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An insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of the vessel experience
[1993]
- a)Increase in temperature, pressure and energy
- b)Decrease in temperature, pressure and energy
- c)Increase in temperature and pressure but no change in energy
- d)Increase in temperature and pressure but decrease in energy
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
An insulated rigid vessel contains a mixture of fuel and air. The mixt...
Increase in temperature and pressure but no change in energy
Temperature increases
Volume = constant; p – decreases
Δ Q = 0 (insulated)
Temperature increases
Volume = constant; p – decreases
Δ Q = 0 (insulated)
Most Upvoted Answer
An insulated rigid vessel contains a mixture of fuel and air. The mixt...
The correct answer is option 'C': Increase in temperature and pressure but no change in energy.
Explanation:
When the mixture of fuel and air in the insulated rigid vessel is ignited by a minute spark, a combustion reaction takes place. During this reaction, the fuel reacts with the oxygen in the air to produce carbon dioxide, water vapor, and release energy in the form of heat.
1. Increase in temperature:
During the combustion process, a significant amount of heat is released. This heat raises the temperature of the mixture inside the vessel. The increase in temperature is a result of the exothermic nature of the combustion reaction.
2. Increase in pressure:
As the fuel and air mixture undergoes combustion, the reactants are converted into gaseous products (carbon dioxide and water vapor). The conversion of reactants into products leads to an increase in the total number of gas molecules. According to the ideal gas law (PV = nRT), an increase in the number of gas molecules at constant volume will result in an increase in pressure.
3. No change in energy:
The combustion reaction releases energy in the form of heat, which increases the temperature and pressure of the mixture. However, since the vessel is insulated and considered rigid, there is no exchange of energy with the surroundings. Therefore, the total energy of the system remains constant.
Conclusion:
When the fuel and air mixture is ignited in the insulated rigid vessel, the temperature and pressure increase due to the exothermic nature of the combustion reaction and the increase in the number of gas molecules. However, there is no change in the total energy of the system since the vessel is insulated and no energy is exchanged with the surroundings. Thus, the correct answer is option 'C': Increase in temperature and pressure but no change in energy.
Explanation:
When the mixture of fuel and air in the insulated rigid vessel is ignited by a minute spark, a combustion reaction takes place. During this reaction, the fuel reacts with the oxygen in the air to produce carbon dioxide, water vapor, and release energy in the form of heat.
1. Increase in temperature:
During the combustion process, a significant amount of heat is released. This heat raises the temperature of the mixture inside the vessel. The increase in temperature is a result of the exothermic nature of the combustion reaction.
2. Increase in pressure:
As the fuel and air mixture undergoes combustion, the reactants are converted into gaseous products (carbon dioxide and water vapor). The conversion of reactants into products leads to an increase in the total number of gas molecules. According to the ideal gas law (PV = nRT), an increase in the number of gas molecules at constant volume will result in an increase in pressure.
3. No change in energy:
The combustion reaction releases energy in the form of heat, which increases the temperature and pressure of the mixture. However, since the vessel is insulated and considered rigid, there is no exchange of energy with the surroundings. Therefore, the total energy of the system remains constant.
Conclusion:
When the fuel and air mixture is ignited in the insulated rigid vessel, the temperature and pressure increase due to the exothermic nature of the combustion reaction and the increase in the number of gas molecules. However, there is no change in the total energy of the system since the vessel is insulated and no energy is exchanged with the surroundings. Thus, the correct answer is option 'C': Increase in temperature and pressure but no change in energy.
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Community Answer
An insulated rigid vessel contains a mixture of fuel and air. The mixt...
Increase in temperature and pressure but no change in energy
Temperature increases
Volume = constant; p – decreases
Δ Q = 0 (insulated)
Temperature increases
Volume = constant; p – decreases
Δ Q = 0 (insulated)
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An insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of the vessel experience[1993]a)Increase in temperature, pressure and energyb)Decrease in temperature, pressure and energyc)Increase in temperature and pressure but no change in energyd)Increase in temperature and pressure but decrease in energyCorrect answer is option 'C'. Can you explain this answer?
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An insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of the vessel experience[1993]a)Increase in temperature, pressure and energyb)Decrease in temperature, pressure and energyc)Increase in temperature and pressure but no change in energyd)Increase in temperature and pressure but decrease in energyCorrect answer is option 'C'. 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 insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of the vessel experience[1993]a)Increase in temperature, pressure and energyb)Decrease in temperature, pressure and energyc)Increase in temperature and pressure but no change in energyd)Increase in temperature and pressure but decrease in energyCorrect answer is option 'C'. 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 insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of the vessel experience[1993]a)Increase in temperature, pressure and energyb)Decrease in temperature, pressure and energyc)Increase in temperature and pressure but no change in energyd)Increase in temperature and pressure but decrease in energyCorrect answer is option 'C'. Can you explain this answer?.
An insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of the vessel experience[1993]a)Increase in temperature, pressure and energyb)Decrease in temperature, pressure and energyc)Increase in temperature and pressure but no change in energyd)Increase in temperature and pressure but decrease in energyCorrect answer is option 'C'. 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 insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of the vessel experience[1993]a)Increase in temperature, pressure and energyb)Decrease in temperature, pressure and energyc)Increase in temperature and pressure but no change in energyd)Increase in temperature and pressure but decrease in energyCorrect answer is option 'C'. 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 insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of the vessel experience[1993]a)Increase in temperature, pressure and energyb)Decrease in temperature, pressure and energyc)Increase in temperature and pressure but no change in energyd)Increase in temperature and pressure but decrease in energyCorrect answer is option 'C'. Can you explain this answer?.
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An insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of the vessel experience[1993]a)Increase in temperature, pressure and energyb)Decrease in temperature, pressure and energyc)Increase in temperature and pressure but no change in energyd)Increase in temperature and pressure but decrease in energyCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for An insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of the vessel experience[1993]a)Increase in temperature, pressure and energyb)Decrease in temperature, pressure and energyc)Increase in temperature and pressure but no change in energyd)Increase in temperature and pressure but decrease in energyCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of An insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of the vessel experience[1993]a)Increase in temperature, pressure and energyb)Decrease in temperature, pressure and energyc)Increase in temperature and pressure but no change in energyd)Increase in temperature and pressure but decrease in energyCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
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