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)

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

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Structural Analysis
Pick up the incorrect statement from the following:

The gross section of the web of channels is the depth of the web multiplied by its thickness
The gross section of the web of plate girders is the depth of the web plate multiplied by its thickness
The gross section of the web of rolled I-beams is the depth of the beam multiplied by the web thickness
None of these

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

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

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