Testing of Materials Solved MCQs

Multiple Choice Questions 39 Pages

Anna University

Mechanical Engineering

Contributed by

Arvind Ramson

OML751 L T P C 3 0 0 3

TESTING OF MATERIALS

OBJECTIVES
 To understand the various destructive and non destructive testing
methods of materials and its industrial applications.

UNIT I INTRODUCTION TO MATERIALS TESTING 9
Overview of materials, Classification of material testing, Purpose of testing,
Selection of material, Development of testing, Testing organizations and its
committee, Testing standards, Result Analysis, Advantages of testing.

UNIT II MECHANICAL TESTING 9
Introduction to mechanical testing, Hardness test (Vickers, Brinell, Rockwell),
Tensile test, Impact test (Izod, Charpy) - Principles, Techniques, Methods,
Advantages and Limitations, Applications. Bend test, Shear test, Creep and
Fatigue test - Principles, Techniques, Methods, Advantages and Limitations,
Applications.

UNIT III NON DESTRUCTIVE TESTING 9
Visual inspection, Liquid penetrant test, Magnetic particle test, Thermography
test – Principles, Techniques, Advantages and Limitations, Applications.
Radiographic test, Eddy current test, Ultrasonic test, Acoustic emission-
Principles, Techniques, Methods, Advantages and Limitations, Applications.

UNIT IV MATERIAL CHARACTERIZATION TESTING 9
Macroscopic and Microscopic observations, Optical and Electron microscopy
(SEM and TEM) - Principles, Types, Advantages and Limitations, Applications.
Diffraction techniques, Spectroscopic Techniques, Electrical and Magnetic
Techniques- Principles, Types, Advantages and Limitations, Applications.

UNIT V OTHER TESTING 9
Thermal Testing: Differential scanning calorimetry, Differential thermal
analysis. Thermo-mechanical and Dynamic mechanical analysis: Principles,
Advantages, Applications. Chemical Testing: X-Ray Fluorescence, Elemental
Analysis by Inductively Coupled Plasma-Optical Emission Spectroscopy and
Plasma-Mass Spectrometry.

TOTAL : 45 PERIODS

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OBJECTIVE TYPE QUESTIONS
1. The ability of a material to undergo plastic deformation without fracture
when subjected to uniaxial tensile force is ___
a) Ductility
b) Malleability
c) Tensile Strength
d) Yield Strength
2. Which metal has the highest ductility?
a) Silver
b) Gold
c) Platinum
d) Aluminium
3. Ductility of ceramics is ___
a) Less than 1%
b) 2 – 4%
c) 4 – 40%
d) More than 40%
4. What is the ductility of annealed Cu?
a) 25%
b) 35%
c) 40%
d) 45%
5. What is the ductility of commercial pure Titanium?
a) 10%
b) 14%
c) 16%
d) 25%
6. Which factor increases ductility?
a) Cold working
b) Annealing
c) Alloying
d) Inclusions
7. Which crystal structure materials possess the best ductility properties?
a) FCC
b) HCP
c) BCC
d) SC
8. Which factor decreases the ductility of materials?
a) Annealing
b) Spheroidization
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c) Grain refinement
d) Alloying
9. Cast materials show better ductility than wrought materials.
a) True
b) False
10. Neutron irradiation by neutrons can ___ yield stress and ___ ductility.
a) Increase, increase
b) Increase, decrease
c) Decrease, increase
d) Decrease, decrease
11. With the increase in the degree of stress triaxiality, ductility of material
decreases.
a) True
b) False
12. As the strain rate increases, the value of ductility ___
a) Increases
b) Decreases
c) Remains constant
d) Changes independent of strain rate.
13. Original gauge length of aluminium cylindrical spectrum is 2 inches and
fracture length is 2.78 inches. What is the ductility of specimen?
a) 38%
b) 39%
c) 40%
d) 41%
14. A cylindrical specimen having diameter of 12.8 mm is starting and 7.3 mm
at the fracture point. What is ductility?
a) 56%
b) 64%
c) 67%
d) 78%
15.The ability of a material to undergo plastic deformation without rupture,
when a compressive force is applied, is known as ______
a) Ductility
b) Formability
c) Compressive strength
d) Malleability
16. Which metal has maximum malleability?
a) Platinum
b) Gold
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c) Silver
d) Aluminium
17. Which metal shows good malleability but poor ductility?
a) Silver
b) Gold
c) Lead
d) Aluminium
18. With an increase in temperature, malleability of material ______
a) Increases
b) Decreases
c) Remains constant
d) Varies independent of temperature
19. Malleability is the property of a material to be formed into ______
a) Wires
b) Sheets
c) Bars
d) Billets
20. Malleable iron is made by heating white iron between _____ for a long time
period.
a) 200-300°C
b) 400-500°C
c) 800-900°C
d) 1100-1200°C
21. Malleable cast iron consists of _____
a) Graphite flakes
b) Graphite nodules
c) Graphite clusters
d) Spheroidite
22. Crystal structure of a material is an important factor, which affects the
malleability.
a) True
b) False
23. Which statement is false regarding malleability?
a) Presence of interstitials decreases malleability
b) With an increase in temperature malleability of material decreases
c) FCC crystals generally have good malleability
d) Materials with weak metallic bond tend to have good malleability
24. Materials with stronger metallic bonds exhibit high malleability.
a) True
b) False

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25. What is the inverse of stiffness?
a) Hardness
b) Stress
c) Flexibility
d) Toughness
26. A material’s resistance to elastic deflection is known as ___
a) stiffness
b) toughness
c) hardness
d) elasticity
27. What is the SI unit of stiffness?
a) N/m
b) N/m
c) Nm
2

d) N
28. How can stiffness of material be improved?
a) By increasing the cross-sectional area
b) By decreasing the cross-sectional area
c) By increasing temperature
d) By increasing the length of spring
29. Plasticizers in polymers ___ toughness and ____ stiffness.
a) increase, increase
b) increase, decrease
c) decrease, increase
d) decrease, decrease
30. Stiffness and strength of polymer ___ with an increase in the degree of
crystallinity.
a) increases
b) decreases
c) remains constant
d) varies showing no relation to the degree of crystallinity
31. Increasing the stiffness of material diminishes its impact strength.
a) True
b) False
32. A stiff material is always of high strength.
a) True
b) False
33. Which statement is true regarding stiffer?
a) A longer spring is stiffer
b) A spring with thin wire is stiffer
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c) Copper wire spring is stiffer than steel wire spring
d) A spring with a smaller diameter of coils is stiffer
34. With an increase in temperature, elastic modulus of metals ____ and
stiffness ____
a) increases, increases
b) increases, decreases
c) decreases, increases
d) decreases, decreases
35. The property of a material which enables it to absorb energy and deform
plastically without fracture is ______
a) Stiffness
b) Toughness
c) Hardness
d) Resilience
36. What is the SI unit of tensile toughness?
a) N/m
b) in.lbf.in
-3

c) Jm
-3

d) Jm
3

37. What is fracture toughness range of ceramics?
a) 2-8 MN m
-3/2

b) 1-10 MN m
-3/2

c) 10-30 MN m
-3/2

d) 30-40 MN m
-3/2

38. What is fracture toughness of magnesia in terms of stress intensity factor?
a) 1 MPa m
1/2

b) 2 MPa m
1/2

c) 3 MPa m
1/2

d) 5 MPa m
1/2

39. Match the following.
Material
K
Ic
(MPa m
1/2
)
i) Titanium alloy
p) 3-4
ii) Aluminium
q) 0.2-1.4
iii) Concrete
r) 44-66
iv) Silicon carbide
s) 14-28
a) i-r, ii-s, iii-p, iv-q
b) i-s, ii-r, iii-q, iv-p
c) i-s, ii-r, iii-p, iv-q
d) i-r, ii-s, iii-q, iv-p
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40. The toughness of material depends on _____ and _____ of material.
a) Ductility, yield strength
b) Ductility, tensile strength
c) Stiffness, tensile strength
d) Hardness, yield strength
41. Which factor decreases toughness of material?
a) Alloying
b) Temperature
c) Grain refinement
d) Strain rate
42. What is the reason of low toughness of grey cast iron?
a) Strain rate
b) Notch effect
c) Grain size effect
d) Crystal structure
43. Which material, would you choose for high toughness property on lower
temperatures?
a) Steel
b) Aluminium
c) Zinc
d) SiC
44. Stress intensity factor is not a function of _______
a) Loading
b) Crack size
c) Volume
d) Structural geometry
45. Material has tensile strength 40 MPa and fracture strain 0.39. What will be
approximate value of toughness?
a) 10.2 MJ/m
3

b) 15.6 MJ/m
3

c) 16.7 MJ/m
3

d) 18.9 MJ/m
3

46. A material has tensile strength 210 MPa, yield strength 117 MPa and
fracture strain 0.45. What will be approximate value of toughness?
a) 54.8 MJ/m
3

b) 67.4 MJ/m
3

c) 73.6 MJ/m
3

d) 89.2 MJ/m
3

47. Cast materials are tougher than wrought materials.
a) True
b) False
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48. Which statement is false?
a) A matrix of thermoplastic provides higher toughness than thermoset in the
composite.
b) Microcracking can improve toughness in a composite
c) Tempering of martensite decreases toughness of steel
d) Copolymerization can improve the toughness of polymer
49. The toughness of the composite depends on the toughness of the matrix.
a) True
b) False
50. ______ is the resistance of a material to plastic deformation by indentation.
a) Toughness
b) Resilience
c) Hardness
d) Stiffness
51. What is SI unit of hardness?
a) kg/m
3

b) kg/m
2

c) g/m
2

d) N/m
52. The hardness of martensite ______ with an increase in carbon content.
a) Increases
b) Decreases
c) Remains constant
d) First increases and then decreases
53. _____ is the strongest bond.
a) Van der Waals bond
b) Metallic bond
c) Covalent bond
d) Hydrogen bond
54. ______ improve hardness.
a) Strain hardening
b) Plasticizers
c) Over aging
d) Tempering
55. What is the hardness of silicon carbides?
a) 5-10 HV
b) 10-14 HV
c) 15-20 HV
d) 20-30 HV
56. When hardness is measured under dynamic loading conditions, it is known
as _____ hardness.
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a) Brinell
b) Rebound
c) Knoop
d) Rockwell
57. With an increase in temperature, hardness of material _____ and ductility
______
a) Increases, increases
b) Increases, decreases
c) Decreases, increases
d) Decreases, decreases
58. Which process increases the hardness of the material?
a) Tempering
b) Annealing
c) Quenching
d) Over aging
59. Which statement is false?
a) Alloying increases hardness of the pure metal
b) Dual phase alloys are harder than single phase alloys
c) Interstitial solid solutions are harder than substitutional solid solutions
d) Heat treatment always decreases the hardness of a material
60. Which scale is not used to measure indentation hardness?
a) Rockwell
b) Bennett
c) Shore
d) Brinell
61. Cooling rate _____ with distance from the quenched end, and the hardness
_____
a) Increases, increases
b) Increases, decreases
c) Decreases, increases
d) Decreases, decreases
62. Stamping operation increases hardness.
a) True
b) False
63. Which microconstituent of Steel is hardest?
a) Spheroidite
b) Pearlite
c) Bainite
d) Martensite
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64. Coarse pearlite is harder than fine perlite for the same composition of Steel.
a) True
b) False

65.What is tensile strength of brass?
a) 550 MPa
b) 220 MPa
c) 350 MPa
d) 760 MPa
66. Match the following?
Material
Tensile strength
(in MPa)
i) Annealed silver
p) 15
ii) Rubber
q) 33
iii) Brass
r) 170
iv) Glass
s) 550
a) i-q, ii-p, iii-r, iv-s
b) i-r, ii-p, iii-s, iv-q
c) i-p, ii-r, iii-q, iv-s
d) i-r, ii-p, iii-q, iv-s
67. Which one of the following, is not a unit of ultimate tensile strength?
a) MPa
b) N/m
2

c) Kg/m
3

d) psi
68. The ability of the material to withstand tensile force, without breaking, is
known as ______
a) Yield strength
b) Tensile strength
c) Compressive strength
d) Creep strength
69. With an increase in the degree of cold working, tensile strength of material
______
a) Increases
b) Decreases
c) Remains constant
d) First decreases then increase
70. Which one of the following factor decreases the tensile strength?
a) Cold working
b) Alloying
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Testing of Materials Solved MCQs

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