Air Pollution and Control Week 4 Nptel Quiz Answers
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Air Pollution and Control Week 4 Nptel Quiz Answers (Jan-Apr 2025)
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Q1. Which of the following formula is given for calculating the mean wind speed at plume height?
- u(z) = u₀(z₀/z)
- u(z) = u₀(z₀/z)^p
- u(z) = u₀(z/z₀)
- u(z) = u₀(z/z₀)^p
Q2. How does the wind angle direction with respect to the receptor affect the total concentration of air pollutants?
a) It increases with an increase in wind angle direction.
b) It remains constant regardless of wind angle direction.
c) It decreases as the wind angle direction increases.
d) It is unaffected by the wind angle direction.
Q3. The expression for the determination of concentration (C) of a pollutant using the Gaussian dispersion model for a line source is given as:
What is the standard unit of the (σz) standard deviation in the given equation?
a) meter/second (m/s)
b) gram/second (g/s)
c) meters (m)
d) micrograms/cubic meters (μg/m³)
Q4. The initial spread for the interpretation of the area source is given as:
a) σyo = S/1.2
b) σyo = S/2.2
c) σyo = S/3.2
d) σyo = S/4.2
Q5. On a highway, a lot of vehicles traveling daily release harmful chemical emissions. Consider the average emission rate from the vehicles of a pollutant P1 as 0.05 g/s. Determine the total chemical concentration of pollutant P1 at a point 600 m downwind from the highway on an overcast day. Let the wind be perpendicular to the highway with a speed of 5 m/s. The number of vehicles per unit length (in m) is 0.18 m.
a) 1.44 μg/m³
b) 14.44 μg/m³
c) 2.88 μg/m³
d) 28.88 μg/m³
Q6. What does “assimilative capacity” of air environment refer to?
a) The amount of pollution that can be discharged without violating water standards
b) The maximum amount of pollution that can be discharged without violating air quality standards
c) The ability of air to remain stagnant without pollutants spreading
d) The rate at which pollutants are produced in an industrial area
Q7. What does a higher ventilation coefficient indicate?
a) Poor air quality due to stagnation
b) Inefficient dispersal of pollutants
c) Efficient atmospheric dispersion and better air quality
d) Increased levels of hazardous pollution
Q8. The height of the layer in which air pollutants or any constituents emitted or entrained into it is vertically dispersed due to turbulence and convection; it is called:
a) Mixing height
b) Effective height
c) Plume rise
d) Ventilation coefficient
Q9. How is the emission factor (EF) expressed?
a) As the ratio of pollutants to air quality index
b) As mass of pollutants divided by a volume or weight of raw material
c) As the proportion of emission to meteorological variations
d) As the concentration of pollutants in the mixing layer
Q10. What does a gridded emission inventory provide?
a) Information on global wind patterns
b) Locational information of emissions of air pollutants and their sources
c) Data on rainfall and its effect on pollution
d) The chemical composition of pollutants in the atmosphere
Air Pollution and Control Week 4 Nptel Quiz Answers (Jan-Apr 2025)
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