Structural Analysis
If there are m unknown member forces, r unknown reaction components and j number of joints, then the degree of static indeterminacy of a pin-jointed plane frame is given by

m + r – 2j
m + r + 2j
m + r – 3j
m – r + 2j

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Structural Analysis
Pick up the incorrect statement from the following:

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

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