NPTEL Air Pollution and Control Assignment 4 Answers 2023

Hello NPTEL Learners, In this article, you will find NPTEL Air Pollution and Control Assignment 4 Week 4 Answers 2023. All the Answers are provided below to help the students as a reference don’t straight away look for the solutions, first try to solve the questions by yourself. If you find any difficulty, then look for the solutions.

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NPTEL Air Pollution and Control Assignment 4 Answers 2023:

• m
• m/s
• g/s
• μg/m3

Q.2. Which of the following assumptions are associated with the Gaussian plume model?

I.  There is no diffusion in the X-direction
II.  Uniform continuous emission rate
III.  The shape of the plume is conical
IV.  The pollutants are non-reactive gases or aerosol

• I & III
• II & IV
• II, III & IV
• I, II, III, & IV

Q.3. The expression for the determination of concentration (C) of a pollutant using the Gaussian dispersion model for a line source is given as:

The above equation is generally used if

• Φ = 0°
• Φ = 20°
• Φ > 20°
• Φ < 20°

Q.4. What is/are the disadvantages of using the gaussian plume model for area sources?

I. Require large amounts of input information II. Consume large amounts of computer time III. Involves complexity

• I
• II & IV
• I & III
• I, II, & III

Q.5.The buoyancy flux parameter (F) is utilized to calculate the effective height of the stack. The formula for the buoyancy flux parameter (F) is given below:

Where,

Vs = Exit velocity Ds = Stack Diameter

Ts = Exit Temperature Ta = Ambient air temperature

The unit of F is

• m2/s
• m4/s2
• m4/s3
• m4/s4

Q.7. A part of the atmosphere that behaves in a coherent way concerning the dispersion of air pollutants is known as

• Pollution potential
• Atmospheric stability
• Ventilation Coefficient
• Airshed

Q.8. The available assimilation capacity (AAC) is given as

• AAC = Permissible Standard (NAAQS) – Ambient Pollutant concentration
• AAC = Permissible Standard (NAAQS) + Ambient Pollutant concentration
• AAC = Permissible Standard (NAAQS) x Ambient Pollutant concentration
• AAC = Permissible Standard (NAAQS) / Ambient Pollutant concentration

Q.9. The basic equation for emission estimation is

• Emission = Emission Factor – Activity Data
• Emission = Emission Factor + Activity Data
• Emission = Emission Factor × Activity Data
• Emission = Emission Factor / Activity Data

Q.10.The comprehensive stock of all the pollution-emitting sources and emissions in a given region with a specific time period is called

• Emission inventory
• Emission factor
• Emission correction coefficient
• Emission norm
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About NPTEL Air Pollution and Control Course:

The objective of the course is to impart the knowledge and understanding of causes and effects of air pollution and their controlling mechanisms. The course will provide a deeper understanding of air pollutants, pollution inventory and modelling. The course also imparts knowledge on the impacts of air pollution on different aspects such as policy, human health and various contemporary technological innovation for betterment of air quality.

Course Outcome:
• Week 1 : Air Pollution: Introduction and Impacts of air pollution on human health, vegetation, animals, building materials, structures, and atmosphere, soil and water bodies.
• Week 2 : Sources, classification and formation/transformation of air pollutants: Meteorology and Atmospheric Stability.
• Week 3 : Lapse Rate, Plume Behaviour, and Air Quality Monitoring, Air Quality Index (AQI)
• Week 4 : Air Quality Modelling, Gaussian dispersion models: point, line and area source models
• Week 5 : Emissions Inventory: Transport, Industrial, Agricultural, Residential and Commercial sectors
• Week 6 : Application of Remote sensing/Satellite based data in emission inventory, Source apportionment using receptor modelling.
• Week 7 : Indoor air pollution: sources, types and health impacts. Sampling, assessment and evaluation of Indoor air quality.
• Week 8 : Global and regional environmental issues of air pollution: Ozone depletion, Climate change, Global warming, Acid rain.
• Week 9 : Air pollution control devices, equipment and their design.
• Week 10 :  Air pollution emission standards, National and international policies, acts, rules and regulations.
• Week 11 : Emerging technologies and strategies to mitigate air pollution, Current challenges and way forward.
• Week 12 : Lab-based measurements of air pollutants.
CRITERIA TO GET A CERTIFICATE:

Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

If you have not registered for exam kindly register Through https://examform.nptel.ac.in/