ELEMENTS 7 Flashcards by alyssa everlyn evangelista

Hardening the surface of iron – based alloys by heating then below the melting point in contact with a carbonaceous substance.

A. Carburizing
B. Normalizing
C. Mar tempering
D. Hardening

A. Carburizing

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A special metal formed when two or more metals are melted together.

A. Monel
B. Alloy
C. Solder
D. Hastalloy

B. Alloy

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The softening of metal by heat treatment and most commonly consist of heating the metal up to near motion state and then cooling it very slowly.

A. Annealing
B. Indexing
C. Knurling
D. Soldering

A. Annealing

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Substances having sufficient carbon and/or hydrogen for chemical oxidation to produce exothermally, worthwhile quantities of heat.

A. Lubrication
B. Graphite
C. Grease
D. Fuels

D. Fuels

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The principal material used in high production metal working tools.

A. Hyper – Eutectoid
B. High speed steel
C. Lead
D. High speed carbon

B. High speed steel

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Subjecting a substance to a high temperature below the fusion point usually to make it friable.

A. Calcination
B. Fusion
C. Boiling
D. Super heating

A. Calcination

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The operation of cooling a heated peace of work rapidly by dipping it n water, brine or oil.

A. Quenching
B. Annealing
C. Tempering
D. Normalizing

A. Quenching

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A metallic elements and only metal that is liquid at ordinary temperature.

A. Aluminum
B. Mercury
C. Zirconium
D. Zinc

B. Mercury

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A metallic element of copper – tin alloy.

A. Aluminum
B. Brass
C. Bronze
D. Chromium

C. Bronze

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An alloy of copper and zinc.

A. Aluminum
B. Brass
C. Bronze
D. Chromium

B. Brass

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Which of the following is the allowable tensile strength of the steel plates?

A. 396.41 N/m2
B. 379.31 N/m2
C. 296.12 N/m2
D. 310.11 N/m2

A. 396.41 N/m2

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Which of the following standard SAE designation of manganese steel?

A. 13xx
B. 11xx
C. 10xx
D. 8xx

A. 13xx

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Compute the torque received by the motor shaft running at 4250 rpm. Transmitting 11 Hp, through a 10 in diameter 200 involute gear. The shaft is supported by ball bearings at both ends and the gear is fixed at the middle of 8” shaft length.

A. 163 in. lb
B. 132 in. lb
C. 167 in. lb
D. 138 in. lb

A. 163 in. lb

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The SAE 2340 shafting contains how many percent nickel?

A. 3.85 Ni
B. 3.25 to 3.75% Ni
C. 4% Ni
D. 3.84% Ni

B. 3.25 to 3.75% Ni

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Which of the following standard SAE designation for chromium steel?

A. 92xx
B. 3xxx
C. 5xxx
D. 11xx

C. 5xxx

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In general, alloys with high nickel content retain toughness to quiet low temperatures up to how many degrees Fahrenheit?

A. – 380
B. – 260
C. – 400
D. – 320

D. – 320

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The length of the hub should not be made lesser than the face width of the gear. Hub lengths usually vary from 1.25D to 2D where D is the shaft diameter. What should be the reasonable diameter of steel hub?

A. 2D
B. 1.55D
C. 1.8D
D. 1.20D

C. 1.8D

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Torsional deflection is a significant consideration in the design of shaft and the limit should be in the range of how many degree/foot of length?

A. 0.4 to 1
B. 0.08 to 1
C. 0.01 to 1
D. 0.6 to 1

B. 0.08 to 1

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If the pitch of a screw is 2/9 find the thread per inch.

A. 0.34
B. 5.4
C. 4.5
D. 17

C. 4.5

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Steel spring material is usually hardened from 400 to 500 BHN and the carbon content is in the range of how many percent?

A. 0.50 to 0.90%
B. 0.45 to 0.48
C. 0.96 to 0.97
D. All of these

A. 0.50 to 0.90%

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Which of the following is not a classification of iron ore?

A. Hematite
B. Magnetite
C. Sulfurite
D. Siderite

C. Sulfurite

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A soft yellow metal, known since ancient times as a precious metal which all materials values.

A. Solid’s
B. Bronze
C. Gold
D. Austenite

C. Gold

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An amorphous solid may be fusing silica with a basic oxide.

A. Pearlite
B. Rock
C. Silicon
D. Glass

D. Glass

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A fine grained salty silica rock used for sharpening edge tools

A. Eutectoid
B. Austenite
C. Oilstone
D. Pearlite

C. Oilstone

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25. A highly transparent and exceedingly hard crystalline stone of almost pure carbon is called A. Gold B. Diamond C. Bronze D. Crystalline

B. Diamond

26. The common deoxidizer and cleanser of steel forming oxides and sulfates that are carried off in the slag. A. Manganese B. Carbon C. Tungsten D. Sulfur

A. Manganese

27. An alloy of copper, tin and small amount of phosphorous. A. Chromium B. Bronze C. Brass D. Aluminum

B. Bronze

28. The material used in high speed processes. A. High speed B. Chromium C. Cast iron D. Carbon steel

A. High speed

29. A material that can wear away a substance softer than itself is called. A. Abrasive B. Corrosive C. Tungsten D. Alloy

A. Abrasive

30. The process of heating a piece of steel to a temperature within or above critical range and cooling rapidly. A. Normalizing B. Hardening C. Annealing D. Tempering

B. Hardening

31. Shafts readily available in the market are made in many ways and wide variety of material composition. It is likely be cold drawn carbon steel in size smaller than _____ inches diameter. A. 3.75 B. 5 C. 4 D. 51/2

A. 3.75

32. Plain carbon steel standard designation SAE _____. A. 6xxx B. 10xx C. 13xx D. 2xxx

B. 10xx

33. If the inertia is 90 lb. ft2 and the speed of the driven shaft is to be increased from 0 to 2500 rpm in 5 seconds, shaft material is of SAE 4140 with yield strength of 110000 lbs./in.2, find the clutch starting torque in in. – lb ft. A. 159 B. 146 C. 128 D. 191

B. 146

35. Which of the following cannot be used in drilling machine? A. Reaming B. Lapping C. Spot facing D. Broaching

C. Spot facing

36. A kilowatt is equal to: A. 8851.2 in. – lb/sec B. 57 BTU/min. C. 1140 joule/sec. D. 44.200 ft. – lb./min.

B. 57 BTU/min.

37. Molybdenum-chromium-nickel steel designation. A. SAE 48xx B. SAE 56xx C. SAE 43xx D. SAE 46xx

C. SAE 43xx

38. Single forces which produces the same effect upon a mass replacing two or more forces acting together is called: A. Vector B. Component of forces C. Resultant D. Resolution

C. Resultant

39. Permissible variation of the manufactured/machined dimension is called: A. Intolerance fits B. Allowance C. Deviation D. Tolerance

D. Tolerance

40. Peculiar strength of the metal to resist being crushed. A. Shear strength B. Compressive strength C. Ultimate strength D. Elastic limit

B. Compressive strength

41. The process of checking or producing checkers on the surface of a piece by rolling checkered depression into the surface is called. A. Knurling B. Hemming C. Breading D. Embossing

A. Knurling

42. A material used in softening a piece of metal that is too hard to machine and is done by heating steel slowly above the usual hardening temperature keeping it at the heat for ½ to 2 hours then cooling slowly, preferably in a furnace. A. Broaching B. Quenching C. Normalizing D. Annealing

D. Annealing

43. A manganese steel containing approximately 0.20% carbon. A. SAE 1320 B. SAE 1230 C. SAE 2340 D. SAE 4230

A. SAE 1320

34. How many 5/16 inch holes can be punch in one motion in a steel plate made of SAE 1010 steel 7/16 inch thick using a force of 55 tons. The ultimate strength for shear is 50 ksi and use 2 factor of safety. A. 5.8 B. 5 C. 3.7 D. 6.5

B. 5

44. Heating to some 1000F above the transformation range with subsequent cooling to below that range in still air at room temperature to produce uniform structure of metal is termed as. A. Annealing B. Hardening C. Normalizing D. Tempering

C. Normalizing

45. Heating to a sub-critical temperature about 1,100oF to 1300oF and holding at that temperature for a suitable time for the purpose of reducing internal residual stresses is called A. Annealing B. Hardening C. Tempering D. Stress relieving

D. Stress relieving

46. Reheating to a temperature below the transformation range, followed by any desired rate of cooling to attain the desired properties of the metal. A. Annealing B. Hardening C. Tempering D. Stress relieving

C. Tempering

47. The effect of alloying zinc to copper is A. To increase hardness B. To increase strength and ductility if added up to 10 – 30% C. To impart free-machining properties D. To improve hardness and strength

B. To increase strength and ductility if added up to 10 – 30%

48. Polyesters belong to the group of: A. Phenolics B. Thermoplastic plastics C. Thermo setting plastics D. All of these

C. Thermo setting plastics

49. The imperfection in the crystal structure of metal is known as: A. Dislocation B. Fracture C. Impurity D. Slip

A. Dislocation

50. The most important element that controls the physical properties of steel is: A. Carbon B. Chromium C. Silicon D. Tungsten

A. Carbon

51. What pressure is required for punching a hole 2” dia thru ¼” steel plates? A. 40 tons B. 45 tons C. 50 tons D. 35 tons

A. 40 tons

52. What is the working strength of a 2” bolt which is screwed up tightly in a packed joint when the allowable working stress is 12,000 psi. A. 20.4 ksi B. 23.4 ksi C. 22.4 ksi D. 18 ksi

A. 20.4 ksi

53. Determine the bursting steam pressure of a steel shell with diameter of 10 inches and made of ¼” thick steel plate. The joint efficiency is at 60% and the tensile strength is 60 ksi. A. 4200 psi B. 42.8 ksi C. 10.5 ksi D. 8500 psi

A. 4200 psi

54. Commonly used by steel melter as deoxidizer because of its easy availability and cheap price. A. Silicon B. Zinc C. Aluminum D. Manganese

C. Aluminum

55. Curve formed by the path of a point on a straight line as it rolls along a convex base curve. The base curve is usually a circle and generally used as the profile of gear tooth. A. Axial plane B. Arc of recess C. Involute D. Arc of action

C. Involute

56. Resultant of two or more component forces is called: A. Composition of forces B. Component C. Resultant D. Collinear of forces

A. Composition of forces

57. A material having a high electrical resistance and should not be used for conductor of electric current. A. Alloyed magnesium B. Nickel C. Silicon base alloy D. Zinc

B. Nickel

58. It improves red hardness of steel. A. Silicon B. Cobalt C. Lead D. Manganese

B. Cobalt

59. Designated pipe color used in communication. A. Silver gray B. Bare C. Aluminum gray D. White

D. White

60. The design stress and factor of safety are related in the following manner. A. Design stress = ultimate stress/factor of safety B. Ultimate stress = factor of safety/design stress plus concentration factor C. Factor of safety = Design stress/ultimate stress D. Design stress = factor of safety/times stress concentration factor

A. Design stress = ultimate stress/factor of safety

61. The process commonly used over thermo-plastic materials is A. Cold forming B. Die casting C. Injection molding D. Shell molding

C. Injection molding

62. A space lattice found in alpha – iron is called the A. Body centered cubic space lattice B. Close packed hexagonal space lattice C. Face centered cubic space lattice D. None of these

A. Body centered cubic space lattice

63. A unit cell contains nine atoms is known as the A. Body centered cubic space lattice B. Close packed hexagonal space lattice C. Face centered cubic space lattice D. None of these

A. Body centered cubic space lattice

64. A knoop indenter is a diamond ground to a ________. A. Cylindrical form B. Needle form C. Prismoidal from D. Pyramidal form

D. Pyramidal form

65. Which of the following timber is used for sports goods? A. Deodar B. Mahogany C. Mulberry D. Sal

C. Mulberry

66. Super conductors A. Are non – crystalline B. Are the purest forms of metal C. Are the densest materials is D. Exist at temperature below 10oK

D. Exist at temperature below 10oK

67. Select the that has the highest specific gravity. A. Aluminum B. Brass C. High carbon steel D. Lead

D. Lead

68. For heavy loads in aircraft bearings the material used with lead to reduce the risk of seizure is A. Iron B. Silver C. Tin D. Zinc

B. Silver

69. Age – hardening is related with: A. Cast iron B. Duralumin C. German silver D. Stainless steel

B. Duralumin

70. Which of the following has highest specific strength of all structural materials? A. Chromium alloys B. Magnesium alloys C. Titanium alloys D. None of these

C. Titanium alloys

71. Not adaptable to welding due to low tensile strength and poor ductility etc. A. Copper parts B. Aluminum parts C. Cast iron materials D. Bronze parts

B. Aluminum parts

72. Bearing surface that completely surrounds the journal is also called: A. Offset bearing B. Centrally loaded bearing C. Full bearing D. Babbitt bearing

C. Full bearing

73. The purpose of lubrication is as mentioned, except: A. To lighten the load B. Prevent adhesion C. Prevent corrosion/oxidation D. Cool the moving elements

B. Prevent adhesion

74. Tools usually used in wood pattern making in foundry shop. A. Saws and chisels B. Knives and drills C. Band saw D. Drill machine

A. Saws and chisels

75. It is a plane perpendicular to the axial plane and to the pitch plane in gears the parallel axes and the plane of rotation coincides. A. Tangent plane B. Tranverse C. Straight plane D. Reference plane

B. Tranverse

76. A 36 tooth pinion with a turning speed of 300 rpm drives 120 tooth gear of 14 ½0 d involute full depth pressure angle. What would be the speed of the driven gear? A. 1000 rpm B. 90 rpm C. 100 rpm D. 140 rpm

B. 90 rpm

77. Several forces which can be combined are called: A. Resultants B. Components C. Composition of forces D. Collinear forces

B. Components

78. The surface along the fillet curves or between the fillets radius of the two adjacent teeth or a gear. A. Bottom land B. Fillet C. Flank D. Top land

A. Bottom land

79. Ideal herringbone gear helix is in the range of: A. Bottom land B. Fillet C. Flank D. Top land

A. Bottom land

80. Ideal herringbone gear helix is in the range of: A. 30 to 45 B. 25 to 30 C. 35 to 50 D. 15 to 20

A. 30 to 45

81. Addition to lead and bismuth to aluminum will produce: A. An improvement of casting characteristics B. An improvement of corrosion resistance C. One of the best known age and precipitation hardening system D. An improvement in machinability

D. An improvement in machinability

82. Hastalloy contains: A. Aluminum and nickel B. Copper and aluminum C. Nickel and copper D. Nickel and molybdenum

D. Nickel and molybdenum

83. In compression, a prism of brittle material will break. A. By forming a bulge B. By shearing along oblique plane C. In a direction along at the direction of load D. Into large number of piece

B. By shearing along oblique plane

84. The maximum hardenability of any steel depends on _______. A. The alloying elements present B. The carbon content C. The chemical composition D. The grain size

B. The carbon content

85. Steel with 0.80% carbon and 100% pearlite is known as A. Austenite B. Eutectoid C. Hyper – Eutectoid D. Solidous

B. Eutectoid

86. Substance that can increase the machinability of steel A. Phosphorous B. Phosphorous and aluminum C. Silicon and sulfur D. Sulfur graphite and aluminum

A. Phosphorous

87. Compressive strength of gray cast iron in tons per cm2 is of the order of: A. 3 – 5 B. 5 – 7 C. 7 – 10 D. 15 – 22

B. 5 – 7

88. The presence of sulphur in pig iron makes ______. A. It brittle B. It easily machinable C. It hard D. The casting unsound

D. The casting unsound

89. The hardness of steel increase it contains ______. A. Austenite B. Pearlite C. Stalactite D. Martensite

D. Martensite

90. Which one is different from the group? A. Cyaniding B. Nitriding C. Flame hardening D. Electroplating

D. Electroplating

91. A three extension coil spring are hooked in series that support a single weight of 1000 kgs. The first spring is rated at 0.400 kg/mm and the other 2 lower spring is rated at .64 kg/in. Compute the total deflection. A. 263 mm B. 156 mm C. 268 mm D. None of these

D. None of these

92. The lack of backlash in a spur gear design/operation may result to: A. Overloading B. All of these C. Jamming D. Overheating

B. All of these

93. The distance from a point on a screw thread to a corresponding point on the next thread measure along the axis. A. Flank B. Crest C. Lead D. Pitch

D. Pitch

94. As recommended the center to center distance between a sprockets should not be less than ____ times the bigger sprocket. A. 2.216 B. 1 ½ C. 1 ¾ D. 2.59

B. 1 ½

95. Machine shop instrument for checking the flatness of plane surface to 10ths of thousandths of a centimeter. A. Blade type micrometer B. Planimeter C. Dial caliper D. Micrometer

B. Planimeter

96. Molybdenum steel standard designation SAE. A. 88xx B. 40 xx C. 48xx D. 46xx

B. 40 xx

97. Also called eccentrically loaded bearing is: A. Full bearings B. Partial bearings C. Offset bearings D. Fitted bearings

C. Offset bearings

98. In the selection of wire rope, regular lay means wires and strands are arranged in the following manner. A. Twisted in the same direction B. Twisted in opposite direction C. Twisted in any direction D. Twisted in along direction

B. Twisted in opposite direction

99. In involute teeth, the pressure angle is often defined as the angle between the line of action and the line of tangent to the pitch circle. It is also termed as: A. Helix angle B. Angle of obliquity C. Angle of recess D. Arc of action

B. Angle of obliquity

100. Instantaneous center is also called: A. Centro B. Virtual center C. Rotopole D. All of these

B. Virtual center