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Recent questions and answers in Water Resources Engineering
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1
GATE2020CE112
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
asked
Feb 28, 2020
in
Hydraulics
by
jothee
(
2.7k
points)
gate2020ce1
hydraulics
waterresourcesengineering
0
votes
0
answers
2
GATE2020CE114
Uniform flow with velocity $U$ makes an angle $\theta$ with $y$axis, as shown in the figure The velocity potential $(\phi)$, is $\pm U(x\sin\theta+y\cos\theta)$ $\pm U(y\sin\thetax\cos\theta)$ $\pm U(x\sin\thetay\cos\theta)$ $\pm U(y\sin\theta+x\cos\theta)$
asked
Feb 28, 2020
in
Hydraulics
by
jothee
(
2.7k
points)
gate2020ce1
hydraulics
waterresourcesengineering
uniformflow
0
votes
0
answers
3
GATE2020CE115
The data for an agricultural field for a specific month are given below: ... $mm$) to be applied to the field in that month, is $0$ $20$ $40$ $80$
asked
Feb 28, 2020
in
Irrigation
by
jothee
(
2.7k
points)
gate2020ce1
irrigation
waterresourcesengineering
0
votes
0
answers
4
GATE2020CE116
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 $H^+$ $HOCl$ $Cl^$ $H_2O$
asked
Feb 28, 2020
in
Water Resources Engineering
by
jothee
(
2.7k
points)
gate2020ce1
chlorinationprocess
waterresourcesengineering
0
votes
0
answers
5
GATE2020CE117
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 $3.50$ $3.01$ $2.50$ $2.01$
asked
Feb 28, 2020
in
Water Resources Engineering
by
jothee
(
2.7k
points)
gate2020ce1
waterresourcesengineering
waterandwastewater
0
votes
0
answers
6
GATE2020CE124
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 ____________.
asked
Feb 28, 2020
in
Water Resources Engineering
by
jothee
(
2.7k
points)
gate2020ce1
waterresourcesengineering
flowmeasurementinchannels
numericalanswers
0
votes
0
answers
7
GATE2020CE136
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 $114.2\:kW$ $114.2\:MW$ $141.2\:h.p.$ $141.2\:J/s$
asked
Feb 28, 2020
in
Hydraulics
by
jothee
(
2.7k
points)
gate2020ce1
hydraulics
waterresourcesengineering
flowmeasurementinchannels
0
votes
0
answers
8
GATE2020CE137
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 $3.95$ $4.40$ $4.75$ $5.55$
asked
Feb 28, 2020
in
Fluid Mechanics
by
jothee
(
2.7k
points)
gate2020ce1
fluidmechanics
waterresourcesengineering
flowinpipes
0
votes
0
answers
9
GATE2020CE149
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 ______.
asked
Feb 28, 2020
in
Hydrology
by
jothee
(
2.7k
points)
gate2020ce1
hydrology
waterresourcesengineering
reservoirs
numericalanswers
0
votes
0
answers
10
GATE2020CE151
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 ______.
asked
Feb 28, 2020
in
Hydrology
by
jothee
(
2.7k
points)
gate2020ce1
hydrology
waterresourcesengineering
steadystate
numericalanswers
0
votes
0
answers
11
GATE2020CE152
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 ______.
asked
Feb 28, 2020
in
Water Resources Engineering
by
jothee
(
2.7k
points)
gate2020ce1
waterresourcesengineering
numericalanswers
0
votes
0
answers
12
GATE2020 CE212
Muskingum method is used in hydrologic reservoir routing hydrologic channel routing hydraulic channel routing hydraulic reservoir routing
asked
Feb 13, 2020
in
Hydrology
by
jothee
(
2.7k
points)
gate2020ce2
hydrology
hydraulics
waterresourcesengineering
muskingummethod
0
votes
0
answers
13
GATE2020 CE213
Superpassage is a canal crossdrainage 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
asked
Feb 13, 2020
in
Irrigation
by
jothee
(
2.7k
points)
gate2020ce2
irrigation
waterresourcesengineering
crossdrainagestructures
0
votes
0
answers
14
GATE2020 CE214
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 $2.00$ $3.24$ $5.40$ $6.48$
asked
Feb 13, 2020
in
Hydrology
by
jothee
(
2.7k
points)
gate2020ce2
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
15
GATE2020 CE215
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 $(5+6x)(9+6y) = \text{constant}$ $\dfrac{5+6x}{9+6y}= \text{constant}$ $(5+6x)(9+6y) = \text{constant}$ $\dfrac{9+6y}{5+6x}= \text{constant}$
asked
Feb 13, 2020
in
Water Resources Engineering
by
jothee
(
2.7k
points)
gate2020ce2
waterresourcesengineering
0
votes
0
answers
16
GATE2020 CE236
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 $7$ $10$ $11$ $13$
asked
Feb 13, 2020
in
Irrigation
by
jothee
(
2.7k
points)
gate2020ce2
irrigation
waterresourcesengineering
0
votes
0
answers
17
GATE2020 CE237
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 $130.4$ $100.0$ $50.0$ $65.2$
asked
Feb 13, 2020
in
Water Resources Engineering
by
jothee
(
2.7k
points)
gate2020ce2
waterresourcesengineering
alkalinityofwatersample
0
votes
0
answers
18
GATE2020 CE249
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 ________.
asked
Feb 13, 2020
in
Water Resources Engineering
by
jothee
(
2.7k
points)
gate2020ce2
numericalanswers
waterresourcesengineering
fluidmechanics
flowinpipes
0
votes
0
answers
19
GATE2020 CE250
A hydraulic jump occurs in a triangular $\text{(Vshaped)}$ 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 ________.
asked
Feb 13, 2020
in
Water Resources Engineering
by
jothee
(
2.7k
points)
gate2020ce2
numericalanswers
waterresourcesengineering
hydraulics
0
votes
0
answers
20
GATE2020 CE252
The ion product of water $(pK_w)$ is $14$. If a rain water sample has a $pH$ of $5.6$, the concentration of $OH^$ in the sample (in $10^{9}\: \text{mol/litre}$, round off to one decimal place), is ________.
asked
Feb 13, 2020
in
Water Resources Engineering
by
jothee
(
2.7k
points)
gate2020ce2
numericalanswers
waterresourcesengineering
0
votes
0
answers
21
GATE2017 CE27
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 $N_s = \dfrac{NQ^{0.5}}{H^{0.5}} \\$ $N_s = \dfrac{NQ^{0.5}}{H}\\$ $N_s = \dfrac{NQ^{0.5}}{H^{0.75}} \\$ $N_s = \dfrac{NQ}{H^{0.5}}$
asked
Aug 7, 2019
in
Hydraulics
by
gatecse
(
3.9k
points)
gate2017ce2
hydraulics
waterresourcesengineering
specificspeedofpumps
0
votes
0
answers
22
GATE2017 CE246
A $1$ m wide rectangular channel carries a discharge of $2 \: m^3 /s$. The specific energydepth diagram is prepared for the channel. It is observed in this diagram that corresponding to a particular specific energy, the subcritical depth is twice the supercritical depth. The subcritical depth (in meters, up to two decimal places) is equal to ________
asked
Aug 7, 2019
in
Water Resources Engineering
by
gatecse
(
3.9k
points)
gate2017ce2
numericalanswers
waterresourcesengineering
hydraulics
channelhydraulicsenergydepthrelationships
0
votes
0
answers
23
GATE2017 CE247
A catchment is idealized as a $25 \: km \times 25 \: km$ ... . The average precipitation (in mm, up to one decimal place) over the catchment during this month by using the Thiessen polygon method is ___________
asked
Aug 7, 2019
in
Hydrology
by
gatecse
(
3.9k
points)
gate2017ce2
numericalanswers
hydrology
waterresourcesengineering
precipitation
0
votes
0
answers
24
GATE2017 CE248
The culturable command area of a canal is $10.000$ ha. The area grows only two crops  rice in the Kharif season and wheat in the Rabi season. The design discharge of the canal is based on the rice requirements, which has an irrigated area of $2500$ ha, ... The maximum permissible irrigated area (in ha) for wheat, with a base period of $120$ days and delta of $50$ cm, is __________
asked
Aug 7, 2019
in
Irrigation
by
gatecse
(
3.9k
points)
gate2017ce2
numericalanswers
irrigation
waterresourcesengineering
designoflinedandunlinedcanals
0
votes
0
answers
25
GATE2017 CE249
Water is pumped at a steady uniform flow rate of $0.01 \: m^3/s$ through a horizontal smooth circular pipe of $100$ mm diameter. Given that the Reynolds number is $800$ and $g$ is $9.81 \: m/s^2$, the head loss (in meters, up to one decimal place) per km length due to friction would be _______
asked
Aug 7, 2019
in
Hydraulics
by
gatecse
(
3.9k
points)
gate2017ce2
numericalanswers
hydraulics
waterresourcesengineering
uniformflow
0
votes
0
answers
26
GATE2017 CE251
For a given water sample, the ratio between BOD$_{\text{5day, 20}^{\circ} C}$ and the ultimate BOD is $0.68$. The value of the reaction rate constant $k$ (on base $e$) (in day$^{1}$, up to two decimal places) is ________
asked
Aug 7, 2019
in
Water Resources Engineering
by
gatecse
(
3.9k
points)
gate2017ce2
numericalanswers
waterresourcesengineering
bod
0
votes
0
answers
27
GATE2017 CE252
A municipal corporation is required to treat $1000 \: m^3/day$ of water. It is found that an overflow rate of $20 m/day$ will produce a satisfactory removal of the discrete suspended particles at a depth of $3 m$. The diameter (in meters, round to the nearest integer) of a circular settling tank designed for the removal of these particles would be ___________
asked
Aug 7, 2019
in
Water Resources Engineering
by
gatecse
(
3.9k
points)
gate2017ce2
numericalanswers
municipalsolidwaste
waterresourcesengineering
0
votes
0
answers
28
GATE2017 CE253
The analysis of a water sample produces the following results: ... $CaCO_3$) of the water sample is _______
asked
Aug 7, 2019
in
Water Resources Engineering
by
gatecse
(
3.9k
points)
gate2017ce2
numericalanswers
waterresourcesengineering
0
votes
0
answers
29
GATE2019 CE1: 13
In a rectangular channel, the ratio of the velocity head to the flow depth for critical flow condition, is $\dfrac{1}{2}\\$ $\dfrac{2}{3} \\$ $\dfrac{3}{2} \\$ $2$
asked
Feb 14, 2019
in
Hydraulics
by
Arjun
(
2.8k
points)
gate2019ce1
flowmeasurementinchannels
hydraulics
waterresourcesengineering
0
votes
0
answers
30
GATE2019 CE1: 14
If the path of an irrigation canal is below the bed level of a natural stream, the type of crossdrainage structure provided is Aqueduct Level crossing Sluice gate Super passage
asked
Feb 14, 2019
in
Water Resources Engineering
by
Arjun
(
2.8k
points)
gate2019ce1
irrgation
waterresourcesengineering
crossdrainagestructures
0
votes
0
answers
31
GATE2019 CE1: 15
A catchment may be idealised as a rectangle. There are three rain gauges located inside the catchment at arbitrary locations. The average precipitation over the catchment is estimated by two methods: Arithmetic mean $(P_A)$ Thiessen polygon $(P_T)$ Which one of the ... greater than $P_T$ $P_A$ is always equal to $P_T$ There is no definite relationship between $P_A$ and $P_T$
asked
Feb 14, 2019
in
Water Resources Engineering
by
Arjun
(
2.8k
points)
gate2019ce1
waterresourcesengineering
hydrology
precipitation
0
votes
0
answers
32
GATE2019 CE1: 22
A circular duct carrying water gradually contracts from a diameter of $30 \: cm$ to $15 \: cm$. The figure (not drawn to scale) shows the arrangement to differential manometer attached to the duct. When the water flows, the differential manometer shows a ... Assuming frictionless flow, the flow rate (in $m^3/s$, round off to $3$ decimal places) through the duct is ________
asked
Feb 14, 2019
in
Water Resources Engineering
by
Arjun
(
2.8k
points)
gate2019ce1
numericalanswers
waterresourcesengineering
manometer
0
votes
0
answers
33
GATE2019 CE1: 28
A rectangular open channel has a width of $5 \: m$ and a bed slope of $0.001$. For a uniform flow of depth $2 \: m$, the velocity is $2 \: m/s$. The Manning’s roughness coefficient for the channel is $0.002$ $0.017$ $0.033$ $0.050$
asked
Feb 14, 2019
in
Water Resources Engineering
by
Arjun
(
2.8k
points)
gate2019ce1
waterresourcesengineering
manning'sroughnesscoefficient
0
votes
0
answers
34
GATE2019 CE1: 49
The hyetograph of a storm event of duration $140$ minutes is shown in the figure: The infiltration capacity at the start of this event $(t=0)$ is $17 \: mm/hour$, which linearly decreases to $10 \: mm/hour$ after $40$ minutes duration. As the event ... of the storm event. The value of the infiltration index, $\phi$ (in $mm/hour$ round off to $2$ decimal places), is _____________
asked
Feb 14, 2019
in
Water Resources Engineering
by
Arjun
(
2.8k
points)
gate2019ce1
numericalanswers
waterresourcesengineering
hydrology
infiltration
0
votes
0
answers
35
GATE2019 CE1: 50
Two water reservoirs are connected by a siphon (running full) of total length $5000$ m and diameter of $1.10$ m, as shown below (figure not drawn to scale). The inlet leg length of the siphon to its summit is $2000$ m. The difference in the water surface ... of the summit of siphon from the water level of upper reservoir, $h$ (in m, round off to $1$ decimal place) is ______
asked
Feb 14, 2019
in
Hydrology
by
Arjun
(
2.8k
points)
gate2019ce1
numericalanswers
hydrology
waterresourcesengineering
reservoirs
0
votes
0
answers
36
GATE2019 CE1: 51
Consider a laminar flow in the xdirection between two infinite parallel plates (Couette flow). The lower plate is stationary and the upper plate is moving with a velocity of $1 \: cm/s$ in the xdirection. The distance between the plates is $5 \: mm$ and the dynamic viscosity ... $\dfrac {\partial p}{\partial x}$, (in $N/m^2$ per $m$, round off to $1$ decimal place) is _________
asked
Feb 14, 2019
in
Fluid Mechanics
by
Arjun
(
2.8k
points)
gate2019ce1
numericalanswers
fluidmechanics
waterresourcesengineering
laminarflow
0
votes
0
answers
37
GATE2019 CE2: 12
A solid sphere of radius, $r$, and made of material with density, $\rho_s$, is moving through the atmosphere (constant pressure, $p$) with a velocity, $v$. The net force ONLY due to atmospheric pressure $(F_p)$ acting on the sphere at any time, $t$, is $\pi r^2 p$ $4 \pi r^2 p$ $\dfrac{4}{3} \pi r^3 \rho_s \dfrac{dv}{dt}$ zero
asked
Feb 12, 2019
in
Water Resources Engineering
by
Arjun
(
2.8k
points)
gate2019ce2
waterresourcesengineering
0
votes
0
answers
38
GATE2019 CE2: 13
The velocity field in a flow system is given by $v=2\textbf{i}+(x+y) \textbf{j} + (xyz) \textbf{k}$. The acceleration of the fluid at $(1,1,2)$ is $2 \textbf{i}+ 10 \textbf{k}$ $4 \textbf{i}+ 12 \textbf{k}$ $ \textbf{j}+ \textbf{k}$ $4 \textbf{j}+ 10 \textbf{k}$
asked
Feb 12, 2019
in
Water Resources Engineering
by
Arjun
(
2.8k
points)
gate2019ce2
waterresourcesengineering
fluidmechanics
0
votes
0
answers
39
GATE2019 CE2: 14
An inflow hydrograph is routed through a reservoir to produce an outflow hydrograph. The peak flow of the inflow hydrograph is $P_I$ and the time of occurrence of the peak is $t_I$. The peak flow of the outflow hydrograph is $P_O$ and the time of occurrence of the peak is $t_O$. ... $P_I <P_O$ and $t_I > t_O$ $P_I >P_O$ and $t_I < t_O$ $P_I >P_O$ and $t_I > t_O$
asked
Feb 12, 2019
in
Hydrology
by
Arjun
(
2.8k
points)
gate2019ce2
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
40
GATE2019 CE2: 15
An earthen dam of height $H$ is made of cohesive soil whose cohesion and unit weight arc $c$ and $\gamma$ respectively. If the factor of safety against cohesion is $F_c$, the Taylor’s stability number $(S_n)$ is $\dfrac{\gamma H}{cF_c} \\$ $\dfrac{cF_c}{\gamma H} \\$ $\dfrac{c}{F_c \gamma H} \\$ $\dfrac{F_c \gamma H}{c}$
asked
Feb 12, 2019
in
Water Resources Engineering
by
Arjun
(
2.8k
points)
gate2019ce2
waterresourcesengineering
irrigation
dams
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