Engine : Steam Plants - 180/811
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| Carbon deposits on the diffuser and register throat ring of a burner __________. |
| A) are of no consequence and may be left in place until a fireside inspection allows time for removal |
| B) allow heat loss to the boiler casing |
| C) interfere with air flow around the burner |
| D) cause pre-ignition of the atomized fuel |
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