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Theory of Structures

Theory of Structures
The ratio of the stresses produced by a suddenly applied load and by a gradually applied load on a bar, is

1
1/2
1/4
2

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Theory of Structures
The vertical reaction for the arch is

wa/2l
wa²/2l
wa/l
wl/a

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

Guest's or Trecas' theory
Haig's theory
Rankine's theory
St. Venant's theory

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Theory of Structures
Flat spiral springs

Consist of uniform thin strips
Are wound by applying a torque
Consist of uniform thin strips
All of these

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Theory of Structures
The ratio of the length and diameter of a simply supported uniform circular beam which experiences maximum bending stress equal to tensile stress due to same load at its mid span, is

1/2
1/3
1/4
1/8

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Theory of Structures
A steel bar 5 m × 50 mm is loaded with 250,000 N. If the modulus of elasticity of the material is 0.2 MN/mm² and Poisson’s ratio is 0.25, the change in the volume of the bar is:

4.125 cm²
3.125 cm³
1.125 cm³
2.125 cm³

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