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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).

Difficulty: Easy

True
False
True only when assisted by a fan
False; this is induced draught

Correct Answer: True

Explanation:

Concept
Natural 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 Answer
True

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