## RCC Structures Design The effective width of a column strip of a flat slab, is

One-fourth the width of the panel
Half the width of the panel
Diameter of the column

D = 0.07775 aP
D = 0.0775 aP
D = 0.775 Pa
D = 0.00775 aP

## RCC Structures Design For a ribbed slab

Clear spacing between ribs shall not be greater than 4.5 cm
Overall depth of the slab shall not exceed four times the breadth of the rib
All listed here
Width of the rib shall not be less than 7.5 cm

## RCC Structures Design An R.C.C. roof slab is designed as a two way slab if

The slab is continuous over two supports
The slab is discontinuous at edges
The ratio of spans in two directions is less than 2
It supports live loads in both directions

## RCC Structures Design Total pressure on the vertical face of a retaining wall of height ‘h’ per unit run exerted by the retained earth weighing ‘w’ per unit volume, is

wh [(1 - sin φ)/(1 + sin φ)]
wh² [(1 - sin φ)/2(1 + sin φ)]
wh² [(1 - sin φ)/(1 + sin φ)]
wh² [(1 - sin φ)/3(1 + sin φ)]

Five times
Four times
Three times
Two times