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Theory of Structures

Theory of Structures
Stress may be defined as

Force per unit volume
Force per unit length
Force per unit area
None of these

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Theory of Structures
The general expression for the B.M. of a beam of length l is the beam carries M = (wl/2) x – (wx²/2)

An isolated load at mid span
A load varying linearly from zero at one end to w at the other end
A uniformly distributed load w/unit length
None of these

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Theory of Structures
A simply supported uniform rectangular bar breadth b, depth d and length L carries an isolated load W at its mid-span. The same bar experiences an extension e under same tensile load. The ratio of the maximum deflection to the elongation, is

L/d
L/2d
(L/3d)²
(L/2d)²

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Theory of Structures
For calculating the allowable stress of long columns σ0 = σy/n [1 - a (1/r)²]is the empirical formula, known as

Straight line formula
Rankine
Perry
Parabolic formula

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

All of these
Its mean diameter will decrease
Its number of coils will increase
It is subjected to pure bending

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Theory of Structures
The ratio of crippling loads of a column having both the ends fixed to the column having both the ends hinged, is

1
2
4
3

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