Structural Analysis
A pin-jointed plane frame is unstable if (where m is number of members, r is reaction components and j is number of joints)

None of these
(m + r)<2j
(m + r)>2j
m + r = 2j

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

d is the distance between flange angles or the clear distance between flanges
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

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

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
The diameter of the longer bar if their diameters are unequal

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