Strength of Materials

71. The unit of Young's modulus is

  1. mm/mm
  2. kg/cm
  3. kg
  4. kg/cm2
  5. kg cm2.

Correct answer: (D)
kg/cm2

72. The value of modulus of elasticity for mild steel is of the order of

  1. 2.1xl05 kg/cm2
  2. 2.1 X 106 kg/cm2
  3. 2.1 x 107 kg/cm2
  4. 0.1 xlO6 kg/cm2 (<?) 3.8 x 106 kg/cm2.
  5. None of above

Correct answer: (B)
2.1 X 106 kg/cm2

73. The value of Poisson's ratio for cast iron is

  1. 0.1 to 0.2
  2. 0.23 to 0.27
  3. 0.25 to 0.33
  4. 0.4 to 0.6
  5. 3 to 4.

Correct answer: (B)
0.23 to 0.27

74. The value of Poisson's ratio for steel is between

  1. 0.01 to 0.1
  2. 0.23 to 0.27
  3. 0.25 to 0.33
  4. 0.4 to 0.6
  5. 3 to 4.

Correct answer: (C)
0.25 to 0.33

75. The value of shear stress which is induced in the shaft due to the applied couple varies

  1. from maximum at the center to zero at the circumference
  2. from zero at the center to maximum at the circumference
  3. from maximum at the center to mini-mum at the cricumference
  4. from minimum at the centro to maxi-mum at the circumference
  5. none of the above.

Correct answer: (B)
from zero at the center to maximum at the circumference

76. The weakest section of a diamond riveting is the section which passes through

  1. the first row
  2. the second row
  3. the central row
  4. one rivet hole of the end row
  5. none of the above.

Correct answer: (D)
one rivet hole of the end row

77. The Young's modulus of a wire is defined as the stress which will increase the length of wire compared to its original length

  1. half
  2. same amount
  3. double
  4. one-fourth
  5. four times.

Correct answer: (B)
same amount

78. True stress-strain curve for materials is plotted between

  1. load/original cross-sectional area and change in length/original length
  2. load/instantaneous cross-sectional area original area and log.
  3. load/instantaneous cross-sectional area and change in length/original length
  4. load/instantaneous area and instantaneous area/original area
  5. none of the above.

Correct answer: (B)
load/instantaneous cross-sectional area original area and log.

79. When it is indicated that a member is elastic, it means that when force is applied, it will

  1. not deform
  2. be safest
  3. stretch
  4. not stretch
  5. none of the above.

Correct answer: (C)
stretch

80. When two plates are butt together and riveted with cover plates with two rows of rivets, the joi;it is known as

  1. lap point
  2. butt joint
  3. single riveted single cover butt joint
  4. double riveted double cover butt joint
  5. single riveted double cover butt joint.

Correct answer: (D)
double riveted double cover butt joint

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