Discussion
Which of the following type of draught is produced by the chimney in thermal power plant?
Answer: C
The chimney produces a natural draught. The hot gases in the chimney are lighter than the cool outside air, so the difference in the weight of the two columns makes the gases rise through the chimney and draws air through the furnace, without a fan.
Induced and forced draught are made by fans, and a balanced draught uses both. So the third option is correct.
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