Geotechnical Engineering

Well Hydraulics

Question 1
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 2
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 3
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.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The type of hydraulics of flows towards open well is __________
Radial flow
Bottom flow
Adjacent flow
All of the mentioned
Explanation:
If the well is open, radial flow takes place all around the well and there is no flow from the bottom of the well.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
According to Dupuit’s theory,the velocity of flow is proportional to__________
Sine of hydraulic gradient
Tangent of hydraulic gradient
None of the mentioned
All of the mentioned
Explanation:
Based on the assumption proposed by Dupuit’s theory, the velocity of flow is proportional to the tangent of the hydraulic agent instead of its sine.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The pumping-in test was devised by _________
U.S. Bureau of soil and PRA
U.S. Bureau of reclamation
Indian standard of Bureau
None of the mentioned
Explanation:
The U.S. bureau of Reclamation (Earth Manual, 1960) has devised two types of pumping-in test.
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%
Which of the following flow is less efficient than radial flow?
Bottom flow
Spherical flow
Turbulent flow
Linear flow
Explanation:
The discharge of spherical flow qs is given by, qs/q =2.3(r/b) log10 1000
Question 9
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 10
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.