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Test: Mat or Raft Footing - Civil Engineering (CE) MCQ


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10 Questions MCQ Test - Test: Mat or Raft Footing

Test: Mat or Raft Footing for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Test: Mat or Raft Footing questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Mat or Raft Footing MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Mat or Raft Footing below.
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Test: Mat or Raft Footing - Question 1

The foundation that is used when the soil mass is sufficiently erratic?

Detailed Solution for Test: Mat or Raft Footing - Question 1

Mat footing is used where the soil contains compressible lenses or the soil is sufficiently erratic so that the differential settlement would be difficult to control.

Test: Mat or Raft Footing - Question 2

Raft foundation are generally preferred to when they are required for individual footing, is more than:

Detailed Solution for Test: Mat or Raft Footing - Question 2

Raft Foundation:
Raft foundation is generally a thick concrete slab resting on a large area of soil reinforced with steel rods and is used to support columns or walls and transfer loads from the structure to the soil.
Raft foundation may be used under the following conditions:

  • The soil has a low bearing capacity
  • The load of the structure has to be distributed over a large area
  • Individual or any other foundation area would approximately cover 50% of the total ground area beneath the structure.
  • The columns or walls are placed so closely that the individual footings would overlap
  • Stress on soil needs to be reduced
  • There is a possibility of differential settlement in case individual footing is used
  • When soil strata are unpredictable and contain pockets of compressible soil
  • The basement is to be constructed
  • Any other type of footing cannot be used advantageously
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Test: Mat or Raft Footing - Question 3

Usually, rafts are designed as _________

Detailed Solution for Test: Mat or Raft Footing - Question 3

Ordinarily, rafts are designed as reinforced concrete flat slabs using heavy beams.

Test: Mat or Raft Footing - Question 4

If a maximum settlement of 50 mm is permitted for a raft, the differential settlement must not exceed ___________

Detailed Solution for Test: Mat or Raft Footing - Question 4

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).

Test: Mat or Raft Footing - Question 5

In raft footing, if the C.G of the load coincide with the centroid of the raft, the upward load is considered as ___________

Detailed Solution for Test: Mat or Raft Footing - Question 5

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.

Test: Mat or Raft Footing - Question 6

The penetration resistance N for designing of raft should be taken at ___________ intervals.

Detailed Solution for Test: Mat or Raft Footing - Question 6

The penetration resistance N values should be taken at 75 cm intervals for a depth equal to width of the raft, below the base of the raft.

Test: Mat or Raft Footing - Question 7

The net pressure can be calculated for raft having width greater than ___________

Detailed Solution for Test: Mat or Raft Footing - Question 7

Based on the settlement criterion for raft, the net pressure can be calculated from the following equation having its width greater than 6m.
qp = 20(N-3) Rw2 kN/m2.

Test: Mat or Raft Footing - Question 8

The weight of the raft is not considered in the structural design, because ___________

Detailed Solution for Test: Mat or Raft Footing - Question 8

The weight of the raft is not considered in the structural design because it is assumed to be carried by directly by the subsoil.

Test: Mat or Raft Footing - Question 9

The net ultimate bearing capacity for raft may be determined by __________

Detailed Solution for Test: Mat or Raft Footing - Question 9

The net ultimate bearing capacity may be determined from both Skempton and Terzaghi’s equation as given below:
(i) Skempton’s equation: q nf = 5 [1 + 0.2D/B ] [1 + 0.2B/L]c
(ii) Terzaghi’s equation: q nf = 5.7[ 1 + 0.3B/L]c.

Test: Mat or Raft Footing - Question 10

Raft is subdivided in to series of beams to establish __________

Detailed Solution for Test: Mat or Raft Footing - Question 10

The raft is subdivided into a series of continuous beams (strips) centered on the appropriate column rows to establish shear failure and moment diagram.

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