Moderate
Secondary air is the air used to______________?
Correct answer: D. provide air round the burners for getting optimum combustion
- A. reduce the flame length
- B. increase the flame length
- C. transport and dry the coal
- D. provide air round the burners for getting optimum combustion
Explanation
Secondary air is admitted around the burner to provide sufficient oxygen and mixing for complete, well-controlled combustion. Primary air generally transports and dries pulverized coal, whereas secondary air controls the combustion zone.
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