Geotechnical Engineering

Well Hydraulics

Question 1
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 2
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 3
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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 4
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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 5
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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%
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 7
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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 8
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Pass Ratio : 100%
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 9
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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 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.