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 transferrate.
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 transferrate.
Which of the statements are WRONG?
- a)3 and 4
- b)2 and 3
- c)1 and 2
- d)1 and 4
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Consider the following statements:1. Pulverised fuel gives high and co...
(i) Excess air is provided for completing the combustion.
(ii) Effect of sulphur is corrosion.
(ii) Effect of sulphur is corrosion.
Most Upvoted Answer
Consider the following statements:1. Pulverised fuel gives high and co...
Incorrect Statements:
3. Excess air is provided to control the flue gas temperature.
4. Effect of sulphur in fuel is to give high heat transfer rate.
Explanation:
1. Pulverized fuel gives high and controlled burning rate:
Pulverized fuel is composed of coal that is ground into powder form. This powder form of fuel burns more efficiently as it has a larger surface area, which results in a higher burning rate. Therefore, statement 1 is correct.
2. Insufficient air causes excessive smoking of exhaust:
For complete combustion of fuel, a sufficient amount of air is required. If the air supply is insufficient, then the combustion process becomes incomplete, resulting in the production of smoke in the exhaust. Therefore, statement 2 is correct.
3. Excess air is provided to control the flue gas temperature:
Excess air is provided to ensure complete combustion and to reduce the emission of pollutants. However, it does not control the flue gas temperature. Therefore, statement 3 is incorrect.
4. Effect of sulphur in fuel is to give high heat transfer rate:
Sulphur in fuel creates problems during combustion, such as the formation of sulphur dioxide (SO2). It also leads to the formation of sulfuric acid, which causes corrosion of heat transfer surfaces. Therefore, statement 4 is incorrect.
Conclusion:
Hence, the incorrect statements are 3 and 4.
3. Excess air is provided to control the flue gas temperature.
4. Effect of sulphur in fuel is to give high heat transfer rate.
Explanation:
1. Pulverized fuel gives high and controlled burning rate:
Pulverized fuel is composed of coal that is ground into powder form. This powder form of fuel burns more efficiently as it has a larger surface area, which results in a higher burning rate. Therefore, statement 1 is correct.
2. Insufficient air causes excessive smoking of exhaust:
For complete combustion of fuel, a sufficient amount of air is required. If the air supply is insufficient, then the combustion process becomes incomplete, resulting in the production of smoke in the exhaust. Therefore, statement 2 is correct.
3. Excess air is provided to control the flue gas temperature:
Excess air is provided to ensure complete combustion and to reduce the emission of pollutants. However, it does not control the flue gas temperature. Therefore, statement 3 is incorrect.
4. Effect of sulphur in fuel is to give high heat transfer rate:
Sulphur in fuel creates problems during combustion, such as the formation of sulphur dioxide (SO2). It also leads to the formation of sulfuric acid, which causes corrosion of heat transfer surfaces. Therefore, statement 4 is incorrect.
Conclusion:
Hence, the incorrect statements are 3 and 4.
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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 transferrate.Which of the statements are WRONG?a)3 and 4b)2 and 3c)1 and 2d)1 and 4Correct answer is option 'A'. Can you explain this answer?
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