Question 3
Marks : +2 | -2
Pass Ratio : 100%
The weight of the raft is not considered in the structural design, because ___________
Explanation: The weight of the raft is not considered in the structural design because it is assumed to be carried by directly by the subsoil.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
If the independent spread footing of two columns are connected by a beam, it is called ___________
Explanation: In strap footing, two independent columns are supported by as trap or beam at the bottom.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
When the allowable soil is low or the building loads are heavy, the footing used is ___________
Explanation: When the allowable soil pressure is low, or the building loads are heavy, the use of spread footings would cover more than one-half of the area and it may prove more economical to use mat or raft foundation.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
If a maximum settlement of 50 mm is permitted for a raft, the differential settlement must not exceed ___________
Explanation: A raft may undergo large settlement without causing harmful differential settlement. For this reason, almost double settlement of that permitted for footing is acceptable for raft. Therefore if a maximum settlement of 50 mm (2 in) is permitted for a raft, the differential settlement is not likely to exceed 20 mm (0.75 in).
Question 10
Marks : +2 | -2
Pass Ratio : 100%
In raft footing, if the C.G of the load coincide with the centroid of the raft, the upward load is considered as ___________
Explanation: If the Center of gravity of the load coincides with the centroid of the raft, the upward load is regarded as a uniform pressure, which will be equal to the downward load divided by the area of the raft.