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| Q. |
In case of oil fired boiler, the excess air is usually |
| A. | 1 to 2 percent |
| B. | 5 to 12 percent |
| C. | 20 to 25 percent |
| D. | 75 to 125 percent |
| E. | None of the above |
| Answer» B. 5 to 12 percent | |
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