Engine_2014 : Steam Plants - 139/1951
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| After a boiler has been taken off the line and is cooling, the air cock is opened to __________ . |
| A) purge all air from the steam drum |
| B) allow even cooling of the steam drum |
| C) guard against entrapped gas pockets in the superheater |
| D) prevent the formation of a vacuum within the boiler |
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