NPTEL Air Pollution and Control Assignment 10 Answers

NPTEL Air Pollution and Control Assignment 10 Answers 2022:- All the Answers are 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 Assignment 10 Answers 2022:-

Q1. Find the collecting plate area in a horizontal flow, single-stage electrostatic precipitator (ESP) handling an average gas flow of 3.1 m3/s  from a pulverized coal-fired boiler. The required collection efficiency of ESP is 98%. Take drift velocity, ω = 15 cm/sec.

a. 0.189 m2
b. 64.92 m2
c. 80.85 m2
d. 94.54 m2

Q2. A baghouse filter is having 30 compartments, 220 bags per compartment, and each bag of diameter 12 m and bag length 25 m, with a gas flow rate of 1,500,000 m3/min. Calculate the gross air to cloth ratios.

• 0.00241 m/min
• 0.0241 m/min
• 0.241 m/min
• 2.411 m/min

Q3. 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

Q4. What is the maximum toluene removal efficiency possible in a refrigeration-type condenser operating at -125°F if the inlet concentration is 21,000 ppm? Given the outlet partial pressure @ -125°F for toluene is 0.018 mm Hg.

• 88.58 %
• 90.66 %
• 98.87 %
• 99.88 %

Q5. According to the recently published WHO air quality guidelines, 2021, the permissible limit of SO2 (in µg/m3)  is given as:

• 20
• 40
• 60
• 80

Q6. Which of the following pollutants is not included in the revised National Ambient Air Quality Standard (NAAQS, 2009):

Q7. Which of the following Acts is considered as the first act/regulation enacted to address the issue of air pollution:

Q8. According to the notification for e –vehicles for NCR in 2022, the Transport Department, Government of NCT of Delhi is directed to ensure that all the aggregators and delivery service providers should adopt electric vehicles (two-wheelers) in the proportion of ______ within 31st March 2023.

Q9. Ministry of Road Transport and Highways (MoRTH) decided to move directly from ____________emission standards by 2020

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Q10. National Clean Air Programme (NCAP) launched in 2019 targets to reduce 20 % – 30 % of PM2.5 and PM10  concentration by 2024, keeping ______ as the base year for the comparison of concentration.