Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem New 2160604 Water And Waste Water Engineering Previous Question Paper
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2160604 Date: 11/12/2019
Subject Name: Water & Waste Water Engineering
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1* (a) What is the necessity of water supply schemes? Enlist phases involved in
water supply scheme.
03
(b) Write objectives of aeration and disinfection process in water treatment
plant.
04
(c) Draw a layout plan for a typical waste water treatment plant and explain
function of each unit.
07
Q.2 (a) Define residual chlorine and re-chlorination. 03
(b) Explain dead end system of water distribution network with its merits and
demerits.
04
(c) Design a rectangular sedimentation tank of a water treatment plant for a town
having population of 100000. Overflow rate= 25m/day, depth of tank =3.2m.
07
OR
(c) What is sedimentation with coagulation process? Derive the equation for
settling velocity in sedimentation tank.
07
Q.3 (a) Discuss different systems of water supply. 03
(b) What do you mean by optimum dose of a coagulant? How optimum
coagulant dose is determined?
04
(c) A city with 1.5 lakh population is to be supplied water at 100lpcd from a
river 1km away. The difference in water level of sump and reservoir is 30m.If
the demand has to be supplied in 8 hours, determine the size of the main and
B.H.P of the pumps required. Assume maximum demand of 1.5 times the
average demand. Take f? =0.075, velocity in the pipe as 2m/s and efficiency
of pump as 75 %.
07
OR
Q.3 (a) Define the following terms:
Flocculation, Type I settling, Detention time.
03
(b) Explain methods of disinfection of water. Enlist chemical used as
disinfectants.
04
(c) What is an intake structure? Sketch and explain in details about river intake. 07
Q.4 (a) What is maximum and minimum velocity in sewer? Write its importance in
sewer design.
03
(b) What are the different types of pipes used for water supply? Discuss any two
in details.
04
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2160604 Date: 11/12/2019
Subject Name: Water & Waste Water Engineering
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1* (a) What is the necessity of water supply schemes? Enlist phases involved in
water supply scheme.
03
(b) Write objectives of aeration and disinfection process in water treatment
plant.
04
(c) Draw a layout plan for a typical waste water treatment plant and explain
function of each unit.
07
Q.2 (a) Define residual chlorine and re-chlorination. 03
(b) Explain dead end system of water distribution network with its merits and
demerits.
04
(c) Design a rectangular sedimentation tank of a water treatment plant for a town
having population of 100000. Overflow rate= 25m/day, depth of tank =3.2m.
07
OR
(c) What is sedimentation with coagulation process? Derive the equation for
settling velocity in sedimentation tank.
07
Q.3 (a) Discuss different systems of water supply. 03
(b) What do you mean by optimum dose of a coagulant? How optimum
coagulant dose is determined?
04
(c) A city with 1.5 lakh population is to be supplied water at 100lpcd from a
river 1km away. The difference in water level of sump and reservoir is 30m.If
the demand has to be supplied in 8 hours, determine the size of the main and
B.H.P of the pumps required. Assume maximum demand of 1.5 times the
average demand. Take f? =0.075, velocity in the pipe as 2m/s and efficiency
of pump as 75 %.
07
OR
Q.3 (a) Define the following terms:
Flocculation, Type I settling, Detention time.
03
(b) Explain methods of disinfection of water. Enlist chemical used as
disinfectants.
04
(c) What is an intake structure? Sketch and explain in details about river intake. 07
Q.4 (a) What is maximum and minimum velocity in sewer? Write its importance in
sewer design.
03
(b) What are the different types of pipes used for water supply? Discuss any two
in details.
04
(c) Design a sewer to serve a population of 50000 with a water supply of 135
lpcd. The slope available for the sewer to be laid is 1 in 625 and the sewer to
should be designed to carry four times the dry weather flow when running
full. What would be the velocity of flow in the sewer when running full?
07
OR
Q.4 (a) Write components of water treatment plant. 03
(b) Enlist sewer appurtenances and explain manhole in brief. 04
(c) What are the sources of sludge from an ETP? Explain the characteristics of
sludge.
07
Q.5 (a) Define the following terms: Sullage, F/M ratio, Hydraulic retention time. 03
(b) Differentiate between attached growth process and suspended growth
process.
04
(c) Determine the size of high rate trickling filter for flow of 4.50MLD.
Recirculation ratio= 1.5, BOD of wastewater =250mg/l and final effluent
desired =30 mg/l.Assume suitable data if required.
07
OR
Q.5 (a) Define the following terms: Recirculation ratio, SVI, stabilization pond. 03
(b) Differentiate between trickling filter and activated sludge process. 04
(c) Design a conventional activated sludge plant to treat settled domestic sewage
with diffused air aeration system with the following data:
Population = 1,50,000
Average sewage flow = 150 lpcd
Settled sewage BOD5 = 200mg/l
Effluent BOD5 required = 10mg/l
07
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This post was last modified on 20 February 2020