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GATE Civil Engineering (CE) 2020 Shift 1 Solved Paper
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© examsnet.com
Question : 50
Total: 65
A water supply scheme transports
10
M
L
D
(Million Litres per Day) water through a
450
m
m
diameter pipeline for a distance of
2.5
k
m
. A chlorine dose of
3.50
m
g
/litre is applied at the starting point of the pipeline to attain a certain level of disinfection at the downstream end. It is decided to increase the flow rate from
10
M
L
D
to
13
M
L
D
in the pipeline. Assume exponent for concentration,
n
=
0.86
. With this increased flow, in order to attain the same level of disinfection, the chlorine dose
3.95
4.40
5.55
4.75
Validate
Solution:
In the disinfection process we have the relationship
t
c
n
=
k
where,
t
=
time required to kill all organism
c
=
concentration of disinfectant
K
=
constant
∴
t
1
C
1
n
=
t
2
C
2
n
⇒
we know,
Q
=
V
t
⇒
t
=
V
Q
⇒
1
10
(
3.5
)
0.86
=
1
13
×
(
c
)
0.86
⇒
c
=
4.75
m
g
/
I
© examsnet.com
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