PED – 075

*PED075*

First Semester M.E. (Civil) Degree Examination, January 2015 (Semester Scheme) Environmental Engineering 2 K8 EN 103 : AIR POLLUTION AND CONTROL Time : 3 Hours

Max. Marks : 100

Instructions : 1) Assume suitable missing data. 2) Answer any five full questions. 3) All questions carry equal marks. 1. a) What is the composition of atmosphere ? Describe the atmospheric structure. 10 b) What are the pollutants found in atmosphere under these classification ? i) Aerosols

ii) Gases and vapours

Explain them.

10

2. a) Explain the air pollution effects on visibility.

8

b) Explain the harmful effects of the following air pollutants on human beings. i) Hydro carbons

ii) Carbon monoxide

iii) Oxides of Nitrogen

iv) Oxides of sulphur

v) Respirable dust

vi) Asbestos

3. a) How do you measure particulates and gases emitted at a source ? Explain.

12 10

b) Explain the terms : i) Environmental lapse rate ii) Adiabatic lapse rate iii) Wind rose iv) Inversion v) Emission standards.

10 P.T.O.

PED – 075

-2-

*PED075*

4. a) A glass fibre filter paper is found to have an initial weight of 8.02345 gms. After 24 hrs of sampling, using an high volume air sampler the filter paper weighed 8.16432 gms and the air flow rate at the start and the end of the experiment is 1.1 m3/min and 0.9 m3/min respectively. Calculate the concentration of suspended particulate matter. b) Explain the following : i) Representative sample ii) Sulphation rate iii) Non conventional air quality monitoring.

8

12

5. a) What are the principle gases of concern in air pollution ? Describe two major treatment processers to control these gases. 10 b) Define adsorption and differentiate between physical and chemical adsorption. Name the various types of adsorbents and their major uses in air pollution control. 10 6. a) Does induced centrifugal force help in controlling pollution ? If so, describe a system making use of this phenomenon for controlling air pollution. 10 b) Air stream with a flow rate of 7 mts/sec, is passed thro’ a cyclone of standard proportion. The dia of the cyclone is 2 mts and air temp. 77°C. Determine i) The removal efficiency for a particle of density 1.5 gms/cm3 and dia 10μm. ii) The collection efficiency based on the above it a bank of 64 cyclones with diameter of 24 cms are used instead of single large unit. 10 7. a) Explain the contact power theory as applicable to wet collection devices. Describe a device adopting this theory.

10

b) Explain the process of separation of particulates from a gas stream in a bag house filter. 10 8. Write short notes on any four of the following : i) Carbon trading ii) Acid rain iii) Global warming iv) Masking effect v) Electro-static precipitators vi) Scrubbers.

(4×5=20) _____________

Air pollution and control..pdf

3. a) How do you measure particulates and gases emitted at a source ? Explain. 10. b) Explain the terms : i) Environmental lapse rate. ii) Adiabatic lapse rate.

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