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 correct statement for the web stiffeners.

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
For horizontal stiffeners, d is the clear distance between the horizontal stiffener and the tension flange

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