Answer & Solution
Answer: Option A
Solution:
The draught produced by a chimney depends on various factors such as its height, cross-sectional area, and the temperature difference between the gases inside the chimney and the outside air.
For the same height, a steel chimney typically has a larger cross-sectional area compared to a brick chimney due to the thinner walls of steel chimneys.
According to Bernoulli's principle, the pressure difference between the inside and outside of the chimney is inversely proportional to the cross-sectional area. Hence, a larger cross-sectional area results in less pressure difference and therefore less draught.
Therefore, the draught produced by a steel chimney is
less compared to that produced by a brick chimney for the same height.
