Geotechnical Engineering

Well Hydraulics

Question 1
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 2
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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 3
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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 4
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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 5
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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 6
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An open well has relatively larger diameter at __________
Base
Middle
Top
Near the bottom
Explanation:
As the velocity of water is larger at the base, the width of base widens up and its diameter increases.
Question 7
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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 8
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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 9
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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 10
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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