Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 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 2019
Subject Code: 2134004 Date: 05/12/2019
Subject Name: Green Chemistry & Technology
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.
MARKS
Q.1 (a) What is the difference between Green Chemistry and Environmental
Chemistry?
03
(b) What are the main objectives of integrated waste management? Define
the 4R is in terms of green chemistry.
04
(c) Are supercritical fluids green in nature? Justify your answer with the help
of suitable example.
07
Q.2 (a) Write the dangerous effects of leads and arsenic poisoning on human
health?
03
(b) Comment on the challenges for sustainable development in our country
and suggest a way to overcome the same.
04
(c) Describe with neat sketch cyclone, venturiscrubber for the air
purification.
07
OR
(c) Explain the construction of solar panel with the utilization of solar energy
for various purposes.
07
Q.3 (a) Enlist the national ambient air quality standards? 03
(b) Find the diameter of a particle with specific gravity of 2.65 removed in a
tank having surface area of 250 m
2
and treating 12 MLD of water per day.
Assume temperature = 26
0
C.
04
(c) 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
0
C, that
the angle of settler tube is 600, 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.
07
OR
Q.3 (a) Why does industry need Green Chemistry? 03
(b) Calculate the emission of NOx from all the vehicles in India, in 2018. The
fleet average NOx emission factor for 2018 was 1.645 g/miles and the
total vehicles miles travelled (VMT) in that year were 13.53 billion miles.
04
(c) A plane sedimentation tank with a length of 20 m, width of 10 m and a
depth of 3 m is used in a water treatment plant to treat 4 MLD. The
average temperature of water is 200C. Density of water is 998.2 kg/m3,
Take specific gravity = 2.65. Find (a) SOR (b) Did the particle which can
be removed with 100% efficiency.
07
Q.4 (a) What is zero waste technology? 03
(b)
Discuss supercritical carbon dioxide as a safer solvent in Green Chemistry with
two examples?
04
(c) An activated sludge system is operating at equilibrium with the following
information:
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 2134004 Date: 05/12/2019
Subject Name: Green Chemistry & Technology
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.
MARKS
Q.1 (a) What is the difference between Green Chemistry and Environmental
Chemistry?
03
(b) What are the main objectives of integrated waste management? Define
the 4R is in terms of green chemistry.
04
(c) Are supercritical fluids green in nature? Justify your answer with the help
of suitable example.
07
Q.2 (a) Write the dangerous effects of leads and arsenic poisoning on human
health?
03
(b) Comment on the challenges for sustainable development in our country
and suggest a way to overcome the same.
04
(c) Describe with neat sketch cyclone, venturiscrubber for the air
purification.
07
OR
(c) Explain the construction of solar panel with the utilization of solar energy
for various purposes.
07
Q.3 (a) Enlist the national ambient air quality standards? 03
(b) Find the diameter of a particle with specific gravity of 2.65 removed in a
tank having surface area of 250 m
2
and treating 12 MLD of water per day.
Assume temperature = 26
0
C.
04
(c) 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
0
C, that
the angle of settler tube is 600, 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.
07
OR
Q.3 (a) Why does industry need Green Chemistry? 03
(b) Calculate the emission of NOx from all the vehicles in India, in 2018. The
fleet average NOx emission factor for 2018 was 1.645 g/miles and the
total vehicles miles travelled (VMT) in that year were 13.53 billion miles.
04
(c) A plane sedimentation tank with a length of 20 m, width of 10 m and a
depth of 3 m is used in a water treatment plant to treat 4 MLD. The
average temperature of water is 200C. Density of water is 998.2 kg/m3,
Take specific gravity = 2.65. Find (a) SOR (b) Did the particle which can
be removed with 100% efficiency.
07
Q.4 (a) What is zero waste technology? 03
(b)
Discuss supercritical carbon dioxide as a safer solvent in Green Chemistry with
two examples?
04
(c) An activated sludge system is operating at equilibrium with the following
information:
07
2
Waste water flow rate = 500 m
3
/liter, Influent BOD= 150 mg/liter,
Effluent BOD= 10 mg/liter, HRT= 8 hours, Mean cell residence time =
240 hours, Volume of tank= 4000 m
3
, MLSS= 2000 mg/liter.
Find (a) F/M ratio (b) The mass of solid waste from the system in kg/day.
OR
Q.4 (a) What are green fuels? Why these are considered as non-polluting and
clean fuels?
03
(b) What do you mean by wind energy? Write the advantage and
disadvantage of nuclear power plant.
04
(c) Assume the annual energy requirement of an industry is 5000 kWh.
Calculate what will be the size of wind turbine that is required to be
installed to meet the energy requirement. Assume the following data:
Annual energy requirement is = 6000 kWh.
Propeller type wind machine is used, Coefficient of performance = 0.50,
wind speed at 13 m height is 4 m/s, density of air is 1 kg/m3, capacity
factor = 0.30 (i.e., 30% of the time, wind machine is producing energy at
rated power. Number of hour in year = 8670 hour.
07
Q.5 (a) Briefly discuss the energy flow in the ecosystem. 03
(b) Explain twelve principles of Green Chemistry, with suitable examples. 04
(c) Enlist the various types of water treatment process for maintaining the
quality of water. Describe the various types of aerator used for the water
treatment.
07
OR
Q.5 (a) Bring out the important aspects of renewable sources. 03
(b) Explain benefits of ?Green Chemistry? to human health, environment and
economy & business.
04
(c) Write short notes on the following:
(a) Ozone depletion
(b) Global climate change
(c) Carbon footprint
07
**********
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This post was last modified on 20 February 2020