Materials Science and Engineering

Question 1

1. The maximum stress to which a material may be subjected before failure occurs:

a. resilience
b. ultimate stress
c. endurance limit
d. tensile stress

Answer 1

b.

Question 2

2. Poisson’s ratio is the ratio of:

a. elastic limit to yield strength
b. lateral deformation to longitudinal deformation
c. shear strain to unit strength
d. elastic limit to shear strength

Answer 2

b.

Question 3

3. A substance with metallic properties, composed of two or more elements of which at least one is a metal.

a. alloy
b. mixture
c. fusion
d. metal

Answer 3

a.

Question 4

4. A type of destructive test in which the specimen, supported at both ends as a simple beam, is broken by the impact of a falling pendulum.

a. Izod Test
b. Charpy Test
c. Tensile Test
d. Hardness Test

Answer 4

b.

Question 5

5. A type of destructive test in which the specimen, supported at both ends as a cantilever, is broken by the impact of a falling pendulum.

a. Izod Test
b. Charpy Test
c. Tensile Test
d. Hardness Test

Answer 5

a.

Question 6

6. It is the process of deforming a metal physically at temperature below the recrystallization temperature and at a rate to produce strain hardening.

a. Tempering
b. Hot Working
c. Cold Working
d. Extrusion

Answer 6

c.

Question 7

7. It is the loss of carbon from the surface of steel, occurring during rolling, forging and heat treating, when the surrounding medium reacts with the carbon.

a. Decarburization
b. Decarbonization
c. Relaxation
d. Precipitation

Answer 7

a.

Question 8

8. Is a mechanical property that permits permanent deformation before fracture. It is also referred as the tendency to fracture with appreciable deformation.

a. Ductility
b. Brittleness
c. Toughness
d. Hardness

Answer 8

a.

Question 9

9. Which of the following ARE indices for measuring ductility:
   A - Percent Elongation
   B - Percent Clearance
   C - Percent Reduction in Area
   D - Percent Reduction in Volume

a. Both A and B
b. Both A and C
c. Both C and D
d. A, C and D

Answer 9

b.

Question 10

10. The ability of a material to be deformed and to return to its original shape.

a. Elasticity
b. Plasticity
c. Toughness
d. Resilience

Answer 10

a.

Question 11

11. It involves the loss of ductility because of physical or chemical change of the material.

a. Porosity
b. Embrittlement
c. Inductility
d. Malleability

Answer 11

b.

Question 12

12. It is the part of the carbon content of steel or iron that is in the form of graphite or temper carbon.

a. Free Carbon
b. Reserve Carbon
c. Diamond
d. Working Carbon

Answer 12

a.

Question 13

13. These are materials with the same properties in all direction.

a. allotropy
b. anisotropy
c. isotropy
d. azeotropy

Answer 13

c.

Question 14

14. An indefinite property that refers to the ease with which materials can be cut.

a. Rigidity
b. Ductility
c. Malleability
d. Machinability

Answer 14

d.

Question 15

15. It is a mechanical property which indicates
    material’s susceptibility to extreme deformation to rolling or hammering.

a. Resilience
b. Ductility
c. Toughness
d. Malleability

Answer 15

d.

Question 16

16. The smallest area at the point of rupture of a tensile specimen divided by the original area.

a. Percent Elongation
b. Percent Reduction in Area
c. Percent Reduction in Volume
d. Percent Deformation

Answer 16

b.

Question 17

17. The ability of metal to be deformed considerably without rupture.

a. Elasticity
b. Plasticity
c. Rigidity
d. Malleability

Answer 17

b.

Question 18

18. The process of aging a body (metal) at an elevated temperature.

a. Tempering
b. Natural Aging
c. Artificial Aging
d. Annealing

Answer 18

c.

Question 19

19. Associated with creep, this process is marked by decreasing stress at a constant strain.

a. Relaxation
b. Yielding
c. Plastic Deformation
d. Damping

Answer 19

a.

Question 20

20. The process of increasing hardness and strength by plastic deformation at temperature lower than recrystallization range.

a. Strain Hardening
b. Tempering
c. Normalizing
d. Annealing

Answer 20

a.

Question 21

21. The capacity of a material to withstand a shock load without breaking.

a. Impact Strength`
b. Toughness
c. Resilience
d. Hardness

Answer 21

b.

Question 22

22. A steel that has been deoxidized with a strong deoxidizing agent, such as aluminum or silicon, in order to eliminate reaction carbon and oxygen during solidification.

a. Rimmed Steel
b. Killed Steel
c. Wrought Steel
d. Carburized Steel

Answer 22

b.

Question 23

23. An incompletely deoxidized steel.

a. Rimmed Steel
b. Killed Steel
c. Wrought Steel
d. Carburized Steel

Answer 23

a.

Question 24

24. A steel that has been hammered, rolled, or drawn in the process of manufacture; it may be plain carbon or alloy steel.

a. Rimmed Steel
b. Killed Steel
c. Wrought Steel
d. Carburized Steel

Answer 24

c.

Question 25

25. The operation or combination of operation involving heating and cooling of metals or alloys in the solid state for the purpose of altering the properties of the material. a. Case hardening b. Age hardening c. Heat Treatment d. Oxidation Reaction

Answer 25

c.

Question 26

26. ASTM stands for: a. American Society for Tests and Methods b. American Society for Test and Measures c. American Society for Testing and Materials d. Association of Societies for Tests and Measures

Answer 26

c.

Question 27

27. Heating and slow cooling of a solid metal to alter physical and mechanical properties, producing particular microstructure, removing internal stresses and removing gases. a. Annealing b. Quenching c. Normalizing d. Tempering

Answer 27

a.

Question 28

28. Together with annealing, it causes the combined carbon to transform wholly or in part into graphitic or free carbon. a. Spheroidizing b. Graphitizing c. Carbonation d. Precipitation

Answer 28

b.

Question 29

29. The process of heating an iron-based alloy to some 100°F above the transformation range with subsequent cooling to below that range in still air at room temperature in order to produce a uniform structure. a. Annealing b. Normalizing c. Spheroidizing d. Tempering

Answer 29

b.

Question 30

30. Any heating or cooling process of steel that produces a rounded globular form of carbide. a. Malleablizing b. Graphitizing c. Drawing d. Spheroidizing

Answer 30

d.

Question 31

31. Heating of metal body to sustainable temperature just below the transformation range for steel and holding it at that temperature for a suitable for reducing the internal residual stresses. a. Normalizing b. Stress Relieving c. Relaxation d. Annealing

Answer 31

b.

Question 32

32. The process of reheating hardened or normalized steel to temperature below the transformation range, followed by any desired rate of cooling. a. Tempering b. Annealing c. Quenching d. Normalizing

Answer 32

a.

Question 33

33. A measure of a material’s resistance to indentation. a. Toughness b. Resilience c. Hardness d. Brittleness

Answer 33

c.

Question 34

34. The following test are used to measure hardness except: a. None of the choices b. Rockwell c. Brinell d. Vicker

Answer 34

a.

Question 35

35. The capacity of steel to through-harden when cooled from above its transformation range. a. Hardenability b. Conductivity c. Relativity d. Porosity

Answer 35

a.

Question 36

36. The process of adding carbon to the surface of steel by exposing it to hot carbonaceous solids, liquids or gases - above the transformation temperature. a. Carbonating b. Carburizing c. Case Hardening d. Induction Hardening

Answer 36

b.

Question 37

37. It is the temperature interval during which austenite is formed during heating. a. Transformation Range b. Cooling Range c. Approach Range d. Theoretical Range

Answer 37

a.

Question 38

38. A mechanism which usually do the indexing in a machine tool: a. universal chuck b. slotter c. dividing head d. indexing

Answer 38

c.

Question 39

39. Which of the following is not a structural class of steel? a. low carbon steel b. tool and die steel c. high chrome alloy steel d. high strength low alloy steel

Answer 39

b.

Question 40

40. All are associated with the grade of steel except: a. SAE43XX b. SAE13XX c. SAE10XX d. SAE74XX

Answer 40

d.

Question 41

41. Recommend best cutting angle of drill for work on steel or cast iron is __ degrees. a. 48 b. 63 c. 59 d. 50

Answer 41

c.

Question 42

42. The property that characterizes a material ability to be drawn into a wire: a. ductility b. thermal conductivity c. tensile strength d. endurance limit

Answer 42

a.

Question 43

43. What is the common shop practice to prevent solder from running away from surface to be joined?: a. all of these b. surround the work with clay c. introduce around the work rolled wet cloth d. put asbestos sheeting around the work

Answer 43

a.

Question 44

44. Non-ferrous filler metal is melted into grooves ar as fillet on the mother metal; the base metal is not melted. this is commonly used for joining iron based machine parts or in repair works of some materials. It is called: a. spot welding b. braze welding c. brazing d. gas welding

Answer 44

a.

Question 45

45. Normal stress relieving temperature for cast steel: a. 200 to 350ºF b. 400 to 500ºF c. 300 to 400ºF d. 450 to 550ºF

Answer 45

d.

Question 46

46. Most effective alloying element for reducing brittleness of steel at very low temperature: a. manganese b. molybdenum c. silicon d. nickel

Answer 46

d.

Question 47

47. Ordinary steel begins to lose strength elasticity significantly at about __ ºF: a. 900 to 1000ºF b. 800 to 900ºF c. 750 to 850ºF d. 600 to 700ºF

Answer 47

d.

Question 48

48. For a high corrosion resistant stainless steel, what minimum chromium content is required? a. 8% b. 4.3% c. 1.1% d. 5.8%

Answer 48

a.

Question 49

49. Killed steel is always associated with: a. silicon b. manganese c. phosphorous d. sulfur

Answer 49

a.

Question 50

50. The usual ratio of water to soluble oil used as cutting fluid: a. 50% of water to 50% of oil b. 2 water to 1 oil c. 3 water to 1 oil d. 4 to 80 water to 1 oil

Answer 50

d.

Question 51

51. The good deoxidizer in steel melting: a. manganese b. silicon c. all of these d. aluminum

Answer 51

c.

Question 52

52. What is the common cutting fluids used for cutting metals? a. all of these b. water with soda or borax c. light mineral oil d. soluble oil

Answer 52

a.

Question 53

53. It is considered semi-solid lubricant: a. all of these b. lube oil c. graphite d. grease

Answer 53

d.

Question 54

54. Metals are conductive because: a. the electrons are loosely bound to the nuclei and therefore mobile b. having a characteristics metallic luster c. they are on the left side for the periodic table d. they have extra electrons as exhibited by normally possible balance state

Answer 54

a.

Question 55

55. The yield strength of a regular yellow brass (65 to 75% Cu, 30 to 35%Zn) can be increased/improved by: a. cold working b. tempering c. chill casting d. heat treatment

Answer 55

a.

Question 56

56. Used in as cast condition steel casting with carbon content less than __ %C a. 0.26 b. 0.15 to 0.18 c. 0.20 d. 0.25

Answer 56

c.

Question 57

57. Liners normally made of: a. cast iron b. alloyed bronze c. alloyed steel d. alloyed aluminum

Answer 57

a.

Question 58

58. Endurance strength is nearly proportional the ultimate strength but not with____. a. yield strength b. design stress c. shear stress d. all of the above

Answer 58

a.

Question 59

59. Hooke’s law holds good up to a. elastic limit b. yield point c. plastic limit d. breaking point

Answer 59

a.

Question 60

60. The ratio of linear stress to linear strain is called a. Modulus of elasticity b. Modulus of Rigidity c. Bulk Modulus d. Poisson’s Ratio

Answer 60

a.

Question 61

61. The Young’s modulus for mild steel is approximately equal to a. 80 GPa b. 110 GPa c. 190 GPa d. 210 GPa

Answer 61

d.

Question 62

62. It is an alloy of copper with several different elements, one of which is usually tin. a. bronze b. brass c. yellow brass d. manganese bronze

Answer 62

a.

Question 63

63. Which of the materials below has the lowest range of values of Poisson’s ratio? a. cast iron b. steel c. aluminum d. copper

Answer 63

a.

Question 64

64. Galvanized iron is a term referring to iron coated with a. tin b. nickel c. zinc d. magnesium

Answer 64

c.

Question 65

65. An alloy of copper and zinc a. bronze b. brass c. tin d. aluminum

Answer 65

b.

Question 66

66. The operation of cooling a heated piece of work rapidly by dipping it in water, brine or oil. a. tempering b. quenching c. annealing d. normalizing

Answer 66

b.

Question 67

67. The ability of metal to be deformed considerably without rupture a. ductility b. plasticity c. malleability d. toughness

Answer 67

b.

Question 68

68. An alloy of copper and tin a. brass b. bronze c. nickel d. aluminum

Answer 68

b.

Question 69

69. A material that can wear away a substance softer than itself a. corrosion b. abrasive c. alloy components d. penetrator

Answer 69

b.

Question 70

70. An amorphous solid made by fusing silica with a basic oxide a. pearlite b. glass c. silicon d. chip

Answer 70

b.

Question 71

71. A device used to prevent leakage of media a. packing b. teflon c. seal d. cover adhesive

Answer 71

c.

Question 72

72. Fluid film desired between two surfaces having relative sliding motion a. lube oil b. grease c. graphite d. lubricant

Answer 72

d.

Question 73

73. The ability of a material or metal to resist being crushed a. compressive strength b. fatigue strength c. torsional strength d. bending strength

Answer 73

a.

Question 74

74. The ability of metal to withstand forces thus following a number of twist a. shear strength b. bearing strength c. endurance limit d. deformation

Answer 74

a.

Question 75

75. The process commonly used for thermo-plastic material is a. die casting b. injection molding c. shell molding d. cold forming

Answer 75

b.