Engine : Steam Plants - 509/811
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| The pressuretrol which is installed on an auxiliary boiler senses steam pressure changes and __________. |
| A) controls the flow of feed water to the boiler |
| B) monitors the boiler high water level |
| C) secures the fires when a fusible plug burns out |
| D) automatically regulates the quantity of oil and air flow to the burner |
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