NPTEL Air Pollution and Control Week 10 Assignment Answers 2024

Introduction to NPTEL

NPTEL (National Programme on Technology Enhanced Learning) is an initiative by the Indian government to enhance the quality of engineering education through online courses. It provides e-learning resources to students and faculty across various engineering disciplines.

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Calculate the minimum size of the particle that will be removed with 100 percent efficiency from the gravitational settling chamber under the following conditions:

Air: (i) Horizontal velocity is 1.1 m/s (ii) Temperature is 75⁰C

Particle: (i) Specific gravity = 1.5  (ii) Density of the particle,  = 1.5g/cm3 = 1500 kg/m3

Chamber: (i) Length = 15 m  (ii) Height = 1.7 m     

At 75⁰C viscosity of air is 2.3 x 10-5 kg/m-s. (Take g = 9.81 m/s-2)   

 67.9 µm

 59.2 µm

 35.2 µm

 13.9 µm

1 point

An electrostatic precipitator, in which the collection plate area is 120 m2, collection efficiency is 99.94 %, and the migration velocity is 0.25 m/s, will have the gas flow rate 

 1.5 m3/s

 4  m3/s

 6.7 m3/s

 13 m3/s

1 point

What is the maximum toluene removal efficiency possible in a refrigeration-type condenser operating at -100°F if the inlet concentration is 8,000 ppm? Given the outlet partial pressure @ -100°F for toluene is 0.015 mm Hg. 

 85 %

 90.5 %

 95.1 %

 99.7  %

1 point

Calculate the amount of calcium hydroxide (lime) needed to neutralize the HCl (Hydrochloric acid) absorbed from a gas stream having 30 ppm HCl and a flow rate of 15,000 SCFM (Standard Cubic Feet per Minute). Assume an HCl removal efficiency of 98%.

 0.04 lb/hr

 1.01 lb/hr

 2.54 lb/hr

 9.6 lb/hr

1 point

Which of the following pollutants was added to revision revised National Ambient Air Quality Standards (NAAQS) of India in 2009?

 Lead

 Carbon dioxide

 Ozone

 Ammonia

1 point

According to air quality guidelines of WHO (2021), SO2 concentration (24 hours) has increased from 20 µg/m3 to ______ µg/m3? 

 30

 40

 50

 60

1 point

According to the Ringelmann chart method, a visual assessment method for smoke emissions, if the Ringelmann number is 4, it represents:

 20 % opacity – barely visible smoke

 40 % opacity – clearly visible smoke

 60 % opacity – somewhat transparent smoke

 80 % opacity – barely transparent smoke

1 point

Which of the following acts serves as an umbrella act under which various rules and notifications have been framed and issued to take care of the different dimensions of environmental challenge.

 Air (Prevention and Control of Air Pollution) Act (Air Act, 1981)

 Environment (Protection) Act (EPA), 1986

 National Environment Tribunal Act (NETA), 1995

 National Environment Appellate Authority (NEAA), 1997

1 point

If the air quality index of any region is observed to be 384, the air quality of the region is:

 Good

 Satisfactory

 Poor

 Very Poor

1 point

Which of the following plans aims to achieve national fuel security by promoting hybrid and electric vehicles in the country.

 National Electric Mobility Mission Plan

 National Clean Air Programme

 National air quality index

 None of these

ChatGPT

Calculate the minimum size of the particle that will be removed with 100 percent efficiency from the gravitational settling chamber under the following conditions:

Options:

a) 67.9 µm

b) 59.2 µm

c) 35.2 µm

d) 13.9 µm

Answer: c) 35.2 µm

An electrostatic precipitator, in which the collection plate area is 120 m2, collection efficiency is 99.94 %, and the migration velocity is 0.25 m/s, will have the gas flow rate:

Options:

a) 1.5 m3/s

b) 4 m3/s

c) 6.7 m3/s

d) 13 m3/s

Answer: b) 4 m3/s

What is the maximum toluene removal efficiency possible in a refrigeration-type condenser operating at -100°F if the inlet concentration is 8,000 ppm? Given the outlet partial pressure @ -100°F for toluene is 0.015 mm Hg.

Options:

a) 85%

b) 90.5%

c) 95.1%

d) 99.7%

Answer: d) 99.7%

Calculate the amount of calcium hydroxide (lime) needed to neutralize the HCl (Hydrochloric acid) absorbed from a gas stream having 30 ppm HCl and a flow rate of 15,000 SCFM (Standard Cubic Feet per Minute). Assume an HCl removal efficiency of 98%.

Options:

a) 0.04 lb/hr

b) 1.01 lb/hr

c) 2.54 lb/hr

d) 9.6 lb/hr

Answer: c) 2.54 lb/hr

Which of the following pollutants was added to revision revised National Ambient Air Quality Standards (NAAQS) of India in 2009?

Options:

a) Lead

b) Carbon dioxide

c) Ozone

d) Ammonia

Answer: d) Ammonia

According to air quality guidelines of WHO (2021), SO2 concentration (24 hours) has increased from 20 µg/m3 to ______ µg/m3?

Options:

a) 30

b) 40

c) 50

d) 60

Answer: c) 50

According to the Ringelmann chart method, a visual assessment method for smoke emissions, if the Ringelmann number is 4, it represents:

Options:

a) 20% opacity – barely visible smoke

b) 40% opacity – clearly visible smoke

c) 60% opacity – somewhat transparent smoke

d) 80% opacity – barely transparent smoke

Answer: c) 60% opacity – somewhat transparent smoke

Which of the following acts serves as an umbrella act under which various rules and notifications have been framed and issued to take care of the different dimensions of environmental challenge?

Options:

a) Air (Prevention and Control of Air Pollution) Act (Air Act, 1981)

b) Environment (Protection) Act (EPA), 1986

c) National Environment Tribunal Act (NETA), 1995

d) National Environment Appellate Authority (NEAA), 1997

Answer: b) Environment (Protection) Act (EPA), 1986

If the air quality index of any region is observed to be 384, the air quality of the region is:

Options:

a) Good

b) Satisfactory

c) Poor

d) Very Poor

Answer: d) Very Poor

Which of the following plans aims to achieve national fuel security by promoting hybrid and electric vehicles in the country?

Options:

a) National Electric Mobility Mission Plan

b) National Clean Air Programme

c) National air quality index

d) None of these

Answer: a) National Electric Mobility Mission Plan

Overview of Air Pollution and Control Course

The Air Pollution and Control course offered by NPTEL aims to educate learners about the causes, effects, and mitigation strategies of air pollution. It covers topics such as sources of pollution, atmospheric dynamics, and regulatory measures.

Importance of Week 10 Assignment

The Week 10 Assignment serves as a comprehensive assessment tool to evaluate students' understanding of the course material. It challenges learners to apply theoretical knowledge to practical scenarios, enhancing their critical thinking and problem-solving skills.

Understanding Week 10 Assignment Requirements

Before delving into the assignment questions, it's crucial to grasp the underlying concepts and objectives. Analyzing the requirements carefully ensures that answers are relevant and accurate, maximizing the chances of scoring well.

Key Concepts Covered in Week 10 Assignment

The Week 10 Assignment typically focuses on advanced topics related to air pollution and control. It may include areas such as atmospheric dispersion modeling, pollutant transport mechanisms, and case studies on environmental impact assessment.

Strategies for Solving Week 10 Assignment

To excel in the Week 10 Assignment, students should adopt a systematic approach. This involves breaking down complex problems into manageable parts, conducting thorough research, and utilizing analytical tools and software where applicable.

Sample Answers for Week 10 Assignment Questions

Question: Discuss the significance of atmospheric inversion in air pollution dispersion modeling.

Answer: Atmospheric inversion plays a crucial role in air pollution dispersion modeling by trapping pollutants close to the surface. It hinders vertical mixing, leading to the accumulation of pollutants in the lower atmosphere...

Question: Explain the principles of electrostatic precipitation for particulate matter control.

Answer: Electrostatic precipitation relies on the principle of electrostatic attraction to remove particulate matter from industrial exhaust gases...

Importance of Environmental Awareness

The Week 10 Assignment also serves as a platform to raise awareness about environmental issues. By grappling with real-world challenges, students gain a deeper appreciation for the importance of environmental conservation and sustainable development.

Impact of Air Pollution on Health

Air pollution poses significant risks to human health, ranging from respiratory ailments to cardiovascular diseases and even premature death. It underscores the urgency of implementing effective pollution control measures to safeguard public health.

Technologies for Air Pollution Control

Innovative technologies such as scrubbers, catalytic converters, and biofiltration systems offer promising solutions for mitigating air pollution. These technologies aim to reduce emissions of harmful pollutants and minimize environmental impact.

Conclusion

The Week 10 Assignment of the NPTEL Air Pollution and Control course plays a pivotal role in assessing students' comprehension and application of course concepts. By tackling challenging problems and exploring practical solutions, learners not only deepen their understanding of air pollution issues but also contribute to environmental stewardship.

FAQs

What is NPTEL?

NPTEL (National Programme on Technology Enhanced Learning) is an initiative by the Indian government to provide high-quality e-learning resources in engineering and other technical disciplines.

How does the Week 10 Assignment contribute to learning?

The Week 10 Assignment assesses students' understanding of advanced concepts in air pollution and control, fostering critical thinking and problem-solving skills.

Can I get help with my Week 10 Assignment?

While seeking guidance from peers or instructors is encouraged, it's essential to ensure that answers are original and reflect individual understanding.

Why is it crucial to control air pollution?

Controlling air pollution is vital to safeguarding public health, preserving ecosystems, and mitigating climate change's adverse effects.

Where can I find more resources on air pollution and control?

NPTEL offers a plethora of online courses and supplementary materials on air pollution and control, providing comprehensive resources for learners.