron
42: When a material is plastically deformed:
A. The Hooke's law is valid to predict the mechanical behavior if the load is tensile
B. If the load is removed, all the deformation is lost
C. The dislocations move
D. The material has not suffered yield
43: Two samples of a ceramic are formed from a powdered precusor material. Subsequent to compactation and forming, sample A has 0.2 volume fraction porosity, while sample B has 0.4 volume fraction porosity. Which sample has a higher modulus of elasticity?
A. B
B. A
C. Both A and B have the same modulus of elasticity.
44: Which will have a lower surface free energy at room temperature: a solid nucleus surrounded by a liquid phase or a solid nucleus on a solid surface?
A. They both have the same surface free energy
B. a nucleus in the liquid
C. a solid nucleus on a solid surface
45: What is the Elasticity Modulus and what does it represent?
A. It represents the stiffness of the materials, and the higher the value, the more elastic and less rigid is the material
B. It represents the stiffness of the materials, and it is always valid, regardless of the considered domain
C. It represents the stiffness of the material, without accounting the geometry, on the elastic domain only
46: The Luders bands:
A. Are a characteristic of the metals with any carbon content, but that crystallize with face centered cubic (FCC) structure
B. Are a characteristic of the steels with high carbon content (>1% wt)
C. Are a characteristic of the steels with low carbon content (<0,2% wt)
47: In general, which of the following orderings best describes the typical values for linear coefficient of thermal expansion for different classes of materials?
A. metals > polymers > ceramics
B. metals > ceramics > polymers
C. ceramics > metals > polymers
D. polymers > metals > ceramics
48: In a binary isomorphous system the liquidus line separates what two phases?
A. The liquid phase and the solid phase
B. The solid phase and a phase consisting of a mixture of liquid and solid.
C. The liquid phase and a phase consisting of a mixture of liquid and solid.
49: The steels which will be plastically deformed and used to produce sheet have carbon content:
A. Between 0,25-0,55%
B. Between 0,12-0,25%
C. Lower than 0,1%
D. higher than 0,55%
50: During heat treatment, shape distortions can occur. What is a possible solution to minimize shape distortions that occur during austenitization?
A. Increase the maximum temperature and decrease the phase time during the constant temperature phase
B. Decrease the maximum temperature and phase time during the constant temperature phase
C. Decrease the maximum temperature and increase the phase time during the constant temperature phase
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Material Engineering MCQs
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