Elements 13

1. Which of the following is not a method of nondestructive testing of steel casting and forgings?
A. radiography
B. ultrasonic
C. magnetic particle
D. chemical analysis

2. According to the ACI code, the modular ratio, n, of structural concrete with a 28 - day ultimate compressive strength, fc, of 3000 is nearest to

A. 7
B. 6
C. 9
D. 10

3. What is the strong bond between hydrogen atoms?
A. the ionic bond
B. the metallic bond
C. ionic and metallic bond
D. the covalent bond

4. All of the following statements about air entrained concrete are correct, EXCEPT:
A. Air entrained is recommended when concrete is exposed to severe frost action.
B. With air entrainment, the quantity of water to produce a given consistency (slump) is reduced.
C. With air entrainment, the quantity of water to produce a specified 28 day compressive strength is reduced.
D. Air entrainment reduces resistance to the freeze - thaw that occurs when salt is used to melt ice or snoW.

5. In the design of a reinforced concrete structure, tensile strength of the concrete is normally —
A. Assumed to be 1/10 of the 28-day compressive strength.
B. Determined by beam tests.
C. Neglected.
D. Assumed to be 200 psi.

6. All of the following groups of plastics are thermoplastic, except

A. polyvinylchloride (PVC) and polyvinyl acetate
B. polyethylene, polypropylene, and polysterene
C. tetrafluoroethylene (Teflon) and other fluorocarbons
D. phenolics, melamine and epoxy

7. Which of the following statements is false?
A. Ceramics are inorganic, nonmetallic solids that are processed or used at high temperature.
B. Metals are chemical elements that form substances that are opaque, lustrous, and good conductors of heat and electricity.
C. Oxides, carbides, and nitrides are considered to be within the class of materials known as glasses.
D. Most metals are strong, ductile, and malleable. In general, they are heavier than most other substances.

8. In molecules of the same composition, what are variations of atomic arrangements ?
A. polymers®
В. monomers
C. isomers
D. crystal system

9. What is the atomic packing factor for a simple cubic crystal?
A. 0.48
B. 0.52
C. 0.75
D. 0.58

10. Which of the following statements is false?
A. Both copper and aluminum have a face-centered crystal structure.
B. Both magnesium and zinc have a hexagonal close-packed crystal structure.
C. Iron can have either a face-centered or a body-centered cubic crystal structure.
D. Both lead and cadmium have a hexagonal close-packed crystal structure.

11. Which crystal structure possesses the highest number of close-packed planes and close-packed direction?

A. simple cubic

B. face-centered cubic

C. body-centered cubic

D. close-packed hexagonal

12. What are most common slip planes for face-centered
• respectively?
cubic and body-centered cubic structures,
A. face-centered: (111), body-centered: (110)
B. face-centered: (100), body-centered: (110)
C. face-centered: (110), body-centered: (111)
D. face-centered: (111), body-centered: (100)

13. With regard to corrosion of metals, passivation is the process that —-
A. intensifies deterioration temporarily
B. inhibits further deterioration
C. changes the composition of the metal
D. alter the grain size of the metal

14. Past ME Board Question
Which of the following is a single crystal grown by vapor deposition?
A. Glass
B. Ceramics
C. Roving
D. Whiskers

15. Which of the following is a member of the halogen family?
A. sodium
B. hydrogen chloride
C. fluorine
D. phosphorus

16. Which of the following metals is the best heat conductor?
A. aluminum
B. gold
C. copper
D. silver

17. When exposed to the atmosphere, which of the following liquids is coldest?
A. oxygen
B. nitrogen
C. argon
D. helium

18. What is a combination of one or more metals with a nonmetallic element?

A. Metalloid

B. Matrix composite

C. Inert

D. Ceramic

19. What do you call an atom that has lost or gain an electron?
A. lon
B. Cation
C. Hole
D. Neutron

20. Polymer comes from Greek words "poly" which means
"many" and "meros" which means ——
A. metal
B. material
C. part
D. plastic

21. The engineering materials known as "plastics" are more correctly called
A. Polyvinyl chloride
B. Polymers
C. Polyethylene
D. Mers

22. What is a combination of two or more materials that has properties that the components materials do hot have by themselves?
A. Compound
B. Composite
C. Mixture
D. Matrix

23. What is a reference sheet for the elements that can be used to form engineering materials?
A. Periodic table
B. Truth table
C. Building blocks of Materials
D. Structure of Materials

24. Past ME Board Question
Which of the following is the major alloying element in Invar?
A. Copper
B. Nickel
C. Vanadium
D. Aluminum

25. Who has been accepted as the author of the periodic table which was developed by chemists in the mid-nineteenth century?

A. Vickers
B. Knoop
C. Rockwell
D. Mendeleev

26. Past ME Board Question
In sulfuric acid plant, which of the following is suitable for handling acid in concentrations up to 50% and at a temperature including the boiling point?

A. Hastelloy B
B. Inconel
C. Incone X
D. Hastelloy A

27. What physical property of a material that refers to the point at which a material liquefies on heating or solidifies on cooling?

A. Melting point
B. Curie point
C. Refractive index
D. Specific heat

28. What physical property of a material that refers to the temperature at which ferromagnetic materials can no longer be magnetized by outside forces?

A. Melting point
B. Thermal conductivity
C. Thermal expansion
D. Curie point

29. What physical property of a material refers to the ratio of the amount of heat required to raise the temperature of a unit mass of a substance 1 degree to the heat • required to raise the same mass of water to 1 degree?

A. Specific heat
B. Latent heat
C. Heat of fusion
D. Heat of fission

30. Past ME Board Question
Aluminum is particularly satisfactory for applications requiring all of the following characteristics EXCEPT

A. Good thermal conductivity

B. High strength

C. Good electrical conductivity

D. Low weight

31. Wood is composed of chains of cellulose molecules bonded together by another natural polymer called

A. plastic
B. lignin
C. mer
D. additive

32. What is a polymer production process that involves forming a polymer chain containing two different monomers?

A. copolymerization
B. blending
C. alloying
D. cross-linking

33. What is the generic name of a class of polymer which is commercially known as "nylon"?
A. polyacetals
B. polyamide
C. cellulose
D. polyester

34. Past ME Board Question
It is an age hardenable wrought alloy which has mechanical properties comparable to those of heat treated alloy steel of the same order of hardness and resistance to corrosion similar to that of monel. What is this alloy of nickel?
A. R Monel
B. KR Monel
C. S Monel
D. K Monel

35. What is a substance that attracts piece of iron?
A. Conductor
B. Semiconductor
C, Magnet
D. All of the choices

36. Which of the following is a natural magnet?
A. Steel
B. Magnesia
C. Lodestone
D. Soft iron

37. Which of the following materials has permeability slightly less than that of free space?
A. Paramagnetic materials
B. Non-magnetic materials
C. Ferromagnetic materials
D. Diamagnetic materials

38. Past ME Board Question
What is the result when mers join with a high degree of regularity in chain structure and mer orientation?
A. Isotactic polymer
B. Syndiotactic polymer
C. Trans mer
D. Atactic polymer

39. What materials has permeabilities slighter greater than that of free space?
A. Paramagnetic materials
B. Non-magnetic materials
C. Ferromagnetic materials
D. Diamagnetic materials

40. Past ME Board Question
What is the unique form of cast iron with worm shaped graphite particles?
A. Wrought iron
B. Mottled cast iron
C. Compacted graphite iron
D. Malleable cast iron.

41. Which of the following materials have very high permeabilities?
A. Paramagnetic materials
B. Non-magnetic materials
C. Ferromagnetic materials
D. Diamagnetic materials

42. Past ME Board Question
Kevlar epoxy composite is widely used in

A. interior decoration

B. aerospace

C. navy

D. Automobiles

43. It is defined by ASTM as a material that contains an essential ingredient organic substance of large molecular weight, is solid in its finished state, and at some stage its manufactured or in its processing into finished articles, can be shaped by flow.
A. Metal
B. Metalloid
C. Plastic
D. Ceramic

44. Some polymetric materials such as epoxies are formed by strong primary chemical bonds by
A. Metallic bond
B. Van der Waals bond
C. Cross linking
D. Covalent bond

45. Past ME Board Question
Which of the following is available in five slightly different nominal composition for applications which require high strength, good fabricating and fusing qualities, immunity to rust, free machining and a corrosion resistance equivalent to copper?

A. Everdur
B. Dynavar
C. Silicon
D. Titanium

46. What do you call a polymer without additives and without blending with another polymer?
A. Homopolymer
B. Ethenic polymer
C. Polyethylene
D. Copolymer

47. Supplementary Question
Delta iron occurs at temperature of
A.- room temperature
B. above melting point
C. between 1400°C &1539°C
D. between 1000°C & 1400°C

48. Past ME Board Question
Which of the following superalloys is age-hardenable?
A. Stellite
B. Nimonic
C. Incoloy
D. Inconel

49. Past ME Board Question
Which of the following is not a kind of cast iron?

A. gray iron

B. white iron


C. malleable iron
D. lead iron

50. Past ME Board Question
Which of the following metals is non-magnetic?
A. manganese steel
B. cast steel
C. alloy steel
D. cast iron

51. Past ME Board Question
An iron in which most of the carbon is chemically combined with the iron.
A. cast iron
B. gray iron
C. white cast iron
D. malleable iron

52. Past ME Board Question
A hard material
A. Yields little before breaking
B. Shows high ultimate strength
C. Shows low ultimate strength
D. Exhibits a high modulus of elasticity

53. Past ME Board Question
Material, usually ceramics, employed where resistance to very high temperature is required, as for furnace linings and metal melting pots.
A. bricks
B. insulators
C. refractories
D. ceramics

54. Past ME Board Question
It is used to prevent leakage in dynamic seal.
A. gasket
B. seals
C. felts
D. packings

55. Which of the following does cold-working cause?
A. elongation of grains in the flow direction, an increase in dislocation density, and overall increase in energy of the metal
B. elongation of grains in the flow direction, a decrease in dislocation density, and an overall decrease in energy of the metal.
C. elongation of grains in the flow direction, a decrease in dislocation density, and an overall increase in energy of the metal.
D. shortening of grains in the flow direction, a decrease in dislocation density, and an overall decrease in the energy of the metal.

56. Past ME Board Question
Surface hardening is desirable for a product that is subject to —

A. fatigue
B. high shear loads
C. high impact loads
D. high tensile loads

57. Which of the following statements is false?
A. There is a considerable increase in the hardness and the strength of a cold-worked metal.
B. Cold-working a metal significantly reduces its ductility.
C. Cold-working causes a slight decrease in the density and electrical conductivity of a metal.
D. Cold work decreases the yield point as well as the strength and hardness of the metal.

58. Past ME Board Question
What is a condition where one surface is comparatively free of stress?
A. Octahedral plane
B. Biaxial or Plane stress
C. Lateral Strain plane
D. Principal normal stress

59. Past ME Board Question
Which of the following are the compositions of stainless steel 302?
A. 18 % chromium and 8 % nickel
B. 18% nickel and 8 % chromium
C. 18 % chromium and 8 % silicon
D. 18 % bronze and 8 % vanadium

60. Which of the following is the most popular alloy spring Steel for conditions involving higher stresses than can be used with the high-carbon steels and for use where fatigue resistance and long endurance are needed?
Note: This material is also good for shock and impact loads

A. Chrome silicon
B. Chrome vanadium
C. hard-drawn wire
D. Oil-tempered wire

61. Past ME Board Question
How do you call the process of producing the residual compressive stress of machine parts, which is performed by directing the a high velocity stream of hardened balls or pellets at the surface to be treated?
A. Nitriding
B. Shot blasting
C. Peening
D. Hardening

62. Past ME Board Question
It is a process that produces residual compressive stress on the machine part, which uses a series of hammer blows on the surface.
A. Nitriding
B. Shot blasting
C. Peening
D. Impacting

63. Past ME Board Question
Which of the following is typically used in nitriding process of surface hardening?
А.
Nitrogen gas
B.
Carbon dioxide
C. Ammonia gas
D. Hydrogen gas

64. Past ME Board Question
It is a surface-hardening process for alloy steels in which the material is heated to 950 °F in a nitrogen atmosphere, typically ammonia gas, followed by slow cooling.
A. Tempering
B. Nitriding
C. Shot blasting
D. Peening

*65. Past ME Board Question
What could be the benefit in using nitriding as a surace-hardening process for alloy steels?
A. Improvement of endurance strength by 50 % or
more
B. Improvement of endurance strength of less than 50
%
C. Improvement of endurance strength by more than 50%
D. improvement on the endurance strength by 90%

66. Past ME Board Question
Which of the following ferrous metals has the lowest carbon content?

A. Carbon steel

B. Wrought iron

C. Cast iron

D. SAE 4140

67. Past ME Board Question
If stiffness is the main criterion, in selecting a material, which of the following is the most economical choice?

A. SAE 3130

B. SAE 1020

C. SAE 6150

D. AISI 301, ¼ hard stainless steel.

68. Past ME Board Question
Which of the following materials can easily be machined?
A. AISI C1020
B. AISI C1112
C. AISI C1030
D. AISI C1010

69. Past ME Board Question
The primary application of high-speed steels is to tools used for the working of metals —-

A. that are too hard

B. at high cutting speeds

C. that are too soft

D. at slow cutting speeds

70. Past ME Board Question
Stainless steels generally contain at least —- chromium, with or without other elements?
A. 16 %
B. 14 %
C. 12 %
D. 10 %

71. Past ME Board Question
Which grades of stainless steels are nonmagnetic in the annealed condition, although some may become slightly magnetic after cold working?
A. Ferritic grades
B. Austenitic grades
C. Martensitic grades
D.
None of these

72. Past ME Board Question
What heat treatment is involved if steel is heated to a temperature above the critical range, after which it is cooled in still air to produce a generally fine pearlite structure? Note: The purpose is to promote uniformity of structure and properties after a hot-working operation such as forging or extrusion.
A. Annealing
B. Normalizing
C. Tempering
D. Stress relieving

73. Past ME Board Question
A material of construction (only developed commercially in the late 1940's concurrently with zirconium) offers the unique combination of wide ranging corrosion resistance, low density, and high strength.

A. Chromium
B. Titanium
C. Vanadium
D. Molybdenum

74. Past ME Board Question
The lightest of all structural and commercial metals used in aircraft industry.
A.Aluminum
В.Titanium
C.Magnesium
D. Manganese

75. Past ME Board Question
A free-cutting steel has a higher ——comparable carbon steels.
content than
A. Sulfur
B. manganese
C. Nickel
D. Chromium

76. Past ME Board Question
Which of the following is the property that designates steel resistance to the softening effect at elevated temperature ?

A. Hot hardness
B. Machinability
C.Toughness
D. Malleability

77. Past ME Board Question
Which of the following is also known as a ductile cast iron?

A. Malleable iron
B. Nodular cast iron
C. White cast iron
D. Gray cast iron

78. Past ME Board Question
A material of construction (only developed commercially in the late 1940's concurrently with zirconium) offers the unique combination of wide ranging corrosion resistance, low density, and high strength.
A. Titanium
B. Fiber Glass
C. Vanadium .
D. Molybdenum

79. Past ME Board Question
Which of the following steels is most widely used for engineering materials that offers versatility for product design?
A. Wrought steels
B. Low carbon steels
C. Medium carbon steels
D. High Speed tool steels

80. Past ME Board Question
Which of the following steels does not readily respond to heat treatment?
A. SAE 1045
B. AISI 6150
C. SAE 1020
D. SAE 1095

81. Past ME Board Question
Which of the following alloying elements mainly used to improve the endurance strength of steel materials?
A. Zinc
B. Tungsten
C. Nickel
D. Vanadium

82. Past ME Board Question
How do you call the process of introducing carbon into low carbon steels so that hard surface will be produced ?
A. cyaniding
B. carbonitriding
C. nitriding
D. carburizing

83. What is the composition of German silver ?

A. Copper, zinc and nickel

B. Copper and zinc

C. Copper, nickel and vanadium

D. copper, nickel and manganese

84. What is the effect adding magnesium to cast iron?
A. It increases its hardness
B. it becomes more resistant to corrosion
C. It increase ductility and strength in tension
D. it decreases ductility and less resistance to cracking.

85. The hardness of steel primarily depends on which of the following?
A. manufacturing process
B. heat treatment involved
C. the amount of manganese added
D. the percentage of carbon

86. Which of the following is CORRECT regarding killed steel?
A. Killed steels have very small amount of impurity
B. Killed steels were treated without dexidation agent
C. Killed steels are sometimes called oxidized steel.
D. Killed steels are free from oxygen

87. Which of the following is an amorphous material ?
A. Glass
B. Lead
C. Silver
D. Aluminum

88. What category is high speed steel?
A. Stainless steel
B. Low carbon steel
C. Alloy steel
D. High carbon steel

89. Which of the following is a copper free alloy?

A. White metal

B. Muntz metal

C. German Silver

D. Gun metal or Red brass

90. Ball bearings are generally made of

A. high carbon chromium steel

B. Cast Iron

C. Stainless Steel

D. Low carbon steel

91. Which of the following is one of the main properties of
cast iron ?
A. Ductility
B. Wear resistance
C. Malleability
D. Toughness

92. Which of the following is used for bearing liner?
A. Polyethylene
B. Bronze
C. Babbit metal
D. Brass

93. Which of the following is the most important element that controls the physical properties of steel?
A. Carbon
B. Chromium
C. Manganese
D. Zinc

94. Which of the following hardening processes that gives maximum hardness to the surface ?
A. Nitriding
B. Cyaniding
C. Strain hardening
D. Carburizing

95. Which of the following can be easily drawn into wire?
- A. Tin
B. Copper
C. Lead
D. Zinc

96. What will decrease when the percentage of carbon in steel will increase ?
A. Hardness
B. Corrosion resistance
C. Ultimate strength
D. Ductility

97. Stainless steel is highly resistant to corrosion and rust because of the presence of —-

A. manganese
B. nickel
C. Silicon
D. chromium

98. Which of the following is obtain by isothermal hardening operation?
A. Cementite
B. Acicular troostite
C. Martensite
D. Austenite

99. How do you cal the structure obtain when steal is
slowly cooled in furnace?
A. Pearlite
B. Troosite
C. Bainite
D. Sorbite

100. What is the ratio of the velocity of light in a vacuum to its velocity in another material?
A. Refractive index
B. Poisson ratio
C. Density
D. Mach number