The draught produced by steel chimney as compared to that produced by brick chimney for the same height is_____________?
Correct answer: B. more
- A. less
- B. more
- C. same
- D. may be more or less
Explanation
For equal height, a steel chimney generally produces more draught because it heats up quickly and maintains hotter gases, while its smooth surface also reduces friction. Hotter gases have lower density and create a greater stack effect.
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