NPTEL Air Pollution and Control Week 9 Solutions

This set of MCQ(multiple choice questions) focuses on the NPTEL Air Pollution and Control Week 9 Solutions

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NPTEL Air Pollution and Control Week 9 Solutions

Q1. Which of the following devices is not used to control gases from stationary sources?

a) Spray tower
b) Packed towers
c) Venturi-scrubbers
d) Fabric filters

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Q2. Select the suitable device used to control industrial dust emissions?

a) Settling Chamber
b) Catalytic converter
c) Positive crankcase ventilation valve
d) All of the above

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Q3. From the cost and removal efficiency perspective, which of the following pollutant control devices is preferred for effective removal of the particulates above 40 µm in size?

a) Inertial Separators
b) Cyclonic Separators
c) Settling Chamber
d) Electrostatic Precipitators

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Q4. What is the principal particle collection mechanism used in venturi scrubbers?

a) Brownian motion
b) Electrostatic attraction
c) Inertial impaction 
d) Coagulation

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NPTEL Air Pollution and Control Week 9 Solutions

Q5. Which of the following statements is incorrect for the fabric filter?

a) Cleaning is required at regular intervals for efficient operation.
b) Improper filter media increases the collection efficiency.
c) The normal velocity of airflow through the bags is 0.4-1 m/min.
d) The air-to-cloth ratio is the main sizing parameter used for the fabric filter.

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Q6. The collection efficiency of the ESP is given by the Deutch-Anderson equation, when η = fractional collection efficiency, ω = drift velocity (m/sec), A = Available collection area, (m²), Q = volumetric flow rate (m³/sec)

a) η = 1 – e^(wA/Q)
b) η = 1 + e^(-wA/Q)
c) η = 1 – e^(-wA/Q)
d) η = 1 + e^(wA/Q)

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Q7. The quantity of recirculation liquid used in the absorber divided by the outlet gas flow rate is called______________.

a) Gas-to-liquid ratio
b) Absorption efficiency 
c) Liquid-to-gas ratio
d) Adsorption efficiency

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Q8. Biofiltration can be classified as a special type of absorption system using _____________processes to control the gaseous contaminant.

a) Reversible
b) Irreversible
c) Equilibrium 
d) Reversible and irreversible 

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Q9. Which of the following primary forces is responsible for the particle collection in cyclone collectors?

a) Electrostatic
b) Brownian Diffusion
c) Centrifugal
d) Gravitational 

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NPTEL Air Pollution and Control Week 9 Solutions

Q10. 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

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