# NPTEL Air pollution and Control Week 4 Assignment Answers 2024

## NPTEL Air pollution and Control Week 4 Assignment Answers 2024

1. What is assumed in the Gaussian Plume Model regarding the time required for pollutants to travel to the receptor?

• Wind speed variations
• Molecular Diffusion
• Buoyancy effects
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2. What is an advantage of the Gaussian Plume Model regarding its response time?

• Slow response time
• Immediate response time
• Time-consuming calculations
• Dependence on supercomputers
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3. What is the assumed ground condition in deriving the expression for pollutant concentration from a line source?

• Elevated surface
• Uneven terrain
• Ground level surface
• Water surface
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4. In what direction is the wind assumed to be blowing in the context of the line source model?

• Parallel to the line
• Perpendicular to the line
• Diagonal to the line
• Variable direction
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6. What is the potential consequence of low ventilation coefficient?

• Improved air quality
• Stagnation and poor air quality
• Increased assimilative capacity
• Enhanced pollutant disposal
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7. 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

• Mixing height
• Effective height
• Plume rise
• Ventilation coefficient
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8. The available assimilation capacity (AAC) is given as

• AAC = Permissible Standard (NAAQS) – Ambient Pollutant concentration
• AAC = Permissible Standard (NAAQS) + Ambient Pollutant concentration
• AAC = Permissible Standard (NAAQS) x Ambient Pollutant concentration
• AAC = Permissible Standard (NAAQS) / Ambient Pollutant concentration
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9. The basic equation for emission estimation is

• Emission = Emission Factor – Activity Data
• Emission = Emission Factor + Activity Data
• Emission = Emission Factor × Activity Data
• Emission = Emission Factor / Activity Data
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10. What does an Emission Factor (EF) represent in the context of air pollution modelling?

• Random emission data
• Mass of pollutants released per unit volume of raw material
• Dispersion coefficient
• Gridded emission inventory
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