Mechanical Engineering Exam > Mechanical Engineering Questions > Consider the following statements:1. Pulveris...
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Consider the following statements:
1. Pulverised fuel gives high and controlled burning rate
2. Insufficient air causes excessive smoking of exhaust
3. Excess air is provided to control the flue gas temperature
4. Effect of sulphur in fuel is to give high heat transfer rate.Which of these statements are correct?
- a)3 and 4
- b)2 and 3
- c)1 and 2
- d)1 and 4
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements:1. Pulverised fuel gives high and co...
Explanation:
Let's analyze each statement and determine whether it is correct or not.
Statement 1: Pulverized fuel gives high and controlled burning rate.
This statement is correct. Pulverized fuel refers to solid fuel that has been ground into a fine powder. When fuel is pulverized, it increases the surface area available for combustion, resulting in a higher burning rate. Additionally, the fine particles of pulverized fuel ensure better mixing with air, leading to a more controlled and efficient combustion process.
Statement 2: Insufficient air causes excessive smoking of exhaust.
This statement is correct. When there is insufficient air supplied for combustion, it leads to incomplete combustion of fuel. Incomplete combustion results in the formation of smoke, as the fuel does not burn completely and releases unburned carbon particles into the exhaust. These carbon particles are responsible for the excessive smoking of the exhaust.
Statement 3: Excess air is provided to control the flue gas temperature.
This statement is incorrect. Excess air is provided in combustion processes primarily to ensure complete combustion of the fuel. When excess air is supplied, it helps in burning all the available fuel, reducing the formation of harmful pollutants in the flue gas. However, controlling the flue gas temperature is not the primary purpose of supplying excess air. Flue gas temperature can be controlled through other means such as adjusting the fuel-air ratio or using heat recovery systems.
Statement 4: Effect of sulfur in fuel is to give a high heat transfer rate.
This statement is incorrect. The presence of sulfur in fuel does not directly affect the heat transfer rate. However, sulfur in fuel can lead to the formation of sulfur dioxide (SO2) during combustion, which is a pollutant and can contribute to environmental issues. It is important to control and reduce the sulfur content in fuel to minimize the emission of sulfur dioxide and its adverse effects.
Conclusion:
From the analysis above, we can conclude that statements 1 and 2 are correct, while statements 3 and 4 are incorrect. Therefore, the correct answer is option 'C' - 1 and 2.
Let's analyze each statement and determine whether it is correct or not.
Statement 1: Pulverized fuel gives high and controlled burning rate.
This statement is correct. Pulverized fuel refers to solid fuel that has been ground into a fine powder. When fuel is pulverized, it increases the surface area available for combustion, resulting in a higher burning rate. Additionally, the fine particles of pulverized fuel ensure better mixing with air, leading to a more controlled and efficient combustion process.
Statement 2: Insufficient air causes excessive smoking of exhaust.
This statement is correct. When there is insufficient air supplied for combustion, it leads to incomplete combustion of fuel. Incomplete combustion results in the formation of smoke, as the fuel does not burn completely and releases unburned carbon particles into the exhaust. These carbon particles are responsible for the excessive smoking of the exhaust.
Statement 3: Excess air is provided to control the flue gas temperature.
This statement is incorrect. Excess air is provided in combustion processes primarily to ensure complete combustion of the fuel. When excess air is supplied, it helps in burning all the available fuel, reducing the formation of harmful pollutants in the flue gas. However, controlling the flue gas temperature is not the primary purpose of supplying excess air. Flue gas temperature can be controlled through other means such as adjusting the fuel-air ratio or using heat recovery systems.
Statement 4: Effect of sulfur in fuel is to give a high heat transfer rate.
This statement is incorrect. The presence of sulfur in fuel does not directly affect the heat transfer rate. However, sulfur in fuel can lead to the formation of sulfur dioxide (SO2) during combustion, which is a pollutant and can contribute to environmental issues. It is important to control and reduce the sulfur content in fuel to minimize the emission of sulfur dioxide and its adverse effects.
Conclusion:
From the analysis above, we can conclude that statements 1 and 2 are correct, while statements 3 and 4 are incorrect. Therefore, the correct answer is option 'C' - 1 and 2.
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Consider the following statements:1. Pulverised fuel gives high and controlled burning rate2. Insufficient air causes excessive smoking of exhaust3. Excess air is provided to control the flue gas temperature4. Effect of sulphur in fuel is to give high heat transfer rate.Which of these statements are correct?a)3 and 4b)2 and 3c)1 and 2d)1 and 4Correct answer is option 'C'. Can you explain this answer?
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