Structural Analysis
For a symmetrical two hinged parabolic arch, if one of the supports settles horizontally, then the horizontal thrust

is decreased
is increased
remains unchanged
becomes zero

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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
The diameter of the bar if their diameters are same
Greatest value of the above

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