Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 3rd Sem New 2134004 Green Chemistry And Technology Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER?III (New) EXAMINATION ? WINTER 2018
Subject Code:2134004 Date:12/12/2018
Subject Name:Green Chemistry & Technology
Time:10:30 AM TO 01:00 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
MARKS
i Define aeration and flocculation 1
ii Name any three coagulants used for the water treatment process. 1
iii A circular primary clarifiers processes an average flow of 5005
m
3
/day of municipal waste water. The overflow rate is 35
m
3
/m
2
/d. The diameter of clarifier will be??
2
iv The reoxygenation coefficient K of stream is 0.30 at 20
O
C. Its K
value at 32
O
C likely to be????.
2
v Define BOD. 1
vi Chemical oxygen demand of a sample is always greater than
Biochemical Oxygen Demand Since it represent?
1
vii A single rapid test to determine the pollution status of river water
is??.
1
viii Hardness of water is caused by the presence of ??? 1
ix The Ca
2+
and Mg
2+
concentration of water sample are 160 mg/lit
and 40 mg/lit as their ions respectively. The total hardness of
water in terms of CaCO
3
in mg/lit is approximately equal
to????.
2
x Methaemoglobinemia in children is caused by the presence of
excess?.
1
xi The microbial quality of treated piped supplies is monitered
by??.
1
Q2 a What do you mean by Indoor pollution give example? How you
can save yourself from indoor pollution.
4
b Write the tabular form of national ambient air quality standards.
3
c Using the given information find the population of city in 2010
and 2030 using geometrical increase method and incremental
increase methods
Year
1940 1950 1960 1970 1980 1990
Population
23400 65700 92800 102760 130900 187970
7
OR
Q2 a What are the pH of acid rains, normal rains, pure water, battery
acid and ocean water, lemon juice, vinegar and milk?
4
b What do you mean by greenhouse effect. Enlist the gases
responsible for greenhouse gas.
3
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER?III (New) EXAMINATION ? WINTER 2018
Subject Code:2134004 Date:12/12/2018
Subject Name:Green Chemistry & Technology
Time:10:30 AM TO 01:00 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
MARKS
i Define aeration and flocculation 1
ii Name any three coagulants used for the water treatment process. 1
iii A circular primary clarifiers processes an average flow of 5005
m
3
/day of municipal waste water. The overflow rate is 35
m
3
/m
2
/d. The diameter of clarifier will be??
2
iv The reoxygenation coefficient K of stream is 0.30 at 20
O
C. Its K
value at 32
O
C likely to be????.
2
v Define BOD. 1
vi Chemical oxygen demand of a sample is always greater than
Biochemical Oxygen Demand Since it represent?
1
vii A single rapid test to determine the pollution status of river water
is??.
1
viii Hardness of water is caused by the presence of ??? 1
ix The Ca
2+
and Mg
2+
concentration of water sample are 160 mg/lit
and 40 mg/lit as their ions respectively. The total hardness of
water in terms of CaCO
3
in mg/lit is approximately equal
to????.
2
x Methaemoglobinemia in children is caused by the presence of
excess?.
1
xi The microbial quality of treated piped supplies is monitered
by??.
1
Q2 a What do you mean by Indoor pollution give example? How you
can save yourself from indoor pollution.
4
b Write the tabular form of national ambient air quality standards.
3
c Using the given information find the population of city in 2010
and 2030 using geometrical increase method and incremental
increase methods
Year
1940 1950 1960 1970 1980 1990
Population
23400 65700 92800 102760 130900 187970
7
OR
Q2 a What are the pH of acid rains, normal rains, pure water, battery
acid and ocean water, lemon juice, vinegar and milk?
4
b What do you mean by greenhouse effect. Enlist the gases
responsible for greenhouse gas.
3
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c What is acid rain and what is its effects on the environment?
Enlist the gases responsible for the acid rains.
7
Q 3 a Find the settling velocity of spherical silica particle of pecific
gravity 2.67, in water at 25
0
C, if the diameter of particles is 0.004
cm.
4
b Describe briefly about turbidity. 3
c Write short notes on (a) Flouride content (b) chloride content and
(c) Nitrate content into the drinking water.
7
OR
Q3 a In continuous flow settling tank 3.5 m deep and 65 m long. Flow
velocity of water is observed as 1.22 cm/sec. What size of
particle of specific gravity 2.65 may be effectively removed in
this tank, if kinematic viscosity of water is 0.01cm
2
/sec.
4
b Write the standard value of following parameters for the drinking
water. (i) Hardness (ii) Chloride (iii) Calcium (iv) pH (v)
Flouride (vi) Nitrite
3
c The capacity of a water treatment plant is to treat 18 MLD of raw
water and the dose of required alum (Al
2
SO
4
)
3
.18H
2
O is 25 PPM.
Find
(a) Total quantity of alum required per year
(b) Total quantity of CO
2
gas produced per year
(c) Total quantity of floc generated per year
(d) Total quantity of hardness per year
7
Q 4 a Comment on the challenges for sustainable development in our
country and suggest a way to overcome the same.
4
b It is said ?prevention is better than cure?. Justified this
statement in context to green chemistry.
3
c A rapid sand filter proposed for a water supply treatment plant
of town having population of 75000, average water supply in the
town is 150 lpcd, rate of filtration is 100 lit/m
2
/min. Find the size
and no of filter bed required. Design the lateral and manifold
under drainage system. Compute the washwater discharge
required if rate of washing is 45 cm/min.
7
OR
Q 4 a The BOD
5
of a waste has been measured as 500 mg/lit. If the rate
constant K? = 0.26/day (base e), what is the ultimate BOD of
waste? What proportion of BOD
u
would remain unoxidaised
after 20 days.
4
b Mention various methods used to dispose solid wastes along
with their merits and demerits
3
c The following data refers to an ASP: (i) sewage discharge = 3500
m
3
/day (ii) volume of tank 10900 m
3
(iii) Influent BOD = 250
PPM (iv) Effluent BOD = 20 PPM (v) MLSS = 2500 PPM (vi)
7
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER?III (New) EXAMINATION ? WINTER 2018
Subject Code:2134004 Date:12/12/2018
Subject Name:Green Chemistry & Technology
Time:10:30 AM TO 01:00 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
MARKS
i Define aeration and flocculation 1
ii Name any three coagulants used for the water treatment process. 1
iii A circular primary clarifiers processes an average flow of 5005
m
3
/day of municipal waste water. The overflow rate is 35
m
3
/m
2
/d. The diameter of clarifier will be??
2
iv The reoxygenation coefficient K of stream is 0.30 at 20
O
C. Its K
value at 32
O
C likely to be????.
2
v Define BOD. 1
vi Chemical oxygen demand of a sample is always greater than
Biochemical Oxygen Demand Since it represent?
1
vii A single rapid test to determine the pollution status of river water
is??.
1
viii Hardness of water is caused by the presence of ??? 1
ix The Ca
2+
and Mg
2+
concentration of water sample are 160 mg/lit
and 40 mg/lit as their ions respectively. The total hardness of
water in terms of CaCO
3
in mg/lit is approximately equal
to????.
2
x Methaemoglobinemia in children is caused by the presence of
excess?.
1
xi The microbial quality of treated piped supplies is monitered
by??.
1
Q2 a What do you mean by Indoor pollution give example? How you
can save yourself from indoor pollution.
4
b Write the tabular form of national ambient air quality standards.
3
c Using the given information find the population of city in 2010
and 2030 using geometrical increase method and incremental
increase methods
Year
1940 1950 1960 1970 1980 1990
Population
23400 65700 92800 102760 130900 187970
7
OR
Q2 a What are the pH of acid rains, normal rains, pure water, battery
acid and ocean water, lemon juice, vinegar and milk?
4
b What do you mean by greenhouse effect. Enlist the gases
responsible for greenhouse gas.
3
www.FirstRanker.com www.FirstRanker.com
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www.FirstRanker.com
c What is acid rain and what is its effects on the environment?
Enlist the gases responsible for the acid rains.
7
Q 3 a Find the settling velocity of spherical silica particle of pecific
gravity 2.67, in water at 25
0
C, if the diameter of particles is 0.004
cm.
4
b Describe briefly about turbidity. 3
c Write short notes on (a) Flouride content (b) chloride content and
(c) Nitrate content into the drinking water.
7
OR
Q3 a In continuous flow settling tank 3.5 m deep and 65 m long. Flow
velocity of water is observed as 1.22 cm/sec. What size of
particle of specific gravity 2.65 may be effectively removed in
this tank, if kinematic viscosity of water is 0.01cm
2
/sec.
4
b Write the standard value of following parameters for the drinking
water. (i) Hardness (ii) Chloride (iii) Calcium (iv) pH (v)
Flouride (vi) Nitrite
3
c The capacity of a water treatment plant is to treat 18 MLD of raw
water and the dose of required alum (Al
2
SO
4
)
3
.18H
2
O is 25 PPM.
Find
(a) Total quantity of alum required per year
(b) Total quantity of CO
2
gas produced per year
(c) Total quantity of floc generated per year
(d) Total quantity of hardness per year
7
Q 4 a Comment on the challenges for sustainable development in our
country and suggest a way to overcome the same.
4
b It is said ?prevention is better than cure?. Justified this
statement in context to green chemistry.
3
c A rapid sand filter proposed for a water supply treatment plant
of town having population of 75000, average water supply in the
town is 150 lpcd, rate of filtration is 100 lit/m
2
/min. Find the size
and no of filter bed required. Design the lateral and manifold
under drainage system. Compute the washwater discharge
required if rate of washing is 45 cm/min.
7
OR
Q 4 a The BOD
5
of a waste has been measured as 500 mg/lit. If the rate
constant K? = 0.26/day (base e), what is the ultimate BOD of
waste? What proportion of BOD
u
would remain unoxidaised
after 20 days.
4
b Mention various methods used to dispose solid wastes along
with their merits and demerits
3
c The following data refers to an ASP: (i) sewage discharge = 3500
m
3
/day (ii) volume of tank 10900 m
3
(iii) Influent BOD = 250
PPM (iv) Effluent BOD = 20 PPM (v) MLSS = 2500 PPM (vi)
7
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Effluent suspended solids = 30 PPM (vii) Waste sludge
suspended solids = 9700 PPM (viii) quantity of waste sludge =
220 m
3
/day.
Find (i) HRT (ii) F/M ratio (iii) Efficiency (iv) Residence time
(v) SVI if settled volume is 150 mL/litre (vi) sludge return ratio
Q5 a Explain the construction of solar panel with the utilization of
solar energy for various purposes.
4
b Describe the tidal energy with advantage and disadvantage. 3
c What would be your suggestion towards 21
st
century energy
resources?
7
OR
Q5 a Design a wind turbine and estimate the required wind turbine
power rating using following data: (i) Annual energy
requirement ? 25000 kWh (ii) coefficient of perfoemance ? 0.40
(iii) density of air ? 1 kg/m
3
(iv) capacity factor ? 0.30 (v)
number of hours in a year 8760 hours (vi) wind speed at 15 m
height is 7 m/sec.
7
b Design a sedimentation tank for the city of Stillwater treatment
plant expansion using high-rate settlers. The maximum day
design flow is 0.5 m
3
/s. Assume a well settling alum floc, a water
temperature of 10
O
C, that the angle of settler tube is 60
O
, and that
the tubes have a hydraulic diameter of 50 mm and surface
overflow rate is 150 m
3
/m
2
/day. Assume suitable necessary data.
7
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This post was last modified on 20 February 2020