Structural Analysis
Principle of superposition is applicable when

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

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Structural Analysis
When a uniformly distributed load, shorter than the span of the girder, moves from left to right, then the conditions for maximum bending moment at a section is that

the head of the load reaches the section
the tail of the load reaches the section
the load position should be such that the section divides the load in the same ratio as it divides the span
the load position should be such that the section divides it equally on both sides

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Structural Analysis
The minimum horizontal distance between two parallel main reinforcing bars, is

The diameter of the longer bar if their diameters are unequal
5 mm more than nominal maximum size of the coarse aggregate
Greatest value of the above
The diameter of the bar if their diameters are same

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