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Theory of Structures

Theory of Structures
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

L/2
L/3
L/5
L/4

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Theory of Structures
The area of the core of a column of cross sectional area A, is

(1/12) A
(1/6) A
(1/3) A
(1/18) A

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

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

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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

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

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Theory of Structures
A steel plate d × b is sandwiched rigidly between two timber joists each D × B/2 in section. The steel will be (where Young’s modulus of steel is m times that of the timber).

BD² + mbd³)/4D]
BD² + mbd²)/6D]
BD³ + mbd³)/6D]
BD² + mbd²)/4D]

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Theory of Structures
Flat spiral springs

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

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