Geotechnical Engineering

Well Hydraulics

Question 1
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 2
Marks : +2 | -2
Pass Ratio : 100%
Specific yield of unconfined aquifer indicates __________
Water capacity
Volume of water
Water retained
All of the mentioned
Explanation:
Specific yield is an indication of the water yielding capacity of an unconfined aquifer.
Question 3
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 4
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is depicted by Dupuit’s theory?
The velocity of flow
Co-efficient of transmissibility
Radial flow of water
Volume of aquifer
Explanation:
The analysis of the radial flow of water to a well was originally proposed by Dupuit’s theory.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Dupuit’s theory states that, the Darcy’s law equation is not valid near_________
Well face
Top Surface of well
Sides of the well
All of the mentioned
Explanation:
Since the flow of water is not horizontal near wall and the flow no longer remains laminar. Thus, Darcy’s law equation is not valid near the well face.
Question 6
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 7
Marks : +2 | -2
Pass Ratio : 100%
When two wells, situated near each other is discharged,the total discharge will __________
Increases
Decreases
Remains the same
None of the mentioned
Explanation:
When two wells are discharged, their drawdown curves intersect within their radii of zero drawdown. Thus the total discharge is increased.
Question 8
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 9
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 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.