35
40
30
25

## RCC Structures Design The angle of internal friction of soil mass is the angle whose

Sine is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
None of these
Cosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane
Tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane

W - 2P sin θ
W - 2P cos θ
W - P sin θ
W - P cos θ

## RCC Structures Design The advantage of reinforced concrete, is due to

All listed here
Economy because of less maintenance cost
Fire-resisting and durability
Monolithic character

## RCC Structures Design In a doubly-reinforced beam if ‘c’ and ‘t’ are stresses in concrete and tension reinforcement, ‘d’ is the effective depth and ‘n’ is depth of critical neutral axis, the following relationship holds good

(m + c)/t = n/(d + n)
mc/t = (d - n)/t
mc/t = n/(d - n)
(t + c)/n = (d + n)/n

## RCC Structures Design A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n?. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is

All listed here
½ n₁ (1 - n₁/3) cbd²
Atft (d - n/3)
bn (fc/2) (d - n/3)