Engine_2014 : Steam Plants - 1166/1951
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| Which of the following is the best reason for opening the air cock when draining a water-tube boiler? |
| A) With the air cock open, the boiler drains without producing a vacuum. |
| B) Water flows out of the boiler too rapidly with the air cock closed. |
| C) Air mixed with the water will create a cleansing effect in the tubes. |
| D) Air coming into the boiler will help dry out the boiler's surface. |
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