Engineering Questions with Answers - Multiple Choice Questions
Well Hydraulics – Dupuits Theory
1 - Question
Which of the following test is commonly adopted for determining soil permeability of soil formations?
a) Pumping-in test and Pumping-out test
b) Horizontal capillary test
c) None of the mentioned
d) All of the mentioned
View Answer
Explanation: Pumping-out test is the frequently used field method, as it involves discharging water from the ground.
2 - Question
The value of specific yield SY, of an aquifer depends on ___________
a) Grain size
b) Compaction of stratum
c) Grain shape
d) All of the mentioned
View Answer
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.
3 - Question
Specific yield of unconfined aquifer indicates __________
a) Water capacity
b) Volume of water
c) Water retained
d) All of the mentioned
View Answer
Explanation: Specific yield is an indication of the water yielding capacity of an unconfined aquifer.
4 - Question
Dupuit’s theory was later modified by _________
a) Thiem
b) Darcy
c) Alam Singh
d) Louden
View Answer
Explanation: The theory proposed by Dupuit’s on radial flow was modified by Thiem in 1906.
5 - Question
The parabolic depression in the aquifer is called as __________
a) Cone of depression and Drawdown curve
b) Parabolic curve
c) None of the mentioned
d) All of the mentioned
View Answer
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.
6 - Question
In most of the confined aquifers,the value of storage coefficient ranges between __________
a) 0.05 to 0.0005
b) 0.5 to 0.005
c) 0.00005 to 0.005
d) 0 to 5
View Answer
Explanation: By pumping test method, the value of storage coefficient ranges was found to be in between 0.00005 to 0.005.
7 - Question
Which of the following is depicted by Dupuit’s theory?
a) The velocity of flow
b) Co-efficient of transmissibility
c) Radial flow of water
d) Volume of aquifer
View Answer
Explanation: The analysis of the radial flow of water to a well was originally proposed by Dupuit’s theory.
8 - Question
The co-efficient of transmissibility (T) of an aquifer is given by which of the following equation?
a) T=b k
b) T=b/k
c) T=(b k)2
d) T=k/b
View Answer
Explanation: The coefficient of transmissibility T is equals the field of co-efficient of permeability K multiplied by the aquifer thickness b: T=b k.
9 - Question
According to Dupuit’s theory,the velocity of flow is proportional to________
a) Sine of hydraulic gradient
b) Tangent of hydraulic gradient
c) None of the mentioned
d) All of the mentioned
View Answer
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.
10 - Question
Dupuit’s theory states that, the Darcy’s law equation is not valid near________
_ a) Well face
b) Top Surface of well
c) Sides of the well
d) All of the mentioned
View Answer
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.