Turn down ratio of a burner____________________?
Correct answer: C. Is the ratio of maximum to minimum permissible heat input rates
- A. Should be as low as possible i.e., 1 : 2
- B. Should be 1:1 for a batch type furnace
- C. Is the ratio of maximum to minimum permissible heat input rates
- D. Is normally much more for a continuous furnace as compared to a batch furnace
Explanation
Burner turn-down ratio is defined as the maximum permissible heat-input rate divided by the minimum stable permissible heat-input rate. A larger ratio indicates that the burner can operate over a wider firing range.
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