51. Determine the maximum shearing stress in a helical steel spring composed of 20 turns of 20 mm diameter wire on mean radius of 80 mm when the spring is supporting a load of 2 kN?

A. 121 MPa

B. 130 MPa

C. 150 MPa

D. 120 MPa

52. A single bolt is used to lap joint two steel bars together. Tensile force on the bar is 20,000 N. Determine the diameter of the bolt required if the allowable shearing stress on it is 70 MPa.

A. 25 mm

B. 19 mm

C. 15 mm

D. 12 mm

53. Strength of materials can most aptly be described as “statics of deformable _______ bodies”.

A. elastic

B. rigid

C. compressible

D. thermal

54. It states that the elongation is proportional to the force

A. Pascal’s Law

B. Hooke’s Law

C. Young’s Theorem

D. Farrell’s Law

55. The modulus of elasticity is also known as

A. Young’s modulus

B. Modulus of rigidity

C. Hooke’s ratio

D. Yield strength

56. A ________ material is one having a relatively large tensile strain up to the point of rupture

A. malleable

B. brittle

C. conductible

D. ductile

57. A ________ material has a relatively small strain up to the point of rupture

A. brittle

B. malleable

C. ductile

D. conductible

58. The maximum stress that may be developed during a simple tension that the stress is a linear function of strain.

A. elastic limit

B. proportional limit

C. yield point

D. rupture point

59. The maximum stress that may be developed during a simple tension test such that there is no permanent or residual deformation when the load is entirely removed

A. elastic limit

B. proportional limit

C. yield point

D. rupture point

60. The region of the stress-strain curve extending from the origin to the proportional limit is called

A. rigid range

B. malleable range

C. elastic range

D. plastic range

61. The region of the stress-strain curve extending from the proportional limit to the point of rupture is called

A. rigid range

B. malleable range

C. elastic range

D. plastic range

62. The ordinate of the point at which there is an increase in strain with no increase in stress is known as

A. elastic limit

B. proportional limit

C. yield point

D. rupture point

63. The maximum ordinate to the curve

A. yield strength

B. ultimate strength

C. tensile strength

D. both B and C are correct

64. The ratio of the strain in the lateral direction to that in the axial direction

A. Pascal’s Number

B. Factor of Safety

C. Young’s Modulus

D. Poisson’s ratio

65. Defined as the ratio of the ultimate strength to the specific weight

A. Specific Strength

B. Specific Rigidity

C. Specific Modulus

D. Specific Gravity

66. Defined as the ratio of the Young’s modulus to the specific weight

A. Specific Strength

B. Specific Rigidity

C. Specific Modulus

D. Specific Gravity

67. One of the same elastic properties at all points in the body

A. heterogeneous material

B. multistate material

C. homogenous material

D. monostate material

68. One of having the same elastic properties in all directions at any one point of the body

A. Orthotropic

B. Isotropic

C. Anisotropic

D. Monotropic

69. Material that does not possess any kind of elastic symmetry

A. Orthotropic

B. Isotropic

C. Anisotropic

D. Monotropic

70. Material that has three mutually perpendicular planes of elastic symmetry

A. Orthotropic

B. Isotropic

C. Anisotropic

D. Monotropic

71. The change of volume per unit volume is defined as the

A. Convection

B. Dilatation

C. Expansion

D. Mutation

72. A measure of the resistance of a material to change of volume without change of shape or form

A. Young’s modulus

B. Modulus of rigidity

C. Bulk modulus

D. Shear modulus

73. Stresses arising when a change in temperature affects the original length of a body

A. Kelvin stress

B. Thermal stress

C. Hydraulic stress

D. Humid stress

74. The typical Young’s modulus of steel is

A. 145 – 170 GPa

B. 195 – 210 GPa

C. 225 – 240 GPa

D. 275 – 310 GPa

75. Poisson’s ratio of glass

A. 0.16

B. 0.19

C. 0.23

D. 0.27

76. The yield strength of pure aluminum is

A. 7 – 11 MPa

B. 7 – 11 GPa

C. 2 – 5 MPa

D. 2 – 5 GPa

77. One Newton per square meter is one

A. Joule

B. Watt

C. Pascal

D. Kelvin

78. Stress on an object is _________ its cross sectional area

A. directly proportional to

B. inversely proportional to

C. less than

D. greater than

79. The condition under which the stress is constant or uniform is known as

A. Shearing stress

B. Tangential stress

C. Torsion

D. Simple stress

80. Tensile and compressive stress are caused by forces _________ to the areas on which they act

A. perpendicular

B. parallel

C. angled

D. skew

81. Which of the following is/are known as tangential stress?

A. Circumferential stress

B. Hoop stress

C. Girth stress

D. All of the above

82. The maximum safe stress a material can carry

A. Optimum stress

B. Working stress

C. Differential stress

D. Partial stress

83. It is the change in shape and / or size of a continuum body after it undergoes a displacement between an initial and a deformed configuration

A. Deformation

B. Distortion

C. Deflection

D. Dilation

84. Expressed as the ration of total deformation to the initial dimension of the material body in which forces are being applied.

A. Elasticity

B. Dislocation

C. Stress

D. Strain

85. Engineering strain is also known as

A. Hooke strain

B. Cauchy strain

C. Couch strain

D. Pascal strain

86. When a material is stretched in one direction and the other direction tends to contract, the Poisson’s ratio is

A. Positive

B. Negative

C. Zero

D. Cannot be determined

87. When a material is stretched in one direction and the other direction tends to expand, the Poisson’s ratio is

A. Positive

B. Negative

C. Zero

D. Cannot be determined

88. Which of the following is known to have no contractions or expansion when stretched in the other direction?

A. Cast iron

B. Sand

C. Auxetics

D. Cork

89. Which of the following materials is known to expand instead of contracting when stretched in the other direction?

A. Cast iron

B. Sand

C. Auxetics

D. Cork

90. Is the twisting of an object due to an applied torque.

A. Torsion

B. Radial distortion

C. Circumferential shear

D. Centrifugal force

91. The angle of twist is measured in

A. Mils

B. Gradians

C. Radians

D. Degrees

92. It is the rotational force down a shaft

A. Pressure

B. Torque

C. Torsion

D. Tangential load

93. It is made of elastic material formed into the shape of a helix which returns to its natural length when unloaded

A. Autumn

B. Spring

C. Spiral

D. Beam

94. The form of deformation of a spring is

A. Twisting

B. Volume expansion

C. Elongation

D. None of the above

95. A 6 mm bar is subjected to a tensile force of 4000 N. Find the stress.

A. 333.33 MPa

B. 70.74 MPa

C. 435.34 MPa

D. 43.30 MPa

96. If the circumference of the cross section of a cylindrical bar is 25mm, what maximum axial load can it handle if the stress is not to exceed 100 MPa?

A. 4973.59 N

B. 4932.43 N

C. 4901.53 N

D. 4892.43 N

97. What is the minimum diameter of a bar subjected to an axial load of 6.5 kN if its ultimate stress is 140 MPa

A. 2.43 mm

B. 4.24 mm

C. 6.34 mm

D. 7.69 mm

98. A hollow cylindrical baris subjected to an axial load of 4.5 kN. If the inner diameter is 3mm, what should the outer diameter be if it is not to exceed 125 MPa?

A. 4.34 mm

B. 8.53 mm

C. 7.41 mm

D. 5.34 mm

99. Determine the outside of a hollow steel tube that will carry a tensile load of 500 kN at a stress of 140 MPa. Assume the wall thickness to be one tenth of the outside diameter.

A. 104 mm

B. 113 mm

C. 134 mm

D. 153 mm

100. A 20 m bar with a square cross section of 9 mm2 is subjected to a tensile force without exceeding its ultimate stress. If the bar is to be replaced by cylindrical one, what should the diameter be?

A. 4.34 mm

B. 8.32 mm

C. 3.39 mm

D. 1.24 mm

101. Two plates are being pulled at opposite directions with a load of 20 kN. If the plates are secured by two bolts 75 mm in diameter, what is the shearing stress applied to each bolt?

A. 4.23 MPa

B. 3.21 MPa

C. 2.26 MPa

D. 1.28 MPa

102. Three plates, secured by a 60 mm bolt, are being pulled at opposite directions alternately. What pulling force is needed to shear off the bolt if it can withstand a stress of up to 175 MPa?

A. 434 kN

B. 242 kN

C. 495 kN

D. 272 kN

103. What force is required to punch off a 5 mm hole out of a 4 mm thick plate if the ultimate punching stress is 200 MPa?

A. 15.53 kN

B. 17.45 kN

C. 14.43 kN

D. 12.57 kN

104. A hole is to be punched out of a plate having an ultimate shearing stress of 300 MPa. If the compressive stress in the punch is limited to 400 MPa, determine the maximum thickness of plate from which a hole, 100 mm in diameter can be punched.

A. 33.3 mm

B. 17.9 mm

C. 13.4 mm

D. 26.9 mm

105. A cylindrical vessel with wall diameter of 15 mm containing gas holds pressure of 30 MPa. If the thickness is 10% of the inner diameter, what is the longitudinal stress?

A. 150 MPa

B. 125 MPa

C. 100 MPa

D. 75 MPa

106. What is the tangential stress in question 51?

A. 150 MPa

B. 125 MPa

C. 100 MPa

D. 75 MPa

107. If the tensile stress of a spherical vessel is limited to 17 MPa, what is the minimum thickness allowed if its inner radius is 7 mm containing gas with 20 N/mm2 of pressure?

A. 2.06 mm

B. 4.12 mm

C. 6.24 mm

D. 8.75 mm

108. What is the bearing stress if a 15kN force is applied to plates 9 mm thick secured by a bolt 8 mm in diameter?

A. 453.32 MPa

B. 321.43 MPa

C. 431.43 MPa

D. 208.33 MPa

109. What is the elongation if a steel bar 7m long is subjected to a temperature change of 17oC? Use α = 11.7 x 10-6 / Co.

A. 1.34 mm

B. 13.44 mm

C. 134.44 mm

D. 1.34 m

110. By how much will a 15m steel rod with diameter of 3mm elongate if it is subjected to a tensile load of 26 kN. Use E=200 GPa

A. 293.34 mm

B. 67.34 mm

C. 275.87 mm

D. 69.34 mm

111. At temperature of 25oC, a 17 m rod 8 mm in diameter is subjected to a tensile load of 24 kN. At what temperature without the load will the bar have the same elongation? Use α = 13.8 x 10-6 / Co and E = 180 GPa.

A. 115 oC B. 217 oC C. 245 oC D. 287 oC

112. A cylindrical bar 75 m long is attached to the ceiling atone end. At what new length could be expected if it has a unit mass of 5000 kg/m3? Use E = 750 MPa.

A. 75.023 m

B. 75.104 m

C. 75.184 m

D. 75.245 m

113. A 7mm bar 9 m long is attached to the ceiling at one end. If a weight of 40 kN is hung on its lower end, what is the total elongation? Use E = 200 GPa and unit mass of kg/m3.

A. 46.78 mm

B. 45.34 mm

C. 48.33 mm

D. 52.23 mm

114. A steel wire 10 m long, hanging vertically supports a tensile load of 2000 N. Neglecting the weight of the wire, determine the required diameter

if the stress is not to exceed 140 MPa and the total elongation is not to exceed 5 mm. Assume E = 200 GPa.

A. 4.26 mm

B. 3.12 mm

C. 5.05 mm

D. 2.46 mm

115. A steel rod having a cross-sectional area of 300mm2 and length of 150 m is suspended vertically from one end. It supports a load of 13 kN at the lower end. If the unit mass of steel is 5120 kg/m3 and E=200 GPa, find the total elongation of the rod.

A. 33.45 mm

B. 54.33 mm

C. 53.44 mm

D. 35.33 mm

116. What is the torsion on a solid cylindrical shaft whose diameter is 6 mm subjected to a rotational force of 27 N-m?

A. 434.31 MPa

B. 542.46 MPa

C. 255.44 MPa

D. 636.62 MPa

117. What is the maximum torque allowed if a 12 mm shaft is allowed torsion of up to 40 MPa only?

A. 13.57 N-m

B. 15.34 N-m

C. 18.34 N-m

D. 23.43 N-m

118. How many degrees of rotational deformation would occur on an 8 m cylindrical bar 8 mm in radius if it subjected to torque of 95 N-m?

A. 56.34o

B. 35.62o

C. 92.32o

D. 43.53o

119. What is the torque if the power transmitted by a shaft rotating at 30 rev/s is 1 MW?

A. 8.342 kN-m

B. 3.532 kN-m

C. 7.453 kN-m

D. 5.305 kN-m

120. A cylindrical solid shaft 7 mm in diameter is rotating at 18 rev/s. What is the maximum allowable power transmitted if the stress should not exceed 380 MPa?

A. 3.43 kW

B. 5.23 kW

C. 1.53 kW

D. 2.89 kW

121. Determine the length of the shortest 2-mm diameter bronze wire which can be twisted through two complete turns without exceeding a shearing stress of 343 MPa. Use G = 35 GPa.

A. 6280 mm

B. 3420 mm

C. 1280 mm

D. 1658 mm

122. A solid steel shaft 5 m long is stressed to 60 Mpa when twisted through 4o. Using G=83 GPa, compute the power that can be transmitted by the shaft at 20 rev/s.

A. 1.21 MW

B. 1.67 MW

C. 3.21 MW

D. 1.26 MW

123. A helical spring with mean radius of 40 mm has wire diameter of 2.7 mm. What is the shearing stress if there is a 22 N load? Use the approximate formula.

A. 325.32 MPa

B. 231.54 MPa

C. 432.43 MPa

D. 154.67 MPa

124. Solve question 123 using the exact formula.

A. 238.29 MPa

B. 431.32 MPa

C. 365.35 MPa

D. 153.64 MPa

125. By how much will a spring with 9 turns elongate if it supports a weight of 400 N? The wire diameter is 6 mm and the mean radius is 28 mm. Use G=150 GPa.

A. 64.35 mm

B. 42.43 mm

C. 26.02 mm

D. 16.65 mm

126. A helical spring is made by wrapping steel wire 20 mm in diameter around a forming cylinder 150 mm in diameter. Compute number of turns required to permit an elongation of 132 mm without exceeding a shearing stress of 184.8 MPa. Use G = 83 GPa.

A. 15.43 turns

B. 13.83 turns

C. 18.24 turns

D. 12.36 turns

127. Determine the maximum shearing stress in a helical steel spring composed of 20 turns of 20-mm diameter wire on a mean radius of 80 mm when the spring is supporting a load of 2 kN. Use the exact formula.

A. 120.6 MPa

B. 117.9 MPa

C. 132.4 MPa

126.9 MPa

151. The section of a beam at which the bending moment changes from positive to negative is called.

A. Critical point

B. Deflection point

C. Point of inflection

D. None of the above

152. A circular steel plate must fit into an opening whose area is fifty square inches. Find the diameter of the plate to two decimal places.

A. 7.98 in.

B. 8.65 in.

C. 6.45 in.

D. 9.60 in.

153. Find the constant of 81 Hp in a 3 inches cold rolled line shafting which transmitted 210 rpm.

A. 900

B. 600

C. 800

D. 500

154. A steel wire 10 m. long , hanging vertically supports a tensile Load of 1000 N. Neglecting the weight of the wire, determine The required diameter if the elongation is not to exceed 2.5 mm. Assume e = 200 gpa.

A. 5.046 mm.

B. 3.596 mm.

C. 4.297 mm.

D. 6.382 mm.

155. The ratio of the lateral expansion to the longitudinal shortening of a concrete cylinder when subjected to compressive load.

A. Modulus of elasticity

B. Poisson’s ratio

C. Modulus of rupture

D. None of the above

156. The moment of inertia of any plane figure can be expressed in units of length to the:

A. First power

B. Second power

C. Third power

D. Fourth power

157. The moment of inertia about the principal x – x axis of a cross section is:

A. The integral of y2Da

B. The integral of xda

C. The integral of x2Da

D. The integral of xyda

158. The stress in an elastic material is:

A. Inversely proportional to the materials yield strength

B. Inversely proportional to the force acting

C. Proportional to the displacement

D. Inversely proportional to the strain

159. Principal stresses occur on those planes:

A. Where the shearing stress is zero

B. Which are 45° Apart

C. Where the shearing stress in minimum

D. Which are subjected to pure tension

160. The deflection of a beam is:

A. Directly proportional to the modulus of elasticity and Moment of inertia

B. Inversely proportional to the modulus of elasticity and moment of inertia

C. Directly proportional to the load imposed and inversely to the length squared

D. Inversely proportional to the weight and length

161. Poisson’s ratio is the ratio of the:

A. Unit lateral deformation to the unit longitudinal deformation

B. Unit stress to unit strain

C. Elastic limit to proportional limit

D. Shear to compressive strain

162. The linear portion of the stress – strain diagram of steel is known as the:

A. Modulus of elongation

B. Plastic range

C. Strain hardening

D. Elastic range

163. Stress concentration factor:

A. Is a ratio of average stress on a section to the allowable stress

B. Is the ratio of areas involved in a sudden change of cross section

C. Is the ratio of maximum stress produced in a section to the average stress over the section

D. Is the load factor applied to loads

164. Modulus of rigidity of a steel member is

A. Define as the unit shear stress divided by the unit shear deformation (shear strain)

B. Equal to the modulus of elasticity divided by one plus Poisson’s ratio

C. Defined as the length divided by the moment of inertia

D. Equal to approximately 7/10 of the modulus of elasticity

165. Fixing both ends of a simply supported beam that has a uniform load throughout the span will increase the allowable load by:

A. 25%

B. 50%

C. 75%

D. 100%

166. The area of the shear diagram between any two points on the beam is equal to:

A. Change in shear between two points

B. Total shear between the two points

C. Average moment between the two points

D. Change in moment between the two points

167. A thin walled cylindrical shell has an internal diameter of 2 m. And is fabricated from plates 20 mm. Thick. Calculate the safe pressure in the shell if the tensile strength of the Plate is 400 kN/mm2 and the factor of safety is 6.

A. 1.33 n/mm2

B. 0.33 n/mm2

C. 13.3 n/mm2

D. 133.3 n/ mm2

168. The linear portion of the stress-strain diagram of the steel is known as the:

A. Modulus of elongation

B. Plastic range

C. Strain hardening

D. Elastic range

169. For a system to be in equilibrium, the sum of the external forces acting on the system must be:

A. Equal to unity

B. A maximum

C. Indeterminate

D. Zero

170. A short structural member of length l, area a and modulus of elasticity e, subjected to a compression load of p. The member will:

A. Elongated by pl/ae

B. Shorten by pl/ae

C. Buckle at π2 Ei/ll

D. None of the above

171. What is a metal characteristic to withstand forces that cause twisting?

A. Torsional strength

B. Modulus of elasticity

C. Twisting moment

D. Elasticity

172. Determine the estimate weight of an A-36 steel plate size 3/16 x 6’ 20’.

A. 919 lbs.

B. 1012 lbs.

C. 829 lbs.

D. 735 lbs.

173. A 3’’ diameter short shaft carrying two pulley close to the bearings transmit how much horsepower if the shaft makes 280 rpm?

A. 199 hp

B. 198 hp

C. 200 hp

D. 210 hp

174. What pressure is required to punch a hole 2’’

A. 10 tons

B. 20 tons

C. 30tons

D. 40 tons

175. Compute the working strength of a 1’’ bolt which is screwed up tightly in a packed joint when the allowable working stress is 13000psi?

A. 3600 psi

B. 3950 psi

C. 3900 psi

D. 3800 psi

176. What is the working strength of a 2’’ bolt which is screwed up tightly in a packed joint when the allowable working stress is 12000 psi?

A. 20,120 lbs.

B. 25,347 lbs.

C. 20,443 lbs.

D. 20,200 lbs.

177. Compute the speed of the gear mounted on a 52.5 mm diameter shaft receiving power from a driving motor with 250hp.

A. 2182 rpm

B. 2071 rpm

C. 2282 rpm

D. 2341 rpm

178. What force p is required to punch a ½ in. Hole on a 3/8 in. Thick plate if the ultimate shear strength of the plate is 42000 psi?

A. 24940 lbs

B. 24620 lbs

C. 24960 lbs

D. 24740 lbs

179. A hollow shaft has inner diameter of 0.035 m. And outer Diameter of 0.06 m. Determine the polar moment of inertia of the hollow shaft.

A. 1.512 x 10-6 m4

B. 1.215 x 10-6 m4

C. 1.152 x 10-6 m4

D. 1.125 x 10-6 m4

180. What is the modulus of elasticity if the stress is 44,000 psi and a unit of 0.00105?

A. 41.905 x 106

B. 42.300 x 106

C. 41.202 x 106

D. 43.101 x 106

181. Determine the thickness of a steel air receiver with 30 inches diameter and pressure load of 120 psi. Design stress of 8000 psi.

A. ¼ in.

B. 5/8 in.

C. 3/8 in.

D. ½ in.

182. The section modulus of a rectangular of base “b” and height “h” about its base is:

A. Bh2/6 B. Bh3/3 C. Bh2/12 D. Bh3/12

183. A 2-in. Solid shaft is driven by a 36-in. Gear and transmits power at 120 rpm. If allowable shearing stress is 12 psi, what Horsepower can be transmitted?

A. 29.89

B. 35.89

C. 38.89

D. 34.89

184. A coiled spring with 5 cm. Of outside diameter is required to work under the load of 190 n. The wire diameter is 15 mm, the spring is to have 6 active coils and the ends to be closed and round. Determine the total number of coils. The modulus of rigidity is 80gpa and the mean radius is to be 23 mm, with 7 mm pitch of the spring.

A. 6.5 coils

B. 7.5 coils

C. 8.5 coils

D. 9.5 coils

185. A helical spring having square and ground ends has a total of 18 coils and its material has modulus of elasticity in shear of 78.910 GPa. If the spring has an outside diameter of 10.42 cm. and a wire diameter of 0.625 cm, compute the maximum deflection that can be produced in the spring due to a load of 50 Kgs.

A. 302 mm

B. 342 mm

C. 551 mm

D. 322 mm

186. Design the size of solid steel to be used for 500 Hp, 250 rpm application if the allowable torsional deflection is 1° and the allowable stress is 10,000 psi and modulus of rigidity is 13 X 106 Psi.

A. 5” dia.

B. 4 5/8” dia.

C. 4 7/8” dia.

D. 4 ¾” dia.

187. With the electric arc welding rate of 18 in./min., how long will It take to weld a ½ in. Thick plate by 3 ft. Long seam?

A. 3 min.

B. 2 min.

C. 1.5 min.

D. 4 min.

188. A hollow shaft has an inner diameter of 0.035 m. An outer diameter of 0.06 m. Compute for the torque if the shear Stress is not to exceed 120 GPa in nm.

A. 4500

B. 4100

C. 4300

D. 4150

189. What modulus of elasticity in tension is required to obtain a unit deformation of 0.00105 m/m from a load producing a unit tensile stress of 44,000 psi?

A. 42.300 x 106 Psi B. 41.202 x 106 Psi C. 43.101 x 106 Psi D. 41.905 x 106 Psi

190. If the ultimate shear strength of steel plate is 42,000 lb/in2, what force is necessary to punch a 0.75 inch diameter hole in an inch thick plate?

A. 63008 lbs.

B. 68080 lbs.

C. 61800 lbs.

D. 66800 lbs.

191. A steel tie rod on bridge must be made to withstand a pull of 5000 lbs. Find the diameter of the rod assuming a factor of safety of 50 and ultimate stress of 64000 lb/in2.

A. 0.75 in.

B. 0.71 in.

C. 0.84 in.

D. 0.79 in.

192. Compute the nominal shear stresses at the surface in MPa for a 40 mm DIIA, meter shaft that transmit 750 KW at 1500 rpm. Axial and bending load are assumed negligible. Torsional shearing stress is 28 n/mm2.

A. 218

B. 312

C. 232

D. 380

193. The ratio of the moment of inertia of the cross-section of the beam to the section modulus.

A. Equal to the radius gyration

B. Equal to the area of the cross-section

C. Measure a distance

D. Dependent on the modulus of elasticity of the beam measure

194. Continuous stretching under load even if the stress is less than the yield point:

A. Plasticity

B. Elasticity

C. Creep

D. Ductility

195. The maximum moment in a simple beam subject to a triangular load beginning at zero from the left support to a value at the right support occurs at distance from the left support of:

A. 0.5 l

B. 0.577 l

C. 0.667 l

D. 0.750 l

196. Shear center of a cross section:

A. Is located at the centroid for wf and doubly symmetric shapes.

B. Can be located by equilibrium of internal torsional shear stresses with external torsional forces.

C. For singly symmetry cross section such as c shape, is located at the axis of symmetry but not at the centroid.

D. All of the above

197. The stress in an elastic material is:

A. Inversely proportional to the materials yield strength

B. Inversely proportional to the force acting

C. Proportional to the displacement

D. Inversely proportional to the strain

198. The linear portion of the stress- strain diagram of steel is known as the

A. Modulus of elasticity

B. Plastic range

C. Stain hardening

D. Elastic range

199. Principal stress occur on those planes

A. Where the shearing is zero

B. Which are 45° degrees apart

C. Where the shearing stress is a maximum

D. Which are subjected to pure tension

200. The deflection of the beam is

A. Directly proportional to the modulus of elasticity and moment of inertia

B. Inversely proportional to the modulus of elasticity and moment of inertia

C. Directly proportional to the load imposed and inversely to the length squared

D. Inversely proportional to the weight and length

ANSWER KEY

51. 121 MPa

52. 19 mm

53. elastic

54. Hooke’s Law

55. Young’s modulus

56. ductile

57. brittle

58. proportional limit

59. elastic limit

60. elastic range

61. plastic range

62. yield point

63. both B and C are correct

64. Poisson’s ratio

65. Specific Strength

66. Specific Modulus

67. homogenous material

68. Isotropic

69. Anisotropic

70. Orthotropic

71. Dilatation

72. Bulk modulus

73. Thermal stress

74. 195 – 210 GPa

75. 0.23

76. 7 – 11 MPa

77. Pascal

78. inversely proportional to

79. Simple stress

80. perpendicular

81. All of the above

82. Working stress

83. Deformation

84. Strain

85. Cauchy strain

86. Positive

87. Negative

88. Cork

89. Auxetics

90. Torsion

91. Radians

92. Torque

93. Spring

94. Elongation

95. 70.74 MPa

96. 4973.59 N

97. 7.69 mm

98. 7.41 mm

99. 113 mm

100. 3.39 mm

101. 2.26 MPa

102. 495 kN

103. 12.57 kN

104. 33.3 mm

105. 75 MPa

106. 150 MPa

107. 4.12 mm

108. 208.33 MPa

109. 1.34 mm

110. 275.87 mm

111. 217 oC

112. 75.184 m

113. 46.78 mm

114. 5.05 mm

115. 35.33 mm

116. 636.62 MPa

117. 13.57 N-m

118. 35.62o

119. 5.305 kN-m

120. 2.89 kW

121. 1280 mm

122. 1.67 MW

123. 231.54 MPa

124. 238.29 MPa

125. 26.02 mm

126. 13.83 turns

127. 120.6 MPa

151. Point of inflection

152. 7.98 in.

153. 900

154. 5.046 mm.

155. Poisson’s ratio

156. Fourth power

157. The integral of y2Da

158. Proportional to the displacement

159. Where the shearing stress is zero

160. Inversely proportional to the modulus of elasticity and moment of inertia

161. Unit lateral deformation to the unit longitudinal deformation

162. Elastic range

163. Is the ratio of maximum stress produced in a section to the average stress over the section

164. Define as the unit shear stress divided by the unit shear deformation (shear strain)

165. 50%

166. Change in shear between two points

167. 1.33 n/mm2

168. Elastic range

169. Zero

170. Shorten by pl/ae

171. Torsional strength

172. 919 lbs.

173. 199 hp

174. 10 tons

175. 3600 psi

176. 25,347 lbs.

177. 2282 rpm

178. 24740 lbs

179. 1.215 x 10-6 m4

180. 41.905 x 106

181. ¼ in.

182. Bh3/12

183. 35.89

184. 8.5 coils

185. 551 mm

186. 4 5/8” dia.

187. 2 min.

188. 4500

189. 41.905 x 106 Psi

190. 61800 lbs.

191. 0.71 in.

192. 380

193. Measure a distance

194. Elasticity

195. 0.577 l

196. All of the above

197. Proportional to the displacement

198. Elastic range

199. Where the shearing is zero

200. Directly proportional to the modulus of elasticity and moment of inertia