IES/ESE Paper (Civil) Mains Paper - II - 2024 | GATE, ISRO & IES/ESE Previous Year Solved Papers - Mechanical Engineering PDF Download

 Page 1


1 
Time Allowed: Three Hours 
CIVIL ENGINEERING 
PAPER-II 
oUESTION PAPER SPECIFIC INSTRUCTIONS 
There are EIGHT questions divided in TWO Sections. 
Please read each of the following instructions carefully 
before attempting questions 
Candidate has to attempt FIVE questions in all. 
SGSE-T-CVL 
Maximum Marks : 300 
Question Nos. 1 and 5 are compulsory and out of the remaining, THREE are to be 
attempted choosing at least ONE question from each Section. 
The number of marks carried by a question/ part is indicated against it. 
Wherever any assumptions are made for answering a question, they must be clearly 
indicated. 
Diagrams/Figures, wherever required, shall be drawn in the space provided for answering 
the questions itself. 
SGSE T-CVL/69 
Unless otherwise mentioned, symbols and notations have their usual standard meanings. 
Attempts of questions shall be counted in sequential order. Unless struck off, attempt of a 
question shall be 
counted even if 
attempted party. 
Answers must be written in ENGLISH only. 
Any page or portion of the page left blank in the Question-cum-Answer (QCA) Booklet 
must be clearly struck off. 
1 
[P.T.O. 
UPSC ESE Mains 2024 Civil Engineering Question Paper 23 June 2024
Page 2


1 
Time Allowed: Three Hours 
CIVIL ENGINEERING 
PAPER-II 
oUESTION PAPER SPECIFIC INSTRUCTIONS 
There are EIGHT questions divided in TWO Sections. 
Please read each of the following instructions carefully 
before attempting questions 
Candidate has to attempt FIVE questions in all. 
SGSE-T-CVL 
Maximum Marks : 300 
Question Nos. 1 and 5 are compulsory and out of the remaining, THREE are to be 
attempted choosing at least ONE question from each Section. 
The number of marks carried by a question/ part is indicated against it. 
Wherever any assumptions are made for answering a question, they must be clearly 
indicated. 
Diagrams/Figures, wherever required, shall be drawn in the space provided for answering 
the questions itself. 
SGSE T-CVL/69 
Unless otherwise mentioned, symbols and notations have their usual standard meanings. 
Attempts of questions shall be counted in sequential order. Unless struck off, attempt of a 
question shall be 
counted even if 
attempted party. 
Answers must be written in ENGLISH only. 
Any page or portion of the page left blank in the Question-cum-Answer (QCA) Booklet 
must be clearly struck off. 
1 
[P.T.O. 
UPSC ESE Mains 2024 Civil Engineering Question Paper 23 June 2024
1. 
(a) A 
rectangular plate of 0-50 m x 050 m 
dimensions and weighing 500 N slides 
down an inclined plane making 30 angle with the horizontal. The velocity of 
the plate is 175 m/s. If the 2 mm gap between the plate and the inclined 
surface is filled with lubricating oil, find the viscosity of oil and express it in 
units of poise as well as N-s/m, Assume the plate as frictionless. 
The following is the set of observed data for successive 15 minutes period of 
105 minutes storm in a catchment : 
|Duration (min) 
(e) 
|Rainfall (cm/hr) 
SECTION-A 
15 
2-0 
30 
2-0 
SGSET-CVL/69 
45 
80 
60 
7-0 
75 
2 
90 
1:25 1·25 
105 
If the value of -index is 3-0 cm/hr, estimate the net runoff, the total 
rainfall 
and the value of W-index. 
(c) A hydraulic turbine has an output of 6600 kw when it works under a head of 
25 m and runs at 100 r.p.m. What is the type of the turbine? What would be its 
speed and what power will it develop when working under a head of 16 m? 
4-5 
(a)) A large stream flowing through an 
industrialised area is the only source of raw 
water for the community water supply. The stream water is consistently turbid, 
has hardness in excess of 300 mg/L as CaCO and has refractory organics 
that are known precursor of trihalomethanes. Draw a schematic diagram of a 
treatment plant that could render this water potable. Identify all the units. 
State their purpose, show points of chemical addition and identify all the 
chemicals. 
For BOD analysis, 30 mL of treated wastewater sample with DO of zero was 
mixed with 270 mL of dilution water with DO of 10 mg/L. The 5th and 6th days 
being holidays, the lab was closed. The final DO was measured as 4 mg/L on 
the 7th day. It was also found that the incubator was set at 30 °C. Assuming 
the BOD reaction rate constant as 023 day at 20 °C and the temperature 
coefficient as 1-047, determine the 5-day, 20 °C BOD of the sample. 
2. (a) Treated wastewater having a peak flow rate of 12000 m /day. BOD: of 
30 
mg/L, DO 
concentration of 1 
mg/L and 
temperature 
of 27 °C is 
discharged 
in a 
stream. Before getting mnixed with the 
wastewater, the 
stream has a 
minimum flow rate of 0-4 
m°/s, BODs of 4 
mg/L, DO 
concentration 
of7 
me/L 
and 
temperature of 25 °C. After 
instantaneous and 
complete mixing, the 
sHelocity of the 
mixed flow is 0:2 
m/s. For the 
mnixed flow, the 
BOD 
reaction rate 
constant is 0:-2 day 
and the 
reaeration 
Constant is 0-4 
dav1 at 20 °C. 
Estimate the 
initial 
oxygen deicit and Do 
after two 
days of 
fow. 
Take 
temperature 
coefficient for 
BOD 
reacuon at 
constant as 
1047 and for 
stream 
regeration rate 
constant as 
1016. lake 
equlibrium 
concentration 
of 
DO for 
water after mixing as 83 mg/L. 
12 
12 
12 
12 
12 
20 
Page 3


1 
Time Allowed: Three Hours 
CIVIL ENGINEERING 
PAPER-II 
oUESTION PAPER SPECIFIC INSTRUCTIONS 
There are EIGHT questions divided in TWO Sections. 
Please read each of the following instructions carefully 
before attempting questions 
Candidate has to attempt FIVE questions in all. 
SGSE-T-CVL 
Maximum Marks : 300 
Question Nos. 1 and 5 are compulsory and out of the remaining, THREE are to be 
attempted choosing at least ONE question from each Section. 
The number of marks carried by a question/ part is indicated against it. 
Wherever any assumptions are made for answering a question, they must be clearly 
indicated. 
Diagrams/Figures, wherever required, shall be drawn in the space provided for answering 
the questions itself. 
SGSE T-CVL/69 
Unless otherwise mentioned, symbols and notations have their usual standard meanings. 
Attempts of questions shall be counted in sequential order. Unless struck off, attempt of a 
question shall be 
counted even if 
attempted party. 
Answers must be written in ENGLISH only. 
Any page or portion of the page left blank in the Question-cum-Answer (QCA) Booklet 
must be clearly struck off. 
1 
[P.T.O. 
UPSC ESE Mains 2024 Civil Engineering Question Paper 23 June 2024
1. 
(a) A 
rectangular plate of 0-50 m x 050 m 
dimensions and weighing 500 N slides 
down an inclined plane making 30 angle with the horizontal. The velocity of 
the plate is 175 m/s. If the 2 mm gap between the plate and the inclined 
surface is filled with lubricating oil, find the viscosity of oil and express it in 
units of poise as well as N-s/m, Assume the plate as frictionless. 
The following is the set of observed data for successive 15 minutes period of 
105 minutes storm in a catchment : 
|Duration (min) 
(e) 
|Rainfall (cm/hr) 
SECTION-A 
15 
2-0 
30 
2-0 
SGSET-CVL/69 
45 
80 
60 
7-0 
75 
2 
90 
1:25 1·25 
105 
If the value of -index is 3-0 cm/hr, estimate the net runoff, the total 
rainfall 
and the value of W-index. 
(c) A hydraulic turbine has an output of 6600 kw when it works under a head of 
25 m and runs at 100 r.p.m. What is the type of the turbine? What would be its 
speed and what power will it develop when working under a head of 16 m? 
4-5 
(a)) A large stream flowing through an 
industrialised area is the only source of raw 
water for the community water supply. The stream water is consistently turbid, 
has hardness in excess of 300 mg/L as CaCO and has refractory organics 
that are known precursor of trihalomethanes. Draw a schematic diagram of a 
treatment plant that could render this water potable. Identify all the units. 
State their purpose, show points of chemical addition and identify all the 
chemicals. 
For BOD analysis, 30 mL of treated wastewater sample with DO of zero was 
mixed with 270 mL of dilution water with DO of 10 mg/L. The 5th and 6th days 
being holidays, the lab was closed. The final DO was measured as 4 mg/L on 
the 7th day. It was also found that the incubator was set at 30 °C. Assuming 
the BOD reaction rate constant as 023 day at 20 °C and the temperature 
coefficient as 1-047, determine the 5-day, 20 °C BOD of the sample. 
2. (a) Treated wastewater having a peak flow rate of 12000 m /day. BOD: of 
30 
mg/L, DO 
concentration of 1 
mg/L and 
temperature 
of 27 °C is 
discharged 
in a 
stream. Before getting mnixed with the 
wastewater, the 
stream has a 
minimum flow rate of 0-4 
m°/s, BODs of 4 
mg/L, DO 
concentration 
of7 
me/L 
and 
temperature of 25 °C. After 
instantaneous and 
complete mixing, the 
sHelocity of the 
mixed flow is 0:2 
m/s. For the 
mnixed flow, the 
BOD 
reaction rate 
constant is 0:-2 day 
and the 
reaeration 
Constant is 0-4 
dav1 at 20 °C. 
Estimate the 
initial 
oxygen deicit and Do 
after two 
days of 
fow. 
Take 
temperature 
coefficient for 
BOD 
reacuon at 
constant as 
1047 and for 
stream 
regeration rate 
constant as 
1016. lake 
equlibrium 
concentration 
of 
DO for 
water after mixing as 83 mg/L. 
12 
12 
12 
12 
12 
20 
(b) () For a hydraulic jump n a rectangular channel, the velocity and depth after 
3. (a) 
the jump are known to be O-80 m/s and 1-75 m respectively. Calculate the 
depth before jump, the energy loss and the power dissipated per metre 
width. 
e) A water treatment plant n a city of 100000 population supplies water at 
the rate of 150 Ipcd. Two equal capacity circular settling tanks are to be 
provided to settle flocculent suspension through Type-II settling. Design 
the tanks. Take SOR as 20 m' /m-d and water depth of 3-5 m. Leave 
(bl 
What do you mean by iversion headworks? Distinguish clearly between a 
weir and a barrage. 
sludge zone of 05 m and keep inlet and outlet zones equal to the side 
water depth. Calculate the weir loading. Draw the sketch of the tank 
showing all the zones arnd 
dimensions. 
ü) In an ideal granular media flter, the entire depth of the filter media should 
contribute to the retention and removal of solids, ensuring longer filter 
uns, less head loss and greater filtration rates. Why will the single media 
flters fail to achieve this? How can the mixed media flter approach an 
ideal filter in performance? 
) Design a tube well for the following data : 
Yield required = 0-10 m/s 
Radius of circle of influence = 200 m 
Coeficient of permeability 60 m/day 
Drawdown = 6 m 
Thickness of confined aquifer = 30 m 
Describe briefly the various methods adopted as anti-waterlogging 
measures. 
9 Design an irrigation channel in alluvial soil according to Lacey's silt theory 
for the following data : 
SGSE-T-CVL/69 
Full supply discharge = 10 m°/s 
Lacey's silt factor = 0-9 
1 
Side slopes of channel = (H) : 1 (V) 
i) What is gravity dam? Enumerate the various forces acting on gravity dam. 
(9 A settling column analysis is run to determine the settling characteristics 
of sludge from an activated sludge reactor with the following results : 
Concentration 
2 
of MLSS (mg/L) : 1000 2000 3000 4000 5000 6000 
Settling 
velocity (m/hr) : 2:8 
0-06 
The tlow to the secondary clarifier is 4200 m°/day with MLSS 
Concentration of 2000 me/L. Determine the required diameter of the 
Ciariner for a 
preselected solid flux rate of 2·5 
kg/m-hr. Check the area 
requirement for the clarification function also. 
3 
1:4 
0-4 02 01 
15 
5 
12 
15 
5 
15 
5 
12 
[P.T.0. 
Page 4


1 
Time Allowed: Three Hours 
CIVIL ENGINEERING 
PAPER-II 
oUESTION PAPER SPECIFIC INSTRUCTIONS 
There are EIGHT questions divided in TWO Sections. 
Please read each of the following instructions carefully 
before attempting questions 
Candidate has to attempt FIVE questions in all. 
SGSE-T-CVL 
Maximum Marks : 300 
Question Nos. 1 and 5 are compulsory and out of the remaining, THREE are to be 
attempted choosing at least ONE question from each Section. 
The number of marks carried by a question/ part is indicated against it. 
Wherever any assumptions are made for answering a question, they must be clearly 
indicated. 
Diagrams/Figures, wherever required, shall be drawn in the space provided for answering 
the questions itself. 
SGSE T-CVL/69 
Unless otherwise mentioned, symbols and notations have their usual standard meanings. 
Attempts of questions shall be counted in sequential order. Unless struck off, attempt of a 
question shall be 
counted even if 
attempted party. 
Answers must be written in ENGLISH only. 
Any page or portion of the page left blank in the Question-cum-Answer (QCA) Booklet 
must be clearly struck off. 
1 
[P.T.O. 
UPSC ESE Mains 2024 Civil Engineering Question Paper 23 June 2024
1. 
(a) A 
rectangular plate of 0-50 m x 050 m 
dimensions and weighing 500 N slides 
down an inclined plane making 30 angle with the horizontal. The velocity of 
the plate is 175 m/s. If the 2 mm gap between the plate and the inclined 
surface is filled with lubricating oil, find the viscosity of oil and express it in 
units of poise as well as N-s/m, Assume the plate as frictionless. 
The following is the set of observed data for successive 15 minutes period of 
105 minutes storm in a catchment : 
|Duration (min) 
(e) 
|Rainfall (cm/hr) 
SECTION-A 
15 
2-0 
30 
2-0 
SGSET-CVL/69 
45 
80 
60 
7-0 
75 
2 
90 
1:25 1·25 
105 
If the value of -index is 3-0 cm/hr, estimate the net runoff, the total 
rainfall 
and the value of W-index. 
(c) A hydraulic turbine has an output of 6600 kw when it works under a head of 
25 m and runs at 100 r.p.m. What is the type of the turbine? What would be its 
speed and what power will it develop when working under a head of 16 m? 
4-5 
(a)) A large stream flowing through an 
industrialised area is the only source of raw 
water for the community water supply. The stream water is consistently turbid, 
has hardness in excess of 300 mg/L as CaCO and has refractory organics 
that are known precursor of trihalomethanes. Draw a schematic diagram of a 
treatment plant that could render this water potable. Identify all the units. 
State their purpose, show points of chemical addition and identify all the 
chemicals. 
For BOD analysis, 30 mL of treated wastewater sample with DO of zero was 
mixed with 270 mL of dilution water with DO of 10 mg/L. The 5th and 6th days 
being holidays, the lab was closed. The final DO was measured as 4 mg/L on 
the 7th day. It was also found that the incubator was set at 30 °C. Assuming 
the BOD reaction rate constant as 023 day at 20 °C and the temperature 
coefficient as 1-047, determine the 5-day, 20 °C BOD of the sample. 
2. (a) Treated wastewater having a peak flow rate of 12000 m /day. BOD: of 
30 
mg/L, DO 
concentration of 1 
mg/L and 
temperature 
of 27 °C is 
discharged 
in a 
stream. Before getting mnixed with the 
wastewater, the 
stream has a 
minimum flow rate of 0-4 
m°/s, BODs of 4 
mg/L, DO 
concentration 
of7 
me/L 
and 
temperature of 25 °C. After 
instantaneous and 
complete mixing, the 
sHelocity of the 
mixed flow is 0:2 
m/s. For the 
mnixed flow, the 
BOD 
reaction rate 
constant is 0:-2 day 
and the 
reaeration 
Constant is 0-4 
dav1 at 20 °C. 
Estimate the 
initial 
oxygen deicit and Do 
after two 
days of 
fow. 
Take 
temperature 
coefficient for 
BOD 
reacuon at 
constant as 
1047 and for 
stream 
regeration rate 
constant as 
1016. lake 
equlibrium 
concentration 
of 
DO for 
water after mixing as 83 mg/L. 
12 
12 
12 
12 
12 
20 
(b) () For a hydraulic jump n a rectangular channel, the velocity and depth after 
3. (a) 
the jump are known to be O-80 m/s and 1-75 m respectively. Calculate the 
depth before jump, the energy loss and the power dissipated per metre 
width. 
e) A water treatment plant n a city of 100000 population supplies water at 
the rate of 150 Ipcd. Two equal capacity circular settling tanks are to be 
provided to settle flocculent suspension through Type-II settling. Design 
the tanks. Take SOR as 20 m' /m-d and water depth of 3-5 m. Leave 
(bl 
What do you mean by iversion headworks? Distinguish clearly between a 
weir and a barrage. 
sludge zone of 05 m and keep inlet and outlet zones equal to the side 
water depth. Calculate the weir loading. Draw the sketch of the tank 
showing all the zones arnd 
dimensions. 
ü) In an ideal granular media flter, the entire depth of the filter media should 
contribute to the retention and removal of solids, ensuring longer filter 
uns, less head loss and greater filtration rates. Why will the single media 
flters fail to achieve this? How can the mixed media flter approach an 
ideal filter in performance? 
) Design a tube well for the following data : 
Yield required = 0-10 m/s 
Radius of circle of influence = 200 m 
Coeficient of permeability 60 m/day 
Drawdown = 6 m 
Thickness of confined aquifer = 30 m 
Describe briefly the various methods adopted as anti-waterlogging 
measures. 
9 Design an irrigation channel in alluvial soil according to Lacey's silt theory 
for the following data : 
SGSE-T-CVL/69 
Full supply discharge = 10 m°/s 
Lacey's silt factor = 0-9 
1 
Side slopes of channel = (H) : 1 (V) 
i) What is gravity dam? Enumerate the various forces acting on gravity dam. 
(9 A settling column analysis is run to determine the settling characteristics 
of sludge from an activated sludge reactor with the following results : 
Concentration 
2 
of MLSS (mg/L) : 1000 2000 3000 4000 5000 6000 
Settling 
velocity (m/hr) : 2:8 
0-06 
The tlow to the secondary clarifier is 4200 m°/day with MLSS 
Concentration of 2000 me/L. Determine the required diameter of the 
Ciariner for a 
preselected solid flux rate of 2·5 
kg/m-hr. Check the area 
requirement for the clarification function also. 
3 
1:4 
0-4 02 01 
15 
5 
12 
15 
5 
15 
5 
12 
[P.T.0. 
LA) 
Why 
do the 
conventional 
channel 
type 
horizontal 
flow 
grit 
chambers 
require 
the 
velocity 
control 
devices? 
What 
are 
the 
common 
velocity 
control 
devices 
that are 
used? 
What 
advantages 
the 
aerated 
grit 
chamber 
has 
over 
the 
conventional 
grit 
chamber? 
4. (a) (9 A kite weighing 
12:26 N 
has an 
effective 
area 
of 
0-9 
m. 
The 
tension 
in 
the 
kite string 
is 
32:37 N 
when 
the 
string 
makes 
an 
angle 
of 
45° 
with 
the 
horizontal. For a 
wind of 32 
km/hr, 
what are 
the 
coefficients 
of 
lift 
and 
(c) 
drag if 
the 
kite 
assumes 
an 
angle 
of 8° 
with 
the 
horizontal? 
Take 
specific 
weight 
of 
air 
as 
11:801 
N/m. 
(ü) 
A 
125 m 
diameter 
pipe 
has to 
be 
provided 
to 
convey 
oil 
of 
specific 
gravity 
0-85 
and 
kinematic 
viscosity 
of 
2-75 
centistokes 
at a 
velocity of 
1:25 
m/s. 
In 
order to 
model 
the 
flow, if a 
120 
mm 
diameter 
pipe is 
used 
to 
convey 
water 
of 
kinematic 
viscosity 
1-0 
centistokes. 
what 
should 
be 
the 
velocity 
and 
the 
discharge in 
the 
model? 
(b) 
A 
city of 1 
million 
population 
generates 
0-45 
kg 
per 
capita 
per 
day of 
MSW. 
Collection 
trucks of 
capacity 4-5 
metric 
tonnes 
averaging 
two 
trips 
per 
day at 
75% 
capacity 
operate 
all 
the 
days in a 
week to 
transfer 
the 
waste to 
centralised 
processing 
and 
landfill 
site. 
How 
many 
trucks 
per 
day 
will 
be 
required 
to 
transfer 
the 
waste? If 
albout 
459% 
waste is 
recycled, 
what is 
the 
mass 
of 
MSW 
entering 
the 
landfill? If 
the 
density of 
the 
waste is 
280 
kg/m, 
what is the 
volume of 
MSW? 
Determine the 
area 
required for the 
landfill 
with the 
projected 
life of 30 
years, if 
the 
density of the 
compacted 
waste is 
450 
kg/m 
and 
the 
maximum 
height of the 
landfill is 
limited to 15 m, 
Neglect the 
volume of 
cover. 
() 
Explain the 
following 
characteristic 
terms for 
biological 
organisms 
based 
on 
their 
carbon 
and 
energy 
Sources : 
() Phototrophs 
(1) Chemotrophs 
(n) Autotrophs 
(V) Heterotrophs 
Arrange the 
following 
organisms 
according to 
their 
trophic levels 
giving 
your reasoning: 
(A) Chemoheterotrophs 
(B) Photoheterotrophs 
(C) Photoautotrophs 
(D) Chemoautotrophs 
3 
(ü) The ambient air 
concentration of 
carbon monoxide was 
reported as 4 mg/ 
m° at the 
temperature of 25 °C and 
pressure of 103·193 kPa.. What will be 
the 
concentration in ppm at STP? 
3 
SGSE-T-CVL/69 
4 
8 
10 
10 
20 
10 
10 
Page 5


1 
Time Allowed: Three Hours 
CIVIL ENGINEERING 
PAPER-II 
oUESTION PAPER SPECIFIC INSTRUCTIONS 
There are EIGHT questions divided in TWO Sections. 
Please read each of the following instructions carefully 
before attempting questions 
Candidate has to attempt FIVE questions in all. 
SGSE-T-CVL 
Maximum Marks : 300 
Question Nos. 1 and 5 are compulsory and out of the remaining, THREE are to be 
attempted choosing at least ONE question from each Section. 
The number of marks carried by a question/ part is indicated against it. 
Wherever any assumptions are made for answering a question, they must be clearly 
indicated. 
Diagrams/Figures, wherever required, shall be drawn in the space provided for answering 
the questions itself. 
SGSE T-CVL/69 
Unless otherwise mentioned, symbols and notations have their usual standard meanings. 
Attempts of questions shall be counted in sequential order. Unless struck off, attempt of a 
question shall be 
counted even if 
attempted party. 
Answers must be written in ENGLISH only. 
Any page or portion of the page left blank in the Question-cum-Answer (QCA) Booklet 
must be clearly struck off. 
1 
[P.T.O. 
UPSC ESE Mains 2024 Civil Engineering Question Paper 23 June 2024
1. 
(a) A 
rectangular plate of 0-50 m x 050 m 
dimensions and weighing 500 N slides 
down an inclined plane making 30 angle with the horizontal. The velocity of 
the plate is 175 m/s. If the 2 mm gap between the plate and the inclined 
surface is filled with lubricating oil, find the viscosity of oil and express it in 
units of poise as well as N-s/m, Assume the plate as frictionless. 
The following is the set of observed data for successive 15 minutes period of 
105 minutes storm in a catchment : 
|Duration (min) 
(e) 
|Rainfall (cm/hr) 
SECTION-A 
15 
2-0 
30 
2-0 
SGSET-CVL/69 
45 
80 
60 
7-0 
75 
2 
90 
1:25 1·25 
105 
If the value of -index is 3-0 cm/hr, estimate the net runoff, the total 
rainfall 
and the value of W-index. 
(c) A hydraulic turbine has an output of 6600 kw when it works under a head of 
25 m and runs at 100 r.p.m. What is the type of the turbine? What would be its 
speed and what power will it develop when working under a head of 16 m? 
4-5 
(a)) A large stream flowing through an 
industrialised area is the only source of raw 
water for the community water supply. The stream water is consistently turbid, 
has hardness in excess of 300 mg/L as CaCO and has refractory organics 
that are known precursor of trihalomethanes. Draw a schematic diagram of a 
treatment plant that could render this water potable. Identify all the units. 
State their purpose, show points of chemical addition and identify all the 
chemicals. 
For BOD analysis, 30 mL of treated wastewater sample with DO of zero was 
mixed with 270 mL of dilution water with DO of 10 mg/L. The 5th and 6th days 
being holidays, the lab was closed. The final DO was measured as 4 mg/L on 
the 7th day. It was also found that the incubator was set at 30 °C. Assuming 
the BOD reaction rate constant as 023 day at 20 °C and the temperature 
coefficient as 1-047, determine the 5-day, 20 °C BOD of the sample. 
2. (a) Treated wastewater having a peak flow rate of 12000 m /day. BOD: of 
30 
mg/L, DO 
concentration of 1 
mg/L and 
temperature 
of 27 °C is 
discharged 
in a 
stream. Before getting mnixed with the 
wastewater, the 
stream has a 
minimum flow rate of 0-4 
m°/s, BODs of 4 
mg/L, DO 
concentration 
of7 
me/L 
and 
temperature of 25 °C. After 
instantaneous and 
complete mixing, the 
sHelocity of the 
mixed flow is 0:2 
m/s. For the 
mnixed flow, the 
BOD 
reaction rate 
constant is 0:-2 day 
and the 
reaeration 
Constant is 0-4 
dav1 at 20 °C. 
Estimate the 
initial 
oxygen deicit and Do 
after two 
days of 
fow. 
Take 
temperature 
coefficient for 
BOD 
reacuon at 
constant as 
1047 and for 
stream 
regeration rate 
constant as 
1016. lake 
equlibrium 
concentration 
of 
DO for 
water after mixing as 83 mg/L. 
12 
12 
12 
12 
12 
20 
(b) () For a hydraulic jump n a rectangular channel, the velocity and depth after 
3. (a) 
the jump are known to be O-80 m/s and 1-75 m respectively. Calculate the 
depth before jump, the energy loss and the power dissipated per metre 
width. 
e) A water treatment plant n a city of 100000 population supplies water at 
the rate of 150 Ipcd. Two equal capacity circular settling tanks are to be 
provided to settle flocculent suspension through Type-II settling. Design 
the tanks. Take SOR as 20 m' /m-d and water depth of 3-5 m. Leave 
(bl 
What do you mean by iversion headworks? Distinguish clearly between a 
weir and a barrage. 
sludge zone of 05 m and keep inlet and outlet zones equal to the side 
water depth. Calculate the weir loading. Draw the sketch of the tank 
showing all the zones arnd 
dimensions. 
ü) In an ideal granular media flter, the entire depth of the filter media should 
contribute to the retention and removal of solids, ensuring longer filter 
uns, less head loss and greater filtration rates. Why will the single media 
flters fail to achieve this? How can the mixed media flter approach an 
ideal filter in performance? 
) Design a tube well for the following data : 
Yield required = 0-10 m/s 
Radius of circle of influence = 200 m 
Coeficient of permeability 60 m/day 
Drawdown = 6 m 
Thickness of confined aquifer = 30 m 
Describe briefly the various methods adopted as anti-waterlogging 
measures. 
9 Design an irrigation channel in alluvial soil according to Lacey's silt theory 
for the following data : 
SGSE-T-CVL/69 
Full supply discharge = 10 m°/s 
Lacey's silt factor = 0-9 
1 
Side slopes of channel = (H) : 1 (V) 
i) What is gravity dam? Enumerate the various forces acting on gravity dam. 
(9 A settling column analysis is run to determine the settling characteristics 
of sludge from an activated sludge reactor with the following results : 
Concentration 
2 
of MLSS (mg/L) : 1000 2000 3000 4000 5000 6000 
Settling 
velocity (m/hr) : 2:8 
0-06 
The tlow to the secondary clarifier is 4200 m°/day with MLSS 
Concentration of 2000 me/L. Determine the required diameter of the 
Ciariner for a 
preselected solid flux rate of 2·5 
kg/m-hr. Check the area 
requirement for the clarification function also. 
3 
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[P.T.0. 
LA) 
Why 
do the 
conventional 
channel 
type 
horizontal 
flow 
grit 
chambers 
require 
the 
velocity 
control 
devices? 
What 
are 
the 
common 
velocity 
control 
devices 
that are 
used? 
What 
advantages 
the 
aerated 
grit 
chamber 
has 
over 
the 
conventional 
grit 
chamber? 
4. (a) (9 A kite weighing 
12:26 N 
has an 
effective 
area 
of 
0-9 
m. 
The 
tension 
in 
the 
kite string 
is 
32:37 N 
when 
the 
string 
makes 
an 
angle 
of 
45° 
with 
the 
horizontal. For a 
wind of 32 
km/hr, 
what are 
the 
coefficients 
of 
lift 
and 
(c) 
drag if 
the 
kite 
assumes 
an 
angle 
of 8° 
with 
the 
horizontal? 
Take 
specific 
weight 
of 
air 
as 
11:801 
N/m. 
(ü) 
A 
125 m 
diameter 
pipe 
has to 
be 
provided 
to 
convey 
oil 
of 
specific 
gravity 
0-85 
and 
kinematic 
viscosity 
of 
2-75 
centistokes 
at a 
velocity of 
1:25 
m/s. 
In 
order to 
model 
the 
flow, if a 
120 
mm 
diameter 
pipe is 
used 
to 
convey 
water 
of 
kinematic 
viscosity 
1-0 
centistokes. 
what 
should 
be 
the 
velocity 
and 
the 
discharge in 
the 
model? 
(b) 
A 
city of 1 
million 
population 
generates 
0-45 
kg 
per 
capita 
per 
day of 
MSW. 
Collection 
trucks of 
capacity 4-5 
metric 
tonnes 
averaging 
two 
trips 
per 
day at 
75% 
capacity 
operate 
all 
the 
days in a 
week to 
transfer 
the 
waste to 
centralised 
processing 
and 
landfill 
site. 
How 
many 
trucks 
per 
day 
will 
be 
required 
to 
transfer 
the 
waste? If 
albout 
459% 
waste is 
recycled, 
what is 
the 
mass 
of 
MSW 
entering 
the 
landfill? If 
the 
density of 
the 
waste is 
280 
kg/m, 
what is the 
volume of 
MSW? 
Determine the 
area 
required for the 
landfill 
with the 
projected 
life of 30 
years, if 
the 
density of the 
compacted 
waste is 
450 
kg/m 
and 
the 
maximum 
height of the 
landfill is 
limited to 15 m, 
Neglect the 
volume of 
cover. 
() 
Explain the 
following 
characteristic 
terms for 
biological 
organisms 
based 
on 
their 
carbon 
and 
energy 
Sources : 
() Phototrophs 
(1) Chemotrophs 
(n) Autotrophs 
(V) Heterotrophs 
Arrange the 
following 
organisms 
according to 
their 
trophic levels 
giving 
your reasoning: 
(A) Chemoheterotrophs 
(B) Photoheterotrophs 
(C) Photoautotrophs 
(D) Chemoautotrophs 
3 
(ü) The ambient air 
concentration of 
carbon monoxide was 
reported as 4 mg/ 
m° at the 
temperature of 25 °C and 
pressure of 103·193 kPa.. What will be 
the 
concentration in ppm at STP? 
3 
SGSE-T-CVL/69 
4 
8 
10 
10 
20 
10 
10 
5. (a) A field vane shear test wAs CATTied out on a deep-seated soft clay layer. The 
vane wAs 11-25 cm high and 75 cm acro88 the blades. The 
equivalent torque 
recorded at the torque head at fallure WAs 800 kg-cm. The vane was then 
rotated very rapidly in order to 
completely remould the soil. It was found that 
the remoulded soil can be sheared by applying a torque of 400 kg-cm. 
Compute the shear strength of the soil in the 
undisturbed and 
remoulded 
states and its 
sensitivity. 
(b) A 25 m wide strip footing is founded at a depth of 2:0 m below the ground level 
in a 
homogeneous pure clay bed. The unit 
cohesion of clay is 35 kPa. Due to 
seasonal fuctuations of water table from peak summer (fully dry soil) to peak 
monsoon (fully saturated soil), 
compute the change in the net ultimate 
bearing 
capacity as per 
Terzaghi's 
theory. 
(c) Design the thickness of a flexible pavement for the design life of 15 years 
having 
two-lane single 
carriageway 7-0 m wide and 
present traffic of 800 
commercial vehicles per day (CVPD). Out of total 800 CVPD, 300 have vehicle 
damage factor (VDE) of 2:5 and 500 have VDF of 3-0. The planning and 
construction period is 2 years and annual vehicle growth rate is 75%. Design 
the flexible pavement from the data given below if the effective CBR of the 
subgrade is 9%. Assume any missing data suitably : 
Design traffic 
(e) 
5 msa 
10 msa 
20 rnsa 
30 msa 
SECTION--B 
Wearing 
course (mm) 
SGSE-T-CVL/69 
25 SDBC 
40 BC 
40 BC 
40 BC 
Binder 
course (mm) 
50 DBM 
50 DBM 
80 DBM 
95 DBM 
Base (mm) 
250 
250 
250 
250 
The following, staff readings were taken with a level : 
Sub-base 
(mm) 
150 
200 
(d) Calculate the speed restriction for a 2° curve on a broad-gauge section with 
maximum permissible speed of 100 km/hr. Due to space restrictions, the 
length of transition curve is limited to 50 m and superelevation provided is 
60 mm. 
200 
200 
1-255, 1-950, 2450, 3-100, 3900, 12i5, 1795, 2-800, 3-500, 0-560, 
12}0, 1900, 2-955 
The level was shifted after the 5th and 9th reading, and the 7th reading was 
taken to a benchmark of RL 120-00 m. Arrange the data in tabular form and 
find the reduced level of all the points by rise and fall method. Also apply the 
usual checks for calculations. 
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[P.T.0.