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

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

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Structural Analysis
When a series of wheel loads crosses a simply supported girder, the maximum bending moment under any given wheel load occurs when

None of these
The centre of gravity of the load system is midway between the centre of span and wheel load under consi-deration
The centre of span is midway between the centre of gravity of the load system and the wheel load under consideration
The wheel load under consideration is midway between the centre of span and the centre of gravity of the load system

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

The diameter of the bar if their diameters are same
5 mm more than nominal maximum size of the coarse aggregate
The diameter of the longer bar if their diameters are unequal
Greatest value of the above

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