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Recent questions and answers in Water Resources Engineering
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1
GATE Civil 2021 Set 2 | Question: 12
The ratio of the momentum correction factor to the energy correction factor for a laminar flow in a pipe is $\frac{1}{2}$ $\frac{2}{3}$ $1$ $\frac{3}{2}$
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Fluid Mechanics
Mar 1, 2021
by
go_editor
5.3k
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gatecivil-2021-set2
flow-in-pipes
laminar-flow
0
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0
answers
2
GATE Civil 2021 Set 2 | Question: 22
A $12$-hour unit hydrograph (of $\text{1 cm}$ excess rainfall) of a catchment is of a triangular shape with a base width of $144$ hour and a peak discharge of $23\text{ m}^3\text{/s}$. The area of the catchment (in $\text{km}^2, \textit{round off to the nearest integer}$) is _____________
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in
Hydrology
Mar 1, 2021
by
go_editor
5.3k
points
gatecivil-2021-set2
numerical-answers
surface-runoff-models
rainfall
0
votes
0
answers
3
GATE Civil 2021 Set 2 | Question: 23
A lake has a maximum depth of $\text{60 m}$. If the mean atmospheric pressure in the lake region is $\text{91 kPa}$ and the unit weight of the lake water is $\text{9790 N/m}^{3}$, the absolute pressure (in $\text{kPa}, \textit{round off to two decimal places}$) at the maximum depth of the lake is ___________________
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in
Fluid Mechanics
Mar 1, 2021
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go_editor
5.3k
points
gatecivil-2021-set2
numerical-answers
momentum-and-energy-equations
fluid-statics
0
votes
0
answers
4
GATE Civil 2021 Set 2 | Question: 31
A rectangular open channel of $\text{6 m}$ width is carrying a discharge of $20 \text{ m$^{3}$/s}$. Consider the acceleration due to gravity as $ ... the given discharge will then be $\text{0.82 m}$ $\text{1.04 m}$ $\text{2.56 m}$ $\text{3.18 m}$
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Hydraulics
Mar 1, 2021
by
go_editor
5.3k
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gatecivil-2021-set2
flow-measurement-in-channels
rectangular-channels
0
votes
0
answers
5
GATE Civil 2021 Set 2 | Question: 33
A water filtration unit is made of uniform-size sand particles of $\text{0.4 mm}$ diameter with a shape factor of $0.84$ and specific gravity of $2.55$. The depth of the filter bed is $\text{0.70 m}$ and the porosity is $0.35$. The filter bed is to be expanded to a ... $6.35 \times 10^{-3}\text{ m/s}$ $0.69 \text{ cm/s}$ $0.75 \text{ cm/s}$
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Hydrology
Mar 1, 2021
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go_editor
5.3k
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gatecivil-2021-set2
infiltration
0
votes
0
answers
6
GATE Civil 2021 Set 2 | Question: 40
A fire hose nozzle directs a steady stream of water of velocity $\text{50 m/s}$ at an angle of $45^{\circ}$ above the horizontal. The stream rises initially but then eventually falls to the ground. Assume water as incompressible and ... ) reached by the stream above the hose nozzle will then be __________
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Fluid Mechanics
Mar 1, 2021
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go_editor
5.3k
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gatecivil-2021-set2
numerical-answers
properties-of-fluids
fluid-statics
0
votes
0
answers
7
GATE Civil 2021 Set 2 | Question: 48
The hyetograph in the figure corresponds to a rainfall event of $\text{3 cm}$. If the rainfall event has produced a direct runoff of $\text{1.6 cm}$, the $\phi$-index of the event (in $\text{mm/hour},\textit{round off to one decimal place}$) would be
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Hydrology
Mar 1, 2021
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go_editor
5.3k
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gatecivil-2021-set2
numerical-answers
surface-runoff-models
0
votes
0
answers
8
GATE Civil 2021 Set 2 | Question: 49
A venturimeter as shown in the figure (not to scale) is connected to measure the flow of water in a vertical pipe of $\text{20 cm}$ diameter. Assume $g=9.8\text{ m/s}^{2}$ ... $\text{lps}$, round off to two decimal places) considering no loss in the venturimeter is ______________________
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Fluid Mechanics
Mar 1, 2021
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go_editor
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gatecivil-2021-set2
numerical-answers
flow-in-pipes
0
votes
0
answers
9
GATE Civil 2021 Set 2 | Question: 50
A reservoir with a live storage of $300$ million cubic metre irrigates $40000$ hectares ( $1$ hectare= $10^{4}\text{ m}^{2}$) of a crop with two fillings of the reservoir. If the base period of the crop is $120$ days, the duty for this crop (in hectares per cumec, $\textit{round off to integer}$) will then be _________
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Irrigation
Mar 1, 2021
by
go_editor
5.3k
points
gatecivil-2021-set2
numerical-answers
canals
canals-irrigation-system
0
votes
0
answers
10
GATE Civil 2021 Set 1 | Question: 9
If water is flowing at the same depth in most hydraulically efficient triangular and rectangular channel sections then the ratio of hydraulic radius of triangular section to that of rectangular section is $\frac{1}{\sqrt{2}}$ $\sqrt{2}$ $1$ $2$
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Hydraulics
Feb 20, 2021
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Arjun
11.6k
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gatecivil-2021-set1
flow-measurements-channels
triangular-rectangular-hydraulics
0
votes
0
answers
11
GATE Civil 2021 Set 1 | Question: 10
‘Kinematic viscosity’ is dimensionally represented as $\frac{M}{LT}$ $\frac{M}{L^{2}T}$ $\frac{T^{2}}{L}$ $\frac{L^{2}}{T}$
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Fluid Mechanics
Feb 20, 2021
by
Arjun
11.6k
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gatecivil-2021-set1
kinematic-viscosity
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0
answers
12
GATE Civil 2021 Set 1 | Question: 24
Two reservoirs are connected through a homogeneous and isotropic aquifer having hydraulic conductivity $\text{(K)}$ of $25$ $\text{m}$/day and effective porosity $\left ( \eta \right )$ of $0.3$ as shown in the figure (not to scale ... , $\textit{round off to one decimal place}$) taken by the contaminated water to reach to Reservoir $2$ will be _______________
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Hydrology
Feb 20, 2021
by
Arjun
11.6k
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gatecivil-2021-set1
numerical-answers
hydraulics-and-acquifers
reservoirs
0
votes
0
answers
13
GATE Civil 2021 Set 1 | Question: 32
A fluid flowing steadily in a circular pipe of radius $\text{R}$ has a velocity that is everywhere parallel to the axis (centerline) of the pipe. The velocity distribution along the radial direction is $V_{r}=U\left ( 1-\dfrac{r^{2}}{R^{2}} \right )$, where $\text{r}$ ... fluid in the pipe is $\frac{U}{2}$ $\frac{U}{3}$ $\frac{U}{4}$ $\left(\frac{5}{6}\right)U$
Arjun
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in
Hydraulics
Feb 20, 2021
by
Arjun
11.6k
points
gatecivil-2021-set1
flow-measurement-in-pipe
0
votes
0
answers
14
GATE Civil 2021 Set 1 | Question: 48
An unlined canal under regime conditions along with a silt factor of $1$ has a width of flow $71.25 \;\text{m}$. Assuming the unlined canal as a wide channel, the corresponding average depth of flow (in $\text{m}$, $\textit{round off to two decimal places}$) in the canal will be __________________
Arjun
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in
Irrigation
Feb 20, 2021
by
Arjun
11.6k
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gatecivil-2021-set1
numerical-answers
lined-and-unlined-canals
unlined-canals
0
votes
0
answers
15
GATE Civil 2021 Set 1 | Question: 49
A cylinder $\text{(2.0 m diameter, 3.0 m long and 25 kN weight)}$ is acted upon by water on one side and oil $\text{(specific gravity=0.8)}$ on other side as shown in the figure. The absolute ratio of the net magnitude of vertical forces to the net magnitude of horizontal forces ($\textit{round off to two decimal places}$) is _____________________
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Fluid Mechanics
Feb 20, 2021
by
Arjun
11.6k
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gatecivil-2021-set1
numerical-answers
properties-of-fluids
fluid-statics
0
votes
0
answers
16
GATE Civil 2021 Set 1 | Question: 50
A tube-well of $20\text{ cm}$ diameter fully penetrates a horizontal, homogeneous and isotropic confined aquifer of infinite horizontal extent. The aquifer is of $30 \text{ m}$ ... $\text{m/day}, \textit{round off to integer}$) is ________________
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in
Hydrology
Feb 20, 2021
by
Arjun
11.6k
points
gatecivil-2021-set1
numerical-answers
ground-water-hydrology
hydraulics-and-acquifers
0
votes
0
answers
17
GATE2020-CE-1-12
Velocity of flow is proportional to the first power of hydraulic gradient in Darcy’s law. This law is applicable to laminar flow in porous media transitional flow in porous media turbulent flow in porous media laminar as well as turbulent flow in porous media
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Fluid Mechanics
Feb 28, 2020
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go_editor
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gate2020-ce-1
laminar-and-turbulent-flow
0
votes
0
answers
18
GATE2020-CE-1-14
Uniform flow with velocity $U$ makes an angle $\theta$ with $y$-axis, as shown in the figure The velocity potential $(\phi)$, is $\pm U(x\sin\theta+y\cos\theta)$ $\pm U(y\sin\theta-x\cos\theta)$ $\pm U(x\sin\theta-y\cos\theta)$ $\pm U(y\sin\theta+x\cos\theta)$
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in
Hydraulics
Feb 28, 2020
by
go_editor
5.3k
points
gate2020-ce-1
uniform-flow
0
votes
0
answers
19
GATE2020-CE-1-15
The data for an agricultural field for a specific month are given below: ... $mm$) to be applied to the field in that month, is $0$ $20$ $40$ $80$
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asked
in
Hydrology
Feb 28, 2020
by
go_editor
5.3k
points
gate2020-ce-1
crop-water-requirements
0
votes
0
answers
20
GATE2020-CE-1-16
During chlorination process, aqueous (aq) chlorine reacts rapidly with water to form $Cl^-,HOCl$, and $H^+$ as shown below $Cl_2(aq)+H_2O\:{\large\rightleftharpoons}\:HOCl+Cl^-+H^+$ The most active disinfectant in the chlorination process from amongst the following, is $H^+$ $HOCl$ $Cl^-$ $H_2O$
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in
Hydrology
Feb 28, 2020
by
go_editor
5.3k
points
gate2020-ce-1
chlorination-process
hydrograph-analysis
0
votes
0
answers
21
GATE2020-CE-1-17
An amount of $35.67\:mg\:HCl$ is added to distilled water and the total solution volume is made to one litre. The atomic weights of $H$ and $Cl$ are $1$ and $35.5$, respectively. Neglecting the dissociation of water, the pH of the solution, is $3.50$ $3.01$ $2.50$ $2.01$
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in
Water Resources Engineering
Feb 28, 2020
by
go_editor
5.3k
points
gate2020-ce-1
water-resources-engineering
water-and-waste-water
0
votes
0
answers
22
GATE2020-CE-1-24
A $4\:m$ wide rectangular channel carries $6\:m^3/s$ of water. The Manning’s ‘$n$’ of the open channel is $0.02$. Considering $g=9.81\:m/s^2$, the critical velocity of flow (in $m/s$, round off to two decimal places ) in the channel, is ____________.
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in
Hydraulics
Feb 28, 2020
by
go_editor
5.3k
points
gate2020-ce-1
flow-measurement-in-channels
numerical-answers
0
votes
0
answers
23
GATE2020-CE-1-36
Water flows at the rate of $12\:m^3/s$ in a $6\:m$ wide rectangular channel. A hydraulic jump is formed in the channel at a point where the upstream depth is $30\:cm$ (just before the jump). Considering acceleration due to gravity as $9.81\:m/s^2$ and density of water as $1000\:kg/m^3$, the energy loss in the jump is $114.2\:kW$ $114.2\:MW$ $141.2\:h.p.$ $141.2\:J/s$
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in
Hydraulics
Feb 28, 2020
by
go_editor
5.3k
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gate2020-ce-1
hydraulics
water-resources-engineering
flow-measurement-in-channels
0
votes
0
answers
24
GATE2020-CE-1-37
A water supply scheme transports $10\:MLD$ (MIllion Litres per Day) water through a $450\:mm$ diameter pipeline for a distance of $2.5\:km$. A chlorine dose of $3.50\:mg/litre$ is applied at the starting point of the pipeline to attain a certain level of disinfection at ... the chlorine dose (in $mg/litre$) to be applied at the starting point should be $3.95$ $4.40$ $4.75$ $5.55$
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in
Fluid Mechanics
Feb 28, 2020
by
go_editor
5.3k
points
gate2020-ce-1
fluid-mechanics
water-resources-engineering
flow-in-pipes
0
votes
0
answers
25
GATE2020-CE-1-49
Three reservoirs $P,Q$ and $R$ are interconnected by pipes as shown in the figure (not drawn to the scale). Piezometric head at the junction $S$ of the pipes is $100\:m$. Assume acceleration due to gravity as $9.81\:m/s^2$ ... height of water level in the lowermost reservoir $R$ (in $m$, round off to one decimal place) with respect to the datum, is ______.
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in
Hydrology
Feb 28, 2020
by
go_editor
5.3k
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gate2020-ce-1
numerical-answers
reservoir
friction-loss
0
votes
0
answers
26
GATE2020-CE-1-51
A circular water tank of $2\:m$ diameter has a circular orifice of diameter $0.1\:m$ at the bottom. Water enters the tank steadily at a flow rate of $20\:litre/s$ and escapes through the orifice. The coefficient of discharge of the orifice is $0.8$. ... losses. The height of the water level (in $m$, round off to two decimal places) in the tank at the steady state, is ______.
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in
Hydraulics
Feb 28, 2020
by
go_editor
5.3k
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gate2020-ce-1
numerical-answers
friction-loss
flow-measurements
0
votes
0
answers
27
GATE2020-CE-1-52
Surface Overflow Rate (SOR) of a primary settling tank (discrete settling) is $20000\:litre/m^2$ per day. Kinematic viscosity of water in the tank is $1.01\times10^{-2}\:cm^2/s$. Specific gravity of the settling particles is $2.64$. Acceleration due to ... $80\%$ efficiency in the tank, is ______.
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in
Fluid Mechanics
Feb 28, 2020
by
go_editor
5.3k
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gate2020-ce-1
numerical-answers
flow-in-pipes
flow-measurements
0
votes
0
answers
28
GATE2020 CE-2-12
Muskingum method is used in hydrologic reservoir routing hydrologic channel routing hydraulic channel routing hydraulic reservoir routing
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Hydrology
Feb 13, 2020
by
go_editor
5.3k
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gate2020-ce-2
hydrology
hydraulics
water-resources-engineering
muskingum-method
0
votes
0
answers
29
GATE2020 CE-2-13
Superpassage is a canal cross-drainage structure in which natural stream water flows with free surface below a canal natural stream water flows under pressure below a canal canal water flows with free surface below a natural stream canal water flows under pressure below a natural stream
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Irrigation
Feb 13, 2020
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go_editor
5.3k
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gate2020-ce-2
irrigation
water-resources-engineering
cross-drainage-structures
canals
0
votes
0
answers
30
GATE2020 CE-2-14
A triangular direct runoff hydrograph due to a storm has a time base of $90$ hours. The peak flow of $60\: m^3/s$ occurs at $20$ hours from the start of the storm. The area of catchment is $300\: km^2$. The rainfall excess of the storm (in cm), is $2.00$ $3.24$ $5.40$ $6.48$
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Hydrology
Feb 13, 2020
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go_editor
5.3k
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gate2020-ce-2
hydrology
water-resources-engineering
hydrographs
surface-runoff-models
0
votes
0
answers
31
GATE2020 CE-2-15
The velocity components in the $x$ and $y$ directions for an incompressible flow are given as $u = (-5 + 6x)$ and $v = -(9+6y)$, respectively. The equation of the streamline is $(-5+6x)-(9+6y) = \text{constant}$ $\dfrac{-5+6x}{9+6y}= \text{constant}$ $(-5+6x)(9+6y) = \text{constant}$ $\dfrac{9+6y}{-5+6x}= \text{constant}$
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Fluid Mechanics
Feb 13, 2020
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go_editor
5.3k
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gate2020-ce-2
water-resources-engineering
flow-in-pipes
incompressible-flow
0
votes
0
answers
32
GATE2020 CE-2-25
Two identically sized primary settling tanks receive water for $\text{Type-I}$ settling (discrete particles in dilute suspension) under laminar flow conditions. The Surface Overflow Rate (SOR) maintained in the two tanks are $30\ m^3/m^2.d$ and $15\: m^3/m^2.d$. ... $d_{15}$ respectively. The ratio, $\large \dfrac{d_{30}}{d_{15}}$ (round off to two decimal places), is ________.
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Fluid Mechanics
Feb 13, 2020
by
go_editor
5.3k
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gate2020-ce-2
numerical-answers
laminar-flow
0
votes
0
answers
33
GATE2020 CE-2-36
Crops are grown in a field having soil, which has field capacity of $30\%$ and permanent wilting point of $13\%.$ The effective depth of root zone is $80\ cm$. Irrigation water is supplied when the average soil moisture drops to $20\%.$ ... of water for the crops is $2\ mm$, the frequency of irrigating the crops (in days), is $7$ $10$ $11$ $13$
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Irrigation
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go_editor
5.3k
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gate2020-ce-2
irrigation
crop-water-requirements
0
votes
0
answers
34
GATE2020 CE-2-37
Alkalinity of water, in equivalent/litre (eq/litre), is given by ${\{HC{O_3}^-}\} + 2{\{C{O_3}^{2-}}\} + {\{OH^-\}}\ -\ {\{H^+\}}$ where, $\{\ \ \}$ represents concentration in $\text{mol/litre}$ ... and $H^+$ are NEGLECTED, the alkalinity of the water sample $\text{(in mg/litre as}\: CaCO_3),$ is $130.4$ $100.0$ $50.0$ $65.2$
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Water Resources Engineering
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go_editor
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gate2020-ce-2
water-resources-engineering
alkalinity-of-water-sample
0
votes
0
answers
35
GATE2020 CE-2-49
A cast iron pipe of diameter $600\: mm$ and length $400\: m$ carries water from a tank and discharges freely into air at a point $4.5\: m$ below the water surface in the tank. The friction factor of the pipe is $0.018$. Consider acceleration due to gravity as $9.81\: m/s^2$. The velocity of the flow in pipe (in $m/s$, round off to two decimal places) is ________.
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Fluid Mechanics
Feb 13, 2020
by
go_editor
5.3k
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gate2020-ce-2
numerical-answers
flow-in-pipes
0
votes
0
answers
36
GATE2020 CE-2-50
A hydraulic jump occurs in a triangular $\text{(V-shaped)}$ channel with side slopes $1:1$ (vertical to horizontal). The sequent depths are $0.5\: m$ and $1.5\: m$. The flow rate (in $m^3/s$, round off to two decimal places) in the channel is ________.
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Hydraulics
Feb 13, 2020
by
go_editor
5.3k
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gate2020-ce-2
numerical-answers
hydraulic-jump
0
votes
0
answers
37
GATE2017 CE-2-7
If a centrifugal pump has an impeller speed of $N$ (in rpm), discharge $Q$ (in $m^3/s$) and the total head $H$ (in $m$), the expression for the specific speed $N_s$ of the pump is given by $N_s = \dfrac{NQ^{0.5}}{H^{0.5}} \\$ $N_s = \dfrac{NQ^{0.5}}{H}\\$ $N_s = \dfrac{NQ^{0.5}}{H^{0.75}} \\$ $N_s = \dfrac{NQ}{H^{0.5}}$
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Hydraulics
Aug 7, 2019
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gatecse
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gate2017-ce-2
hydraulics
water-resources-engineering
specific-speed-of-pumps
0
votes
0
answers
38
GATE2017 CE-2-23
During a storm event in a certain period, the rainfall intensity is $3.5$ cm/hour and the $\Phi$-index is $1.5$ cm/hour. The intensity of effective rainfall (in cm/hour, up to one decimal place) for this period is ________
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Hydrology
Aug 7, 2019
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gatecse
4.0k
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gate2017-ce-2
numerical-answers
water-resources-engineering
hydrology
hydrographs
surface-runoff-models
0
votes
0
answers
39
GATE2017 CE-2-24
The infiltration capacity of a soil follows the Horton's exponential model, $f=c_1+c_2e^{-kt}$. During an experiment, the initial infiltration capacity was observed to be $200$ mm/h. After a long time, the infiltration capacity was reduced $25$ mm/h. If the filtration capacity ... $k$ (in $h^{-1}$, up to two decimal places) is ________
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Hydrology
Aug 7, 2019
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gatecse
4.0k
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gate2017-ce-2
numerical-answers
water-resources-engineering
hydrology
infiltration
0
votes
0
answers
40
GATE2017 CE-2-45
The figure shows a U-tube having a $5 \: mm \times 5 mm$ square cross-section filled with mercury (specific gravity $13.6$) up to a height of $20 $ cm in each limb (open to atmosphere) If $5 \: cm^3$ of water is added to the right limb, the new height (in cm, up to two decimal places) of mercury in the LEFT limb will be ________
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Fluid Mechanics
Aug 7, 2019
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gatecse
4.0k
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gate2017-ce-2
numerical-answers
water-resources-engineering
fluid-mechanics
fluid-statics
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