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