JUP – 088

*JUP088*

I Semester M.E. (Civil) (Env. Engg.) Degree Examination, February 2014 2K8EN 103 : AIR POLLUTION AND CONTROL Time : 3 Hours Instructions :

Max. Marks : 100 Answer any five questions. All questions carry equal marks. Assume necessary suitable data.

1. a) Define “Air Pollution”. How are the classification on different basis made ? Discuss them briefly. b) Mention the sources of the following pollutants : i) Hydrocarbons

iv) Chlorinated hydrocarbons

v) Carbon monoxide

vi) Oxides of nitrogen

c) Explain the source and effects of the following on human beings.

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ii) Carbon monoxides

2. a) What are lapse rates ? Mention the types and their determination. b) A rising parcel of dry air has a temp. of 15°C at sea level. Assuming a dry adiabatic lapse rate determine the temperature at 800 mts. 3. a) Explain the following in details with sketches : i) Temperature inversions

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ii) Hydrogen fluoride

iii) Dust

i) Asbestos

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ii) Adiabatic lapse rate

b) Determine the effective height of a stack from the following data :

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i) Physical height of stack = 180 mts ii) Cluside diameter of stack = 0.95 mts iii) Wind velocity = 2.75 mts/sec iv) Air temperature = 20°C v) Barometric pressure = 1000 millibars vi) Stack gas velocity = 11.12 mts/sec vii) Stack gas temperature = 160°C.

P.T.O.

*JUP088*

JUP – 088

4. a) Describe with neat sketches how different atmospheric conditions give rise to different kinds of plumes.

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b) Write and discuss “Gaussian Dispersion Model” and its utility in environmental application. 10 5. a) Explain the contact power theory applicable to wet collection devices. Describe with a sketch a device adopting this theory. 10 b) Explain the process of separation of particulates from a gas stream in a bay house filter. 10 6. a) What are the various types of automotive vehicles used in our country. Explain their merits and demerits in terms of air pollution in a city like Bangalore. b) Discuss and explain the following : i) Air fuel ratio

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ii) Spar timing

iii) Combined effect of AF ratio and spark timing iv) 2 stroke and 4 stroke engines. 7. a) When do you use combustion for abatement of air pollution. Describe the direct flame combustion. What parameters effect efficiency of combustion process. 12 b) Justify the necessity and need for an air pollution survey for an growing city like Bangalore.

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8. Write short notes on any four only : a) Air pollution laws b) Gravity settling chambers c) Scrubbers d) Bhopal gas tragedy e) Air pollution index f) Emission inventories.

(4×5=20)

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