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GUJARAT TECHNOLOGICAL UNIVERSITYBE - SEMESTER- VI (New) EXAMINATION — WINTER 2019
Subject Code: 2161302 Date: 04/12/2019
Subject Name: Fundamentals of Air Pollution
Time: 02:30 PM TO 05:00 PM Total Marks: 70
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Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Classify air pollutants into different categories and indicate their sources. [03]
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(b) What are the important factors which contribute to air pollution? [04](c) Explain the effects of NOx on Environment. [07]
Q.2 (a) Define: [03]
1. Traverse points 2. Isokinetic condition 3. Representative sample.
(b) Differentiate between stack standards and ambient standards. [04]
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(c) Explain the guidelines for sampling and analysis of SO2 in ambient air with the help of flow chart. [07]OR
(c) Explain the procedure of the particulate matter sampling from stack with diagram. [07]
Q.3 (a) Differentiate between fumigation and lofting. [03]
(b) Write a short note on MMD. [04]
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(c) Derive the equation of DALR ( -dT/dz) =9.8°C. [07]OR
Q.3 (a) Differentiate between Super adiabatic and sub adiabatic condition. [03]
(b) Write a short note on Wind velocity profile. [04]
(c) Enlist the factors affecting the dispersion of pollutants in the atmosphere? Note down the advantages and disadvantages of Gaussian Model. [07]
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Q.4 (a) Define following terms: [03]
1. Convective Turbulence 2. Downwind 3. Dispersion
(b) Briefly explain applications of windrose diagram. [04]
(c) Find out the flow of flue gas and particulate matter concentration in mg/Nm³. Type of fuel is lignite (Mata no madh), fuel consumption is 5 T/day. Assume suitable data. [07]
OR
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Q.4 (a) Define following terms: [03]1. Mechanical Turbulence 2. Sea breeze 3. Trapping
(b) Differentiate between Subsidence and Radiation inversion. [04]
(c) The result of stack monitoring report for the thermal power plant are as shown below: [07]
| Stack No. | SO2 Concentration | NO2 Concentration |
|---|---|---|
| 1 | 200 | 2 |
| 2 | 400 | 1.5 |
| 3 | 600 | 1.2 |
| 4 | 700 | 3.5 |
| Stack limit | 100 ppm | 50 ppm |
Determine whether an emission exceeds the limits specified by pollution control authority.
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Q.5 (a) Express 30µg/m³ and 1.5 µg/m³ of SO2 in ppm. [03]
(b) How to reduce the odor from the point sources? Explain any one method in detail. [04]
(c) Write a short note on characteristics of sound. [07]
OR
Q.5 (a) A diesel vehicle emits 4% carbon monoxide by volume. Determine its concentration in g/m³ at 25°C and 1 atmosphere pressure. [03]
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(b) What is decibel? Explain in detail. Why it is used? [04](c) Define odour and explain sources of odour. [07]
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