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Theory of Structures

Theory of Structures
The ratio of circumferential stress to the longitudinal stress in the walls of a cylindrical shell, due to flowing liquid, is

1
½
2
1½

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

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

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Theory of Structures
At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of the section by

Depth of the neutral axis
Maximum tensile stress at the section
Maximum compressive stress at the section
Depth of the section

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Theory of Structures
A steel rod of sectional area 250 sq. mm connects two parallel walls 5 m apart. The nuts at the ends were tightened when the rod was heated to 100°C. If steel = 0.000012/C°, Esteel = 0.2 MN/mm², the tensile force developed at a temperature of 50°C, is

100 N/mm 2
150 N/mm²
80 N/mm²
120 N/mm²

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Theory of Structures
The maximum magnitude of shear stress due to shear force F on a rectangular section of area A at the neutral axis, is

3F/2A
F/2A
F/A
2F/3A

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Theory of Structures
In plastic analysis, the shape factor for rectangular section, is

1.4
1.6
1.5
1.7

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