Question 92Steam Plants - Assistant Engineer
70% to passWhile raising steam on a cold boiler, the air cock is to be closed after _______________.
Athe economizer drain is closed
Bsteam has formed and all air is vented
Cthe boiler is cut in on the line
Dall burners have been lit and firing normally
AI Explanation
The correct answer is B) steam has formed and all air is vented. When raising steam on a cold boiler, the air cock should be closed after steam has formed and all air has been vented from the boiler. This ensures that the boiler is completely filled with steam and no air pockets remain, which could impede the steam generation process. The other options are incorrect because: A) closing the economizer drain is not related to closing the air cock; C) cutting the boiler in on the line does not necessarily mean the air has been properly vented; and D) lighting the burners does not automatically mean the air has been vented from the boiler.
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