This set of Air Pollution Control Multiple Choice Questions & Answers (MCQs) focuses on “Particulate Emission Control”.
1. Particulate matter is made up of various components. What are they?
a) Suspended particles
b) Metals
c) Dust
d) Fumes
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Explanation: Particulate matter in emissions from the industries contains minute particles that are suspended in the air. These particles may be composed of metals and their compounds, dust, fumes, among other substances.
2. What is the upper limit of particulate sizes released from industries?
a) 1 micrometre
b) 100 micrometre
c) 50 micrometre
d) 10 micrometre
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Explanation: Generally, the size of particulates released from industries has a varied size range. The upper limit is usually about 100 micrometre, while the lower limit is 0.1 micrometre and sometimes even smaller.
3. Which of the following is a factor upon which the choice of equipment for particulate collection depends?
a) Hazardous nature
b) Emission standards
c) Particulate size
d) Pollution causing potential
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Explanation: Particulate size is a factor which affects the choice of equipment. Naturally, if the equipment has a low collection efficiency for the desired particulate size, it is not chosen for recovery. Other such factors include characteristics of particulates, and concentration, et cetera.
4. Which of the following is not a factor considered for the choice of particulate recovery equipment?
a) Physical characteristics of particulates
b) Concentration of particulates in the gas
c) Temperature of gas to be handled
d) Capacity of gas to be handled
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Explanation: The factors upon which the choice of equipment depends are many. A few are physical and chemical characteristics of the particulates, their concentration, and the gas temperature. The capacity of the gas, however, is not a factor.
5. Which factors must be considered when evaluating the collection efficiency of particulates?
a) Inflammability of particulates
b) Price of the equipment
c) Size of particulates
d) Emission standards
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Explanation: The factor that needs to be considered when estimating collection efficiency is the inflammability of the particulates. Another such factor is particulate toxicity. The reason is that if the particulates are hazardous, then their collection becomes vital.
6. Which of the following are working principles used to remove particulates from emission streams?
a) Coagulation
b) Centrifugal impaction
c) Biological reaction
d) Absorption
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Explanation: Among the given options, only centrifugal impaction is a working principle of the machines designed to collect particulates. Coagulation and biological reactions are principles used for the collection of materials from wastewater.
7. Which of the following equipment is not used to collect particulates in industries?
a) Gravity settlers
b) Electrostatic precipitators
c) Absorbers
d) Cyclone separators
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Explanation: Among the given options, only absorbers are not used for the collection of particulates. Such devices are reserved for gaseous emissions. Other tools utilised for particulate collection are solid traps and fabric filters.
8. Among the tools available for particulate collection, which of the following is not preferred?
a) Fabric filters
b) Electrostatic precipitators
c) Wet scrubbers
d) Gravitational settlers
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Explanation: Among the given options, gravitational settlers are not preferred as equipment for collecting particulates. Gravity settlers have low efficiencies, especially when it comes to recovering particles of very small sizes. Another such tool is cyclone separators.
9. Which of the following particulate recovery tools are suitable for practical applications?
a) Absorbers
b) Cyclone separators
c) Gravity settlers
d) Fabric filters
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Explanation: Absorbers are not used for the collection of particulates. Gravity settlers and cyclone separators are not preferred for low collection efficiency. Fabric filters and electrostatic precipitators are suitable for practical applications since they can readily meet emission standards.
10. Which of the following is not a working principle utilised in the machines collecting particulates?
a) Adsorption
b) Electrostatic precipitation
c) Inertial impaction
d) Gravity settling
View Answer
Explanation: Except for adsorption, all the working principles listed are used for the collection of particulates. These principles utilise properties like mass and density. Adsorption is the principle used for the recovery of gaseous effluents.
Sanfoundry Global Education & Learning Series – Air Pollution Control.
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