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Which of the following symptoms shows that the combustion is necessarily complete?
- a)Presence of free carbon in exhaust
- b)Presence of CO in exhaust
- c)Presence of oxygen in exhaust
- d)Presence of nitrogen in exhaust
Correct answer is option 'C'. Can you explain this answer?
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Which of the following symptoms shows that the combustion is necessari...
Ans. (c)
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Which of the following symptoms shows that the combustion is necessari...
Understanding Complete Combustion
Complete combustion occurs when a fuel is burned in sufficient oxygen, resulting in the production of carbon dioxide (CO2) and water (H2O) without any unburned fuel or harmful byproducts.
Indicators of Complete Combustion
To determine whether combustion is complete, we can examine the presence of certain substances in the exhaust gases:
Conclusion
Among the options provided, the presence of oxygen in the exhaust (option C) is a clear indicator of incomplete combustion. In a complete combustion scenario, all available oxygen should have reacted with the fuel, leaving no residual oxygen in the exhaust. Thus, if oxygen is detected, it signals that the combustion process was not fully efficient. This understanding is crucial in mechanical engineering, especially in designing engines and combustion systems for higher efficiency and lower emissions.
Complete combustion occurs when a fuel is burned in sufficient oxygen, resulting in the production of carbon dioxide (CO2) and water (H2O) without any unburned fuel or harmful byproducts.
Indicators of Complete Combustion
To determine whether combustion is complete, we can examine the presence of certain substances in the exhaust gases:
- Presence of Free Carbon: Indicates incomplete combustion as it suggests unburned fuel. Often seen as soot.
- Presence of Carbon Monoxide (CO): A result of incomplete combustion, indicating that not enough oxygen was available for the fuel to burn completely.
- Presence of Oxygen: Suggests that there is excess oxygen in the combustion process. In a scenario of complete combustion, oxygen should ideally be fully consumed, leading to no leftover oxygen in the exhaust.
- Presence of Nitrogen: Commonly found in exhaust gases due to the air used in combustion. Its presence does not indicate completeness or incompleteness of combustion.
Conclusion
Among the options provided, the presence of oxygen in the exhaust (option C) is a clear indicator of incomplete combustion. In a complete combustion scenario, all available oxygen should have reacted with the fuel, leaving no residual oxygen in the exhaust. Thus, if oxygen is detected, it signals that the combustion process was not fully efficient. This understanding is crucial in mechanical engineering, especially in designing engines and combustion systems for higher efficiency and lower emissions.
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Which of the following symptoms shows that the combustion is necessarily complete?a)Presence of free carbon in exhaustb)Presence of CO in exhaustc)Presence of oxygen in exhaustd)Presence of nitrogen in exhaustCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Which of the following symptoms shows that the combustion is necessarily complete?a)Presence of free carbon in exhaustb)Presence of CO in exhaustc)Presence of oxygen in exhaustd)Presence of nitrogen in exhaustCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following symptoms shows that the combustion is necessarily complete?a)Presence of free carbon in exhaustb)Presence of CO in exhaustc)Presence of oxygen in exhaustd)Presence of nitrogen in exhaustCorrect answer is option 'C'. Can you explain this answer?.
Which of the following symptoms shows that the combustion is necessarily complete?a)Presence of free carbon in exhaustb)Presence of CO in exhaustc)Presence of oxygen in exhaustd)Presence of nitrogen in exhaustCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Which of the following symptoms shows that the combustion is necessarily complete?a)Presence of free carbon in exhaustb)Presence of CO in exhaustc)Presence of oxygen in exhaustd)Presence of nitrogen in exhaustCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following symptoms shows that the combustion is necessarily complete?a)Presence of free carbon in exhaustb)Presence of CO in exhaustc)Presence of oxygen in exhaustd)Presence of nitrogen in exhaustCorrect answer is option 'C'. Can you explain this answer?.
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