Structural Analysis
For stable structures, one of the important properties of flexibility and stiffness matrices is that the elements on the main diagonal
(i) Of a stiffness matrix must be positive
(ii) Of a stiffness matrix must be negative
(iii) Of a flexibility matrix must be positive
(iv) Of a flexibility matrix must be negative
The correct answer is

(i) and (iii)
(ii) and (iv)
(i) and (iv)
(ii) and (iii)

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Structural Analysis
Pick up the correct statement applicable to cased columns.

The surface and edges of the steel column should be provided a concrete cover not less than 50 mm
Single I-beam or channels back with or without flange plates may be used
All of these
Single I-beam or channels back with or without flange plates may be used

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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
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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Structural Analysis
Pick up the incorrect statement from the following:

None of these
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
The gross section of the web of channels is the depth of the web multiplied by its thickness

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