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An engine using octane air mixture has N2, O2, CO2, CO and H2O as constituents in the exhaust gas. Which one of the following can be conceded?
- a)Supply mixture is stoichiometric
- b)Supply mixture has incomplete combustion
- c)Supply mixture is rich
- d)Supply mixture is lean
Correct answer is option 'B'. Can you explain this answer?
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An engine using octane air mixture has N2, O2, CO2, CO and H2Oas const...
Increase of O2 and CO in flue gas analysis indicated incomplete combustion.
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An engine using octane air mixture has N2, O2, CO2, CO and H2Oas const...
Answer:
Introduction:
In an engine using octane air mixture, the exhaust gas consists of various constituents such as N2, O2, CO2, CO, and H2O. These constituents can provide information about the combustion process and the fuel-air mixture used in the engine.
Explanation:
To determine which option is correct, let's analyze each option one by one.
a) Supply mixture is stoichiometric:
A stoichiometric mixture refers to the ideal air-fuel ratio required for complete combustion. In this case, the fuel is octane, and the stoichiometric air-fuel ratio for octane is approximately 14.7:1 (mass basis). If the supply mixture is stoichiometric, it means that the amount of air supplied is precisely enough to completely burn the octane fuel. However, the given question states that the exhaust gas consists of CO and H2O, which indicates incomplete combustion. Therefore, option 'a' is not correct.
b) Supply mixture has incomplete combustion:
Incomplete combustion occurs when there is insufficient oxygen available to completely oxidize the fuel. In this case, the presence of CO and H2O in the exhaust gas suggests incomplete combustion. CO is formed when there is insufficient oxygen, and H2O is a byproduct of combustion. Therefore, option 'b' is correct.
c) Supply mixture is rich:
A rich mixture refers to an air-fuel ratio that contains more fuel than the stoichiometric ratio. In a rich mixture, the amount of fuel is excessive compared to the available oxygen. If the supply mixture is rich, it would lead to the formation of excess CO and unburned hydrocarbons in the exhaust gas. However, the question does not mention the presence of unburned hydrocarbons, which suggests that the supply mixture is not rich. Therefore, option 'c' is not correct.
d) Supply mixture is lean:
A lean mixture refers to an air-fuel ratio that contains more air than the stoichiometric ratio. In a lean mixture, the amount of air is excessive compared to the available fuel. If the supply mixture is lean, it would result in a higher concentration of O2 in the exhaust gas. However, the question states the presence of CO and H2O, which indicates incomplete combustion. Therefore, option 'd' is not correct.
Conclusion:
Based on the given information, the correct option is 'b' - the supply mixture has incomplete combustion. This is evident from the presence of CO and H2O in the exhaust gas.
Introduction:
In an engine using octane air mixture, the exhaust gas consists of various constituents such as N2, O2, CO2, CO, and H2O. These constituents can provide information about the combustion process and the fuel-air mixture used in the engine.
Explanation:
To determine which option is correct, let's analyze each option one by one.
a) Supply mixture is stoichiometric:
A stoichiometric mixture refers to the ideal air-fuel ratio required for complete combustion. In this case, the fuel is octane, and the stoichiometric air-fuel ratio for octane is approximately 14.7:1 (mass basis). If the supply mixture is stoichiometric, it means that the amount of air supplied is precisely enough to completely burn the octane fuel. However, the given question states that the exhaust gas consists of CO and H2O, which indicates incomplete combustion. Therefore, option 'a' is not correct.
b) Supply mixture has incomplete combustion:
Incomplete combustion occurs when there is insufficient oxygen available to completely oxidize the fuel. In this case, the presence of CO and H2O in the exhaust gas suggests incomplete combustion. CO is formed when there is insufficient oxygen, and H2O is a byproduct of combustion. Therefore, option 'b' is correct.
c) Supply mixture is rich:
A rich mixture refers to an air-fuel ratio that contains more fuel than the stoichiometric ratio. In a rich mixture, the amount of fuel is excessive compared to the available oxygen. If the supply mixture is rich, it would lead to the formation of excess CO and unburned hydrocarbons in the exhaust gas. However, the question does not mention the presence of unburned hydrocarbons, which suggests that the supply mixture is not rich. Therefore, option 'c' is not correct.
d) Supply mixture is lean:
A lean mixture refers to an air-fuel ratio that contains more air than the stoichiometric ratio. In a lean mixture, the amount of air is excessive compared to the available fuel. If the supply mixture is lean, it would result in a higher concentration of O2 in the exhaust gas. However, the question states the presence of CO and H2O, which indicates incomplete combustion. Therefore, option 'd' is not correct.
Conclusion:
Based on the given information, the correct option is 'b' - the supply mixture has incomplete combustion. This is evident from the presence of CO and H2O in the exhaust gas.
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An engine using octane air mixture has N2, O2, CO2, CO and H2Oas constituents in the exhaust gas. Which one of the following can be conceded?a)Supply mixture is stoichiometricb)Supply mixture has incomplete combustionc)Supply mixture is richd)Supply mixture is leanCorrect answer is option 'B'. Can you explain this answer?
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An engine using octane air mixture has N2, O2, CO2, CO and H2Oas constituents in the exhaust gas. Which one of the following can be conceded?a)Supply mixture is stoichiometricb)Supply mixture has incomplete combustionc)Supply mixture is richd)Supply mixture is leanCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about An engine using octane air mixture has N2, O2, CO2, CO and H2Oas constituents in the exhaust gas. Which one of the following can be conceded?a)Supply mixture is stoichiometricb)Supply mixture has incomplete combustionc)Supply mixture is richd)Supply mixture is leanCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An engine using octane air mixture has N2, O2, CO2, CO and H2Oas constituents in the exhaust gas. Which one of the following can be conceded?a)Supply mixture is stoichiometricb)Supply mixture has incomplete combustionc)Supply mixture is richd)Supply mixture is leanCorrect answer is option 'B'. Can you explain this answer?.
An engine using octane air mixture has N2, O2, CO2, CO and H2Oas constituents in the exhaust gas. Which one of the following can be conceded?a)Supply mixture is stoichiometricb)Supply mixture has incomplete combustionc)Supply mixture is richd)Supply mixture is leanCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about An engine using octane air mixture has N2, O2, CO2, CO and H2Oas constituents in the exhaust gas. Which one of the following can be conceded?a)Supply mixture is stoichiometricb)Supply mixture has incomplete combustionc)Supply mixture is richd)Supply mixture is leanCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An engine using octane air mixture has N2, O2, CO2, CO and H2Oas constituents in the exhaust gas. Which one of the following can be conceded?a)Supply mixture is stoichiometricb)Supply mixture has incomplete combustionc)Supply mixture is richd)Supply mixture is leanCorrect answer is option 'B'. Can you explain this answer?.
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