NPTEL Air Pollution and Control Week 10 Solutions

This set of MCQ(multiple choice questions) focuses on the NPTEL Air Pollution and Control Week 10 Solutions

Course layout

Week 0: Assignment Solutions
Week 1: Assignment Solutions

Week 2: Assignment Solutions
Week 3: Assignment Solution
Week 4: Assignment Solutions
Week 5: Assignment Solutions
Week 6: Assignment Solutions
Week 7: Assignment Solutions
Week 8: Assignment Solutions
Week 9: Assignment Solutions
Week 10: Assignment Solutions
Week 11: Assignment Solutions
Week 12: Assignment Solutions

NOTE: You can check your answer immediately by clicking show answer button. Moreover, this set of “NPTEL Air Pollution and Control Week 10 Solutions” contains 10 questions.

NPTEL Air Pollution and Control Week 10 Solutions

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

Answer: c) 80.85 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. 

a) 0.00241 m/min
b) 0.0241 m/min
c) 0.241 m/min
d) 2.411 m/min

Answer: c) 0.241 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%.

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

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.

a) 88.58 %
b) 90.66 %
c) 98.87 %
d) 99.88 %

Answer: d) 99.88 %

NPTEL Air Pollution and Control Week 10 Solutions

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

a) 20
b) 40
c) 60
d) 80

Answer: b) 40

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

a) Ozone
b) Benzene
c) Arsenic
d) Cadmium

Answer: d) Cadmium

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

a) Bombay smoke nuisance act
b) Bengal smoke nuisance act
c) Motor vehicles act
d) Factories act

Answer: b) Bengal smoke nuisance act

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. 

a) 25%
b) 30%
c) 40%
d) 50%

Answer: d) 50%

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

a) BS-I to BS-III
b) BS-II to BS-IV
c) BS-III to BS-V
d) BS-IV to BS-VI

Answer: d) BS-IV to BS-VI

NPTEL Air Pollution and Control Week 10 Solutions

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.

a) 2020
b) 2019
c) 2018
d) 2017

Answer: d) 2017

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