40%
60%
50%
70 %

M25
M15
M10
M20

20 kN/cm²
200 kN/cm²
2xl06N/cm²
200kN/mm²

## Concrete Technology and Design of Concrete Structures If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section

depends on as, only
depends on aCbC only
depends on both crst and acbc
is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.

## Concrete Technology and Design of Concrete Structures The depth of footing for an isolated column is governed by i) maximum bending moment ii) shear force iii) punching shear The correct answer is

only (i)
(i) and (ii)
(i), (ii) and (iii)
(i) and (iii)

## Concrete Technology and Design of Concrete Structures For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine’s theory

is always greater than 1
is always less than 1
can be less than 1
can be more than 1