Structural Analysis
For a two-hinged arch, if one of the supports settles down vertically, then the horizontal thrust

Is increased
Remains unchanged
Becomes zero
Is decreased

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Structural Analysis
The effective length of lacing is the distance

All of these
0.7 of the distance between the inner end rivets of the bar for double lacing
Between the inner ends of effective lengths of welds connecting the members
Between the inner end rivets of the bar for single lacing

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Structural Analysis
The effective and actual lengths of a cantilever are same if continuous at the support,

Unstrained against torsion at the support and free at the end
With partial restraint against torsion of the support and free at the end
None of these
Restrained against torsion at the support and free at the end

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