NPTEL Air Pollution and Control Assignment 9 Answers 2022:- All the Answers provided here to help the students as a reference, You must submit your assignment at your own knowledge.
What is Air Pollution and Control?
The objective of the course is to impart knowledge and understanding of the causes and effects of air pollution and its controlling mechanisms. The course will provide a deeper understanding of air pollutants, pollution inventory, and modeling. The course also imparts knowledge on the impacts of air pollution on different aspects such as policy, human health, and various contemporary technological innovations for the betterment of air quality.
CRITERIA TO GET A CERTIFICATE
Average assignment score = 25% of the 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 THE 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.
| NPTEL Air Pollution and Control | Answer |
| Assignment 1 | Click Here |
| Assignment 2 | Click Here |
| Assignment 3 | Click Here |
| Assignment 4 | Click Here |
| Assignment 5 | Click Here |
| Assignment 6 | Click Here |
| Assignment 7 | Click Here |
| Assignment 8 | Click Here |
| Assignment 9 | Click Here |
| Assignment 10 | Click Here |
| Assignment 11 | NA |
| Assignment 12 | NA |
NPTEL Air Pollution and Control Assignment 9 Answers 2022:-
Q1. Which of the following devices is not used to control gases from stationary sources?
a. Spray tower
b. Packed towers
c. Venturi-scrubbers
d. Fabric filters
Answer:- d. Fabric filters
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Q2. Select the suitable device used to control industrial dust emissions?
- Settling Chamber
- Catalytic converter
- Positive crankcase ventilation valve
- All of the above
Answer: a. Settling Chamber
Q3. From the cost and removal efficiency perspective, which of the following pollutant control devices is preferred for effective removal of the particulates above 40 ยตm in size?
- Inertial Separators
- Cyclonic Separators
- Settling Chamber
- Electrostatic Precipitators
Answer: c. Settling Chamber
Q4. What is the principal particle collection mechanism used in venturi scrubbers?
- Brownian motion
- Electrostatic attraction
- Inertial impaction
- Coagulation
Answer: c. Inertial impaction
Q5. Which of the following statements is incorrect for the fabric filter?
- Cleaning is required at regular intervals for efficient operation.
- Improper filter media increases the collection efficiency.
- The normal velocity of airflow through the bags is 0.4-1 m/min.
- The air-to-cloth ratio is the main sizing parameter used for the fabric filter.
Answer: b. Improper filter media increases the collection efficiency.
๐FOR NEXT WEEK ASSIGNMENT ANSWERS๐
Q6. The collection efficiency of the ESP is given by the Deutch-Anderson equation, when ฮท = fractional collection efficiency, ฯ = drift velocity (m/sec), A = Available collection area, (m2), Q = volumetric flow rate (m3/sec)
Answer:- c
Q7. The quantity of recirculation liquid used in the absorber divided by the outlet gas flow rate is called______________.
- Gas-to-liquid ratio
- Absorption efficiency
- Liquid-to-gas ratio
- Adsorption efficiency
Answer: c. Liquid-to-gas ratio
Q8. Biofiltration can be classified as a special type of absorption system using _____________processes to control the gaseous contaminant.
- Reversible
- Irreversible
- Equilibrium
- Reversible and irreversible
Answer: b. Irreversible
Q9. Which of the following primary forces is responsible for the particle collection in cyclone collectors?
- Electrostatic
- Brownian Diffusion
- Centrifugal
- Gravitational
Answer: c. Centrifugal
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Q10. Which device is fitted in vehicles to control air pollution from the tailpipe emissions:
- Electrostatic precipitator
- Catalytic converter
- Bag filter
- Cyclone separator
Answer: b. Catalytic converter
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NPTEL Air Pollution and Control Assignment 9 Answers 2022:- All the Answers provided here to help the students as a reference, You must submit your assignment at your own knowledge.