The draught produced by chimney of given height at given outside temperature___________?
Correct answer: B. increases if the chimney gas temperature increases
- A. decreases if the chimney gas temperature increases
- B. increases if the chimney gas temperature increases
- C. remains same irrespective of chimney gas temperature
- D. may increase or decrease
Explanation
Chimney draught increases when the chimney gases become hotter because their density falls, increasing the pressure difference between the hot gas column and outside air. Thus, hotter gases produce stronger natural circulation.
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