Geotechnical Engineering

Classes of Underground Conduits

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Which of the following conduit is installed in shallow bedding?
Ditch conduits
Positive projecting conduits
Special conduits
Negative projecting conduits
Explanation:
A passive projecting conduit is the one which is installed in shallow bedding, with its top projecting above the natural ground and which is then covered with an embankment.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following conduits are commonly used in highway or railway culverts?
Positive/Negative projecting conduits
Negative projecting conduits
Ditch conduits
All of the mentioned
Explanation:
Negative and positive projective conduits are used in highway or railway culverts as both can be covered with an embankment.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Which of the following values of K0 is used to compute the stress in the vicinity of a cylindrical tunnel?
K0 = 1
K0 = μ / 1-μ
K0 = 0
All of the mentioned
Explanation:
The problem of computing the stress in the vicinity of a cylindrical tunnel corresponding to the state of elastic equilibrium has been solved by Mindlin using the following valued of K0:
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Terzaghi’s experiment show that the value of K (empirical constant) varies from about ________ above the Centre of strip.
Unity
Zero
Less than unity
None of the mentioned
Explanation:
Terzaghi’s experiments show that the value of K varies from about unity (i.e., 1) immediately above the Centre of strip to a maximum of 1.5 at an approximate height above the strip.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The transfer of pressure from a yielding part of soil mass to the less yielding part is defined by the term __________
Arching
Projecting conduits
Stress transfer
None of the mentioned
Explanation:
Arching is defined as the phenomenon of the transfer of pressure from a yielding part of the soil mass to an adjoining less yielding or restrained part of the mass.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Ditch conduits are more commonly used in ___________
Sewers
High way
Railway culverts
All of the mentioned
Explanation:
Since narrow ditch can be installed in a narrow ditch below ground level, it is more commonly used as sewers, water mains etc.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
The problem of computing the stress in the vicinity of a cylindrical tunnel was solved by __________
Terzaghi
Mindlin
Biot
Rankine
Explanation:
The problem of computing the stress in the vicinity of a cylindrical tunnel corresponding to the state of elastic equilibrium has been solved more rigorously by Mindlin (1939), using the values of K0.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Underground conduits are commonly used for, which of the following purpose?
Sewers
Gas lines
Culverts
All of the mentioned
Explanation:
Underground conduits are commonly used as sewers, drains, and water mains, gas lines, culverts etc.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Underground conduits can be classified into ___________ types.
2
4
3
5
Explanation:
Based on the type of installations, conduits can be classified into 3 types:
Question 10
Marks : +2 | -2
Pass Ratio : 100%
A ditch conduits can be installed in a __________
Shallow bedding
Shallow ditch
Narrow ditch
All of the mentioned
Explanation:
A ditch conduit is the one which is installed in a narrow ditch, excavated in undistributed soil below ground level, which is then covered with earth backfill.