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B. TECH.
(SEM VII) THEORY EXAMINATION 2019-20
AIR AND NOISE POLLUTION CONTROL
Time: 3 Hours Total Marks: 70
Note: 1. Attempt all Sections. If require any missing data; then choose suitably.
SECTION A
1. Attempt all questions in brief. 2 x 7 = 14
a. What is stack plume?
b. What is the difference between adsorption and absorption?
c. Describe indoor air pollution. Name any four indoor air pollutants.
d. Define Lapse rate, DALR and ELR.
e. What do you mean by the term acoustic?
f. What are the different layers of the atmosphere?
g. Name some of the special noise environment.
SECTION B
2. Attempt any three of the following: 7 x 3 = 21
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a. A coal fired power plant releases from the stack SPM at the rate of 2.3g/s. The
stack height is 60m while the temperature of the stack gases is 1600°C and the
ambient air temperature is 30°C. The wind velocity at the stack height is 2.5m/s,
while the stack gas velocity is 5.0m/s. The stack diameter is 3.5m. The
atmosphere pressure is 1.005 bar. The wind speed at 10m height from the
ground is 1.95 m/s. Estimate the ground level concentration for 1and 2 km
downwind distance take the standard deviations for 1km as σy = 34, σz =14; for
2km σy = 63, σz = 22 respectively.
b. Explain the electrostatic precipitator (ESP) in detail.
c. Write a short note on photo-chemical smog. Also describe the reactions
involved in the process.
d. What are the effects of the noise pollution on health?
e. Describe the catalytic convertor. Also, explain how it can be used to reduce the
automobile emissions with the help of reactions?
SECTION C
3. Attempt any one part of the following: 7x1=7
(a) Describe the principle of operation, advantages and limitations of Fabric filter
for particulate contaminants.
(b) Describe the principle of operation, advantages and limitations of Gravitational
settling chamber for particulate contaminants.
4. Attempt any one part of the following: 7x1=7
(a) Describe various types of pollutants emitted from petrol-driven and diesel-
driven motor vehicles. Also write Euro-1, Euro-II and Euro-III specifications
for pollution control in petrol driven passenger cars.
(b) What are the approaches for controlling the oxides of nitrogen in combustion
gases? Discuss the control methodology of oxides of nitrogen by combustion
modification.
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Paper Id: 100747 Roll No: 0 0 0 0 0 0 0 0 0 0 0 0 0
5. Attempt any one part of the following: 7x1=7
(a) Enumerate the effects of the air pollution on humans, animals, property and
plants.
(b) Explain primary and secondary air pollutants. Explain the sources and
consequence of air pollutants for the following:
(i) Sulphur-di-oxide (ii) Ozone(iii) Dust (iv) Fumes
6. Attempt any one part of the following: 7x1=7
(a) Explain in detail the outdoor noise propagation and indoor noise propagation in
relation with noise pollution and control.
(b) Explain the concept of equivalent continuous energy level(Leq).
7. Attempt any one part of the following: 7x1=7
(a) Briefly discuss the Absorption sampling collection techniques and sampling
devices for gaseous air pollutants.
(b) Briefly discuss the Adsorption sampling collection techniques and sampling
devices for gaseous air pollutants.
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