# 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, Ï‰ = 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.

a) 0.00241 m/min
b) 0.0241 m/min
c) 0.241 m/min
d) 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%.

a) 0.04 lb/hr
b) 1.01 lb/hr
c) 2.54 lb/hr
d) 9.6 lb/hr

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

a) 88.58 %
b) 90.66 %
c) 98.87 %
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 Âµg/m3)  is given as:

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

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

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 â€“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%

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

NPTEL Air Pollution and Control Week 10 Solutions

Q10. National Clean Air Programme (NCAP) launched in 2019 targets to reduce 20 % â€“ 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