This set of Air Pollution Control Multiple Choice Questions & Answers (MCQs) focuses on “Air Pollution Control Methods and Equipment”.
1. Which method is the most effective way to deal with air pollution problems?
a) Prevent formation of pollutants
b) Clean the gases
c) Release them into the atmosphere
d) Change the process
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Explanation: The most effective way of dealing with the air pollutant problem is to prevent their formation. Another method is to minimise the pollutant emissions at the source. When neither of these can be implemented, then emission treatment is viable.
2. At the industrial level, how can engineers deal with pollutant problems in the plant conception stage?
a) Treat the gases efficiently
b) Choose equipment and processes that produce the least pollutants
c) Release no pollutants
d) Produce no pollutants
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Explanation: Producing no pollutants is ideal, but this may not be viable. Engineers can conceptualise and compare various equipment and processes and choose the ones which emit the least amount of pollutants.
3. What is the name of the method of choosing processes that produce little to no pollution?
a) Emission control
b) Control methods
c) Source correction methods
d) Cleaning effluents
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Explanation: Engineers have the option of studying and comparing various approaches and processes at the design stage. At this stage, the process which releases little to no pollutants is chosen, to prevent releasing pollutants in bulk. This method is known as source correction.
4. Which of the following is not a source correction method?
a) Raw material changes
b) Process changes
c) Equipment modification
d) Emission treatment
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Explanation: All of the given options, except for emission treatment, are source control methods. These methods are used ideally for new plants. Effective operation and proper maintenance of equipment have to be opted for existing plants.
5. What should be done if source correction methods do not achieve pollution control goals?
a) Effluent cleaning
b) Choose better equipment
c) Close the plant
d) Run the plant despite issues
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Explanation: When source correction methods are not a viable option, effluent treatment is chosen. There are various operations available for the treatment for different types of air pollutants; based on the nature of pollutants, the efficiency of removal, etc.,.
6. Which source correction method is chosen when a particular raw material is responsible for causing pollution?
a) Process change
b) Raw material changes
c) Equipment changes
d) Emission treatment
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Explanation: When a particular raw material is causing significant pollution problems, an alternative to it can be chosen. The alternative raw material should be chosen in such a way that they reduce the formation of undesired pollutants and impurities.
7. Using low sulphur fuels in place of high sulphur fuels is which kind of source correction method?
a) Process change
b) Equipment changes
c) Raw material change
d) Emission treatment
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Explanation: In the given example, one raw material (high sulphur fuel) is replaced with another raw material (low sulphur fuel). Choosing a fuel which contains less sulphur produces fewer pollutants like sulphur dioxide. A drawback of using low sulphur fuels is their availability.
8. Which of the following processes is the best method of using coal as a fuel in a way which produces minimum air pollution?
a) Breakdown coal chunks
b) Pre-treatment of coal to remove sulphur
c) Low sulphur fuels
d) Coal gasification
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Explanation: Among the given options, coal gasification is the most viable way. The pollutants produced from this method can be removed easily. Low sulphur-containing fuels are a good option, but they have limited availability.
9. Why is coal gasification more viable that pre-treating coal to remove sulphur?
a) It is easy to remove sulphur from effluents
b) Pre-treatment is costly
c) The efficiency is higher
d) Resource efficient
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Explanation: Coal gasification is viable because unwanted materials can be removed easily from the effluent stream, as opposed to eliminating materials from solid coal. After the gasification of coal, the sulphurous gases can be removed easily by absorption.
10. How is sulphur removed from the flue gas after coal gasification?
a) Adsorption
b) Absorption
c) Washing
d) Reverse osmosis
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Explanation: Absorption is easy and feasible for the removal of sulphur from the coal gasification process. The coal once gasified into coke, can be used as a fuel. Coke combustion produces little pollution because the pollutants have already been removed during coal gasification.
11. How is the emission of dust minimised in the steel industry?
a) Raw material change
b) Equipment changes
c) Process change
d) Emission treatment
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Explanation: Changing raw material from the raw ore to sintered ore pellets is a viable option. Large chunks of raw ore contain lots of unwanted materials like dirt, which get mobilised as dust. Using pelleted ores can reduce the production of dust.
12. How is dust emission reduced in the ore handling stage?
a) Process change
b) Equipment changes
c) Raw material change
d) Emission treatment
View Answer
Explanation: Ore handling releases significant amounts of dust because of the nature of the ore itself. Ores contain dirt and gravel, which become airborne during the handling process. Instead, the ore can be broken down into smaller sizes to avoid this.
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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