Natural draught definition: verify the correctness of the statement. Statement: A draught produced by a chimney due to the density difference between hot gases inside the chimney and the colder outside air is called natural draught. Choose the correct option (True/False).
Mechanical Engineering
Steam Boilers and Engines
Difficulty: Easy
Choose an option
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ATrue
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BFalse
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CTrue only when assisted by a fan
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DFalse; this is induced draught
Answer
Correct Answer: True
Explanation
ConceptNatural draught arises from the density difference between hot flue gases in the chimney and cooler ambient air. This buoyancy effect creates a pressure difference that draws combustion air through the furnace and expels gases through the stack—without fans.
Contrast
- Induced draught: fan draws gases out.
- Forced draught: fan pushes air in.
Final AnswerTrue