Mechanical Engineering Exam > Mechanical Engineering Questions > Consider the following statements:1. The gase...
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Consider the following statements:
1. The gases measured directly by Orsat apparatus from a flue gas sample are CO2, O2 and N2
2. Bomb calorimeter measures higher calorific value of fuel at constant pressure.
3. For burning 1 kg of fuel (carbon) to carbon monoxide, the stoichiometric quantity of air required is 8/3 kg
Which of the statements given above is/are correct?
- a)Only 1
- b)Only 2
- c)Only 3
- d)1, 2 and 3
Correct answer is option 'A'. Can you explain this answer?
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Consider the following statements:1. The gases measured directly by Or...
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Consider the following statements:1. The gases measured directly by Or...
Explanation:
Statement 1: The gases measured directly by the Orsat apparatus from a flue gas sample are CO2, O2, and N2.
The Orsat apparatus is a device used to analyze the composition of flue gases. It works on the principle of gas absorption. The flue gas sample is passed through a series of chemical solutions that selectively absorb specific gases. The gases measured directly by the Orsat apparatus are CO2, O2, and N2. Therefore, statement 1 is correct.
Statement 2: The bomb calorimeter measures the higher calorific value of fuel at constant pressure.
The bomb calorimeter is a device used to determine the calorific value of a fuel. It operates at constant volume, not constant pressure. The higher calorific value (also known as the gross calorific value) of a fuel is the amount of heat released when the fuel is completely burned and the products of combustion are cooled back to the initial temperature at constant volume. Therefore, statement 2 is incorrect.
Statement 3: For burning 1 kg of fuel (carbon) to carbon monoxide, the stoichiometric quantity of air required is 8/3 kg.
The stoichiometric quantity of air required for complete combustion of a fuel can be determined using the chemical equation for the combustion reaction. For the combustion of carbon to carbon monoxide, the balanced equation is:
C + O2 -> CO2
From the balanced equation, it can be seen that 1 mole of carbon requires 1 mole of oxygen to form 1 mole of carbon dioxide. The molecular weight of carbon is 12 g/mol, and the molecular weight of oxygen is 32 g/mol. Therefore, the stoichiometric ratio of carbon to oxygen is 12 g/mol : 32 g/mol, which simplifies to 3 g/mol : 8 g/mol.
For burning 1 kg (1000 g) of carbon to carbon monoxide, the stoichiometric quantity of air required can be calculated as follows:
(1000 g carbon) * (8 g oxygen / 3 g carbon) = 8000/3 g oxygen = 8/3 kg oxygen
Therefore, statement 3 is correct.
Conclusion:
From the above explanations, we can conclude that statement 1 and statement 3 are correct, while statement 2 is incorrect. Therefore, the correct answer is option 'A' - Only 1.
Statement 1: The gases measured directly by the Orsat apparatus from a flue gas sample are CO2, O2, and N2.
The Orsat apparatus is a device used to analyze the composition of flue gases. It works on the principle of gas absorption. The flue gas sample is passed through a series of chemical solutions that selectively absorb specific gases. The gases measured directly by the Orsat apparatus are CO2, O2, and N2. Therefore, statement 1 is correct.
Statement 2: The bomb calorimeter measures the higher calorific value of fuel at constant pressure.
The bomb calorimeter is a device used to determine the calorific value of a fuel. It operates at constant volume, not constant pressure. The higher calorific value (also known as the gross calorific value) of a fuel is the amount of heat released when the fuel is completely burned and the products of combustion are cooled back to the initial temperature at constant volume. Therefore, statement 2 is incorrect.
Statement 3: For burning 1 kg of fuel (carbon) to carbon monoxide, the stoichiometric quantity of air required is 8/3 kg.
The stoichiometric quantity of air required for complete combustion of a fuel can be determined using the chemical equation for the combustion reaction. For the combustion of carbon to carbon monoxide, the balanced equation is:
C + O2 -> CO2
From the balanced equation, it can be seen that 1 mole of carbon requires 1 mole of oxygen to form 1 mole of carbon dioxide. The molecular weight of carbon is 12 g/mol, and the molecular weight of oxygen is 32 g/mol. Therefore, the stoichiometric ratio of carbon to oxygen is 12 g/mol : 32 g/mol, which simplifies to 3 g/mol : 8 g/mol.
For burning 1 kg (1000 g) of carbon to carbon monoxide, the stoichiometric quantity of air required can be calculated as follows:
(1000 g carbon) * (8 g oxygen / 3 g carbon) = 8000/3 g oxygen = 8/3 kg oxygen
Therefore, statement 3 is correct.
Conclusion:
From the above explanations, we can conclude that statement 1 and statement 3 are correct, while statement 2 is incorrect. Therefore, the correct answer is option 'A' - Only 1.
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Consider the following statements:1. The gases measured directly by Orsat apparatus from a flue gas sample are CO2, O2 and N22. Bomb calorimeter measures higher calorific value of fuel at constant pressure.3. For burning 1 kg of fuel (carbon) to carbon monoxide, the stoichiometric quantity of air required is 8/3 kgWhich of the statements given above is/are correct?a)Only 1b)Only 2c)Only 3d)1, 2 and 3Correct answer is option 'A'. Can you explain this answer?
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