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Which of the following statement is not true in the context of draught produced by chimney?
- a)Chimney needs no auxiliary power for its operation.
- b)Amount of draught produced increases with increase in outside air temperature.
- c)Lower the temperature of furnace gases, greater will be chimney draught.
- d)No flexibility in creating more draft to take peak loads.
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Which of the following statement is not true in the context of draught...
Explanation:
Outside Air Temperature and Chimney Draught:
The statement that "Amount of draught produced increases with increase in outside air temperature" is not true. In reality, the amount of chimney draught produced is inversely proportional to the outside air temperature. This means that as the outside air temperature increases, the chimney draught decreases.
Factors Affecting Chimney Draught:
1. Temperature of Furnace Gases: The lower the temperature of the furnace gases, the greater the chimney draught. This is because cooler gases are denser and hence lighter, resulting in a higher pressure difference between the inside and outside of the chimney.
2. Height of Chimney: A taller chimney will produce a greater draught due to the increased pressure difference between the top and bottom of the chimney.
3. Wind Conditions: Wind can either aid or hinder the chimney draught depending on its direction and speed. A wind blowing into the chimney can increase the draught, while a wind blowing away from the chimney can reduce it.
4. Chimney Diameter: A larger chimney diameter can result in a greater draught as it allows for more airflow.
Flexibility in Creating More Draught:
The statement that "No flexibility in creating more draft to take peak loads" is not entirely true. While some chimneys may have limitations in terms of increasing draught for peak loads, there are methods available to enhance chimney performance. For example, adding a mechanical draft inducer or adjusting the fuel input can help in creating more draught to accommodate peak loads.
In conclusion, understanding the factors that influence chimney draught is crucial in ensuring efficient operation and optimal performance.
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Community Answer
Which of the following statement is not true in the context of draught...
Explanation:
Outside Air Temperature and Draught:
- The statement that amount of draught produced increases with an increase in outside air temperature is not true.
- In reality, the amount of draught produced by a chimney is dependent on the temperature difference between the gases inside the chimney and the outside air.
- Higher outside air temperature reduces this temperature difference, resulting in lower chimney draught.
Other Statements:
- Chimney Operation: Chimneys do not require auxiliary power for their operation as they rely on the natural phenomenon of hot gases rising.
- Temperature of Furnace Gases: Lowering the temperature of furnace gases will increase the density of the gases, leading to greater chimney draught.
- Flexibility in Draft: Chimneys can be designed with features to increase draft during peak loads, such as using a taller chimney or installing a draft inducer.
In conclusion, the statement that the amount of draught produced increases with an increase in outside air temperature is not true. The key factor affecting chimney draught is the temperature difference between the gases inside the chimney and the outside air.
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Which of the following statement is not true in the context of draught produced by chimney?a)Chimney needs no auxiliary power for its operation.b)Amount of draught produced increases with increase in outside air temperature.c)Lower the temperature of furnace gases, greater will be chimney draught.d)No flexibility in creating more draft to take peak loads.Correct answer is option 'B'. Can you explain this answer?
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