Theory of Structures

91. Maximum principal stress theory for the failure of a material at elastic point, is known

1. Guest's or Trecas' theory
2. St. Venant's theory
3. Rankine's theory
4. Von Mises' theory

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92. Maximum strain theory for the failure of a material at the elastic limit, is known as

1. Guest's or Trecas' theory
2. St. Venant's theory
3. Rankine's theory
4. Haig's theory

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93. Maximum shear stress theory for the failure of a material at the elastic limit, is known

1. Guest's or Trecas' theory
2. St. Venant's theory
3. Rankine's theory
4. Haig's theory

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94. Total strain energy theory for the failure of a material at elastic limit, is known

1. Guest's or Trecas' theory
2. St. Venant's theory
3. Rankine's theory
4. Haig's theory

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95. If a three hinged parabolic arch, (span l, rise h) is carrying a uniformly distributed load w/unit length over the entire span,

1. Horizontal thrust is wl²/8h
2. S.F. will be zero throughout
3. B.M. will be zero throughout
4. All the above

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96. The strain energy due to volumetric strain

1. Is directly proportional to the volume
2. Is directly proportional to the square of exerted pressure
3. Is inversely proportional to Bulk modulus
4. All the above

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97. A close coil helical spring when subjected to a moment M having its axis along the axis of the helix

1. It is subjected to pure bending
2. Its mean diameter will decrease
3. Its number of coils will increase
4. All the above

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98. A body is said to be in equilibrium if

1. It moves horizontally
2. It moves vertically
3. It rotates about its C.G.
4. None of these

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99. A material is said to be perfectly elastic if

1. It regains its original shape on removal of the load
2. It regains its original shape partially on removal of the load
3. It does not regain its original shape at all
4. None of these

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100. In case of a simply supported I-section beam of span L and loaded with a central load W, the length of elasto-plastic zone of the plastic hinge, is

1. L/2
2. L/3
3. L/4
4. L/5

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