This set of Air Pollution Control Multiple Choice Questions & Answers (MCQs) focuses on “Gaseous Pollutants – Control of Carbon Monoxide”.
1. What is carbon monoxide?
a) Intermediate formed during combustion
b) Final product formed during combustion
c) Pollutant from mobile sources only
d) Pollutant from stationary sources only
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Explanation: Carbon monoxide is formed as an intermediate product of combustion, i.e. reaction between fossil fuels and oxygen. Its formation occurs in both stationary and mobile sources of pollution. There are several reasons for its production.
2. What is the reason for the formation of carbon monoxide in rich mixtures?
a) Excess oxygen
b) Insufficient oxygen
c) Bad turbulence
d) Low temperatures
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Explanation: In rich mixtures of fossil fuels, carbon monoxide is formed because of the insufficient carbon monoxide supply. There is too much fuel and too little oxygen for complete combustion to occur, which results in carbon monoxide formation.
3. What is the reason for the formation of carbon monoxide when the fuel mixture is lean?
a) Excess oxygen
b) Insufficient oxygen
c) Bad turbulence
d) Low temperatures
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Explanation: In lean fuel mixtures, there is sufficient oxygen for the combustion to occur. The issue here is inadequate turbulence, which prevents the adequate mixing of the fuel and oxygen. Additionally, the decomposition of carbon dioxide into carbon monoxide may occur at high temperatures.
4. Which of the following is not a reason for the formation of carbon dioxide during combustion?
a) Fuel to air ratio
b) Degree of turbulence
c) Temperature
d) Chamber pressure
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Explanation: Chamber pressure does not affect the formation of carbon monoxide. The temperature of the reaction may result in the decomposition of formed carbon dioxide into carbon monoxide. Low turbulence is a problem for low fuel to air ratios.
5. The best method for dealing with carbon dioxide emissions is by removal from flue gases.
a) True
b) False
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Explanation: Carbon monoxide removal is not done through the treatment of flue gases. Instead, the stages where it is produced should be managed properly to control its formation. However, suppression during formation poses its own set of problems.
6. Why is it difficult to control the formation of carbon monoxide during combustion?
a) Conflict with nitrogen oxides control methods
b) Prediction of formation is not accurate
c) It is difficult to capture
d) Increases costs of the combustion unit
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Explanation: Carbon monoxide is difficult to remove from flue gases. Therefore, emission control should be done during its formation. However, control methods are difficult to implement because they clash with the nitrogen oxide control methods.
7. Which of the following is not a proper control method of carbon monoxide?
a) Treatment of flue gases
b) Operation and maintenance of the unit
c) Proper design of the unit
d) Proper installation of the unit
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Explanation: Treatment of flue gases to reduce carbon monoxide emissions is not a viable option. This limitation leaves the only control method to be its formation. Therefore, proper design of the combustion unit and its care are the appropriate control methods.
8. Why are CO emissions from the chemical and petroleum industries so low?
a) Proper treatment of flue gases
b) The emissions are high
c) Recovery is high
d) Careful operation
View Answer
Explanation: Treatment and recovery of carbon monoxide are not chosen for carbon monoxide emissions. Instead, the reason for low emissions is the careful operation of the combustion unit and dependence on efficient design codes.
Sanfoundry Global Education & Learning Series – Air Pollution Control.
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