NPTEL Air Pollution and Control Week 9 Assignment Answers 2025
1. Which pollutant is most commonly associated with vehicular emissions?
- Lead
- Nitrogen oxides (NOx)
- Ozone
- Radon
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2. Which device is fitted in vehicles to control air pollution from the tailpipe emissions:
- Electrostatic precipitator
- Catalytic converter
- Bag filter
- Cyclone separator
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3. What is the primary function of cyclone separators in air pollution control?
- Capture gaseous pollutants
- Remove large particulate matter from emissions
- Neutralize sulfur dioxide emissions
- Increase air circulation rates
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4. What is the primary purpose of baghouse filters in industrial settings?
- Remove gaseous pollutants from emissions
- Capture fine particulate matter
- Reduce nitrogen oxides (NOx) levels
- Increase the velocity of exhaust gases
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5. Which air pollution control device is best suited for removing fine mist and liquid droplets?
- Cyclone separator
- Wet scrubber
- Ionizer
- Baghouse filter
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6. Biofiltration can be classified as a special type of absorption system that uses irreversible processes to control gaseous contaminants.
- True
- False
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7. The adsorption process is classified as either physical or chemical. The type of force involved in physical adsorption is
- Chemical interaction
- Van der Waal force
- Centrifugal force
- No force is involved
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8. Which of the following technique is adopted when the contaminant concentration is high enough to make a recovery feasible and economical.
- Biofiltration
- Oxidation
- Condensation
- Absorption
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9. Which technology is used to control odorous emissions from wastewater treatment plants?
- Biofilters
- Cyclones
- Baghouse filters
- Catalytic converters
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10. Gasoline fumes evaporating from the fuel tank and carburetor are vented directly into the atmosphere. These emissions are significantly reduced by:
- The air-injection system
- Catalytic converter
- Positive crankcase ventilation valve
- Evaporative control system
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