Structural Analysis
Principle of superposition is applicable when

The action of applied forces will be affected by small deformations of the structure
Material obeys Hooke's law
None of these
Deflections are linear functions of applied forces

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Structural Analysis
Pick up the correct statement for the web stiffeners.

All of these
For horizontal stiffeners, d is the clear distance between the horizontal stiffener and the tension flange
Vertical stiffeners are spaced at a distance not greater than 1.5 d and not less than 0.33 d
d is the distance between flange angles or the clear distance between flanges

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Structural Analysis
Pick up the correct statement applicable to cased columns.

Single I-beam or channels back with or without flange plates may be used
The surface and edges of the steel column should be provided a concrete cover not less than 50 mm
All of these
Single I-beam or channels back with or without flange plates may be used

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