NPTEL Air pollution and Control Week 12 Assignment Answers 2024

NPTEL Air pollution and Control Week 12 Assignment Answers 2024

1. For which of the following pollutants, a Polytetrafluoroethylene (PTFE) filter paper is used in the sampling and analysis by gravimetric method?

  • PM10
  • PM2.5
  • SO2
  • NO2
Answer :- 

2. Which method is used in sampling and analysis of PM2.5 in ambient air?

  • Gravimetric method
  • Improved West and Gaeke method
  • Modified Jacob and Hochheiser method
  • UV Photometric
Answer :- 

3. Which of the following is used to calibrate to zero of the spectrophotometers during sampling and analysis of SO2/NO2?

  • Aliquot
  • Reagent blank
  • Absorbing media
  • Distilled water
Answer :- 

4. According to National Ambient Air Quality Standards (NAAQS), the permissible value for annual concentration of SO2 in Ecologically Sensitive Area (Notified by Central Government) is __________.

  • 10 μg/m3
  • 20 μg/m3
  • 40 μg/m3
  • 60 μg/m3
Answer :- 

5. Sampling, at such a rate that the velocity and the direction of the gas entering the sampling nozzle is the same as that of the gas in the duct/stack at the same sampling point, is known as

  • Isothermal sampling
  • Isokinetic sampling
  • Adiabatic sampling
  • Differential sampling
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6. To ensure a representative sample, which energy of the gas stream in the stack should be equal to energy of the gas stream through the sampling nozzle?

  • Thermal energy
  • Kinetic energy
  • Potential energy
  • Electrical energy
Answer :- 

7. Which of the following pollutants is NOT measured using the MultiGas Monitor?

  • Carbon Monoxide (CO)
  • Carbon Dioxide (CO2)
  • Particulate Matter (PM10)
  • Volatile Organic Compounds (VOCs)
Answer :- 

8. Which of the following parameters is measured using the non-dispersive infrared spectroscopy in multi gas monitor.

  • Temperature
  • Percent Relative Humidity (%RH)
  • Carbon Monoxide (CO)
  • Carbon Dioxide (CO2)
Answer :- 

9. The maximum time interval for monitoring of the particulate matter using the spectrometer software is:

  • 60 minutes
  • 30 minutes
  • 15 minutes
  • 10 minutes
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10. The principle of the method involved in the measurement of particulate matter in a spectrometer is:

  • Scattering of light
  • Gravimetric
  • Chemical method
  • UV photometric
Answer :- 

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