For a single point load W moving on a symmetrical three hinged parabolic arch of span L, the maximum sagging moment occurs at a distance x from ends. The value of x is__________________?

A. 1
B. 2
C. 3
D. 6

A. 8 kN.m
B. 15 kN.m
C. 30 kN.m
D. 60 kN.m

A. displacements
B. force
C. displacements and forces
D. none of the above

A. the beam is prismatic
B. there is no settlement of supports
C. there is no discontinuity such as hinges within the span
D. the spans are equal

A. a unit force is applied at coordinate j and the displacements are calculated at all coordinates
B. a unit displacement is applied at co-ordinate j and the forces are calculated at all coordinates
C. a unit force is applied at coordinate j and the forces are calculated at all coordinates
D. a unit displacement is applied at co-ordinate j and the displacements are calculated at all co-ordinates

Consider the following statements
1. reduces the negative moment at support
2. increases the negative moment at support
3. reduces the positive moment at support
4. increases the positive moment at the centre of span
A. i and 4 are correct
B. 1 and 3 are correct
C. 2 and 3 are correct
D. 2 and 4 are correct