Engine_2014 : Steam Plants - 903/1951
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| The purpose of the refractory lining of a water-tube boiler furnace is to __________ . |
| A) prevent flames from impinging on tubes |
| B) assist in maintaining the heat of combustion within the furnace |
| C) support the outer casing |
| D) protect the superheater from convectional heat transfer |
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