Geotechnical Engineering

Well Hydraulics

Question 1
Marks : +2 | -2
Pass Ratio : 100%
In most of the confined aquifers,the value of storage coefficient ranges between __________
0.05 to 0.0005
0.5 to 0.005
0.00005 to 0.005
0 to 5
Explanation:
By pumping test method, the value of storage coefficient ranges was found to be in between 0.00005 to 0.005.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following test is commonly adopted for determining soil permeability of soil formations?
Pumping-in test and Pumping-out test
Horizontal capillary test
None of the mentioned
All of the mentioned
Explanation:
Pumping-out test is the frequently used field method, as it involves discharging water from the ground.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
For fine-grained soil,the value of K/A as specified by Marrio is _________
1.00
0.50
0.25
2.00
Explanation:
For fine-grained type of soil, the value of K/A is 0.25 cubic meter per hour, per sq. m of the area under 1m depression head.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
In Recuperation test, the expression (K/A ) is known as ___________
Specific yield and Specific capacity
Coefficient of permeability
None of the mentioned
All of the mentioned
Explanation:
K/A is known as the specific yield or specific capacity of an open well, in cubic meter per hour per square meter of the area through which water percolates.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The parabolic depression in the aquifer is called as __________
Cone of depression and Drawdown curve
Parabolic curve
None of the mentioned
All of the mentioned
Explanation:
The parabolic depression formed when water is pumped from the aquifer through well can be called as cone of depression or the drawdown surface.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The value of specific yield SY, of an aquifer depends on ___________
Grain size
Compaction of stratum
Grain shape
All of the mentioned
Explanation:
Since specific yield is the volume of water drained, the drainage of water depend on grain size, shape and compaction of stratum in the soil.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Dupuit’s theory was later modified by _________
Thiem
Darcy
Alam Singh
Louden
Explanation:
The theory proposed by Dupuit’s on radial flow was modified by Thiem in 1906.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Volume of water dv entering the well, when the head recuperates by dh is ___________
dV=A/dh
dV=A.dh
dV=Khdt
dV=K.A
Explanation:
Volume of water entering the well, when the head recuperates by dh is given by the equation: dV=Adh
Question 9
Marks : +2 | -2
Pass Ratio : 100%
The co-efficient of transmissibility (T) of an aquifer is given by which of the following equation?
T=b k
T=b/k
T=(b k)2
T=k/b
Explanation:
The coefficient of transmissibility T is equals the field of co-efficient of permeability K multiplied by the aquifer thickness b:
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The discharge of an open well can be determined by, which of the following method?
Constant head test
Falling head test
Recuperation test
None of the mentioned
Explanation:
In the recuperation test, water level can be depressed to any level and the discharge from the well can be calculated.