This set of Air Pollution Control Multiple Choice Questions & Answers (MCQs) focuses on “Source Correction Methods”.
1. What is meant by the process change method of source correction?
a) Technique modification
b) Raw material replacement
c) Equipment change
d) Choose a different equipment
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Explanation: Modifying techniques or opting for newer methods and processes that yield little to no pollution is called the process change. Changing and modifying processes drastically reduces emissions, which is beneficial.
2. How are volatile gases recovered from the emissions using the process change method?
a) They are condensed
b) They are absorbed
c) They are burned
d) They are adsorbed
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Explanation: Volatile gases recovery is accomplished by condensing the gases. If non-condensable gases are present, they are subjected to recycling once they are recovered. An example of such a gas is hydrogen sulphide.
3. How can process change help reduce dust emission from rotary kilns?
a) Enhance raw materials
b) Clean gases
c) Change operating conditions
d) Change kiln
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Explanation: Changing operating conditions can reduce dust emissions. Conditions like gas velocity reduction and feed location modification are examples of operating conditions that can be adjusted.
4. How can process change help reduce sulphurous emissions from paper industry?
a) Absorb sulphurous gases
b) Avoid the kraft process
c) Avoid usage of sulphides
d) Change operating conditions
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Explanation: Avoiding the use of sulphides is a viable method of process change. When sulphides are avoided in the paper-making process, the production of sulphur-containing gases also reduces. This alternative is feasible.
5. How can sulphurous emissions be reduced from the steel industry?
a) Process change
b) Equipment changes
c) Raw material change
d) Emission treatment
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Explanation: Process change is used to reduce emissions of sulphur-containing gases from the steel industry. Here, the sulphur-containing fuel, along with air, and limestone is added to a hot iron bath. The CO formed is used for combustion, while the sulphur is retained in the bath.
6. How can fly ash emissions be reduced from thermal plants?
a) Raw material change
b) Process changes
c) Equipment change
d) Emission treatment
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Explanation: Process change is used to reduce fly ash emissions. In this process, the coal is washed first and then crushed into small pellets. This process prevents the excessive production of fly ash during processing.
7. How can sulphurous compounds be reduced in the smelting industry?
a) Raw material change
b) Equipment changes
c) Process change
d) Emission treatment
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Explanation: With the help of the process change method, sulphurous gas emissions can be curbed. The ores are separated in this process by way of metallurgical separations; this ensures ease of handling and lower emissions.
8. How are carbon monoxide and hydrocarbons reductions be reduced from automobiles?
a) Raw material change
b) Treatment of emissions
c) Process change
d) Equipment modification
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Explanation: To reduce the emissions of carbon monoxide and hydrocarbons, equipment modification may be adopted. The gases are combusted to produce more energy by modifying the inner workings of the internal combustion engine.
9. How can hydrocarbon vapour leaks be avoided in the petroleum industries?
a) Equipment modification
b) Treatment of emissions
c) Process change
d) Changing raw material
View Answer
Explanation: Hydrocarbons stores in tanks may leak due to various reasons like temperature fluctuations and displacement. Prevention is ensured by modifying the silos to be pressurised or having floating roof covers.
10. Which equipment can the open-hearth furnace can be replaced with for reduction of emissions in the steel industry?
a) Smelting furnace
b) Oxygen furnace
c) Electric arc furnace
d) Blast furnace
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Explanation: Oxygen furnace is a viable alternative to the open-hearth furnace in the steel industry. The open-hearth furnace releases the emissions directly into the atmosphere, unlike the oxygen furnace. Unwanted gases, which are produced, can be recovered efficiently.
11. Other than source correction methods, which industrial operations can reduce air pollutant emissions?
a) Equipment maintenance
b) Equipment replacement
c) Process change
d) Emission treatment
View Answer
Explanation: Equipment replacement and process change are methods of source correction. Emission treatment is an alternative to source correction methods. Normal industrial operations, like routine equipment maintenance, can help reduce emissions.
12. Checking seals and gaskets can help reduce emissions.
a) True
b) False
View Answer
Explanation: Many chemical plants can reduce emissions by routinely checking valves and seals in the facility. Routine inspection can avoid leaks around ducts and in the piping. This practice is essential for plants dealing with hazardous materials.
Sanfoundry Global Education & Learning Series – Air Pollution Control.
To practice all areas of Air Pollution Control, here is complete set of 1000+ Multiple Choice Questions and Answers.
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