Question 272Steam Plants - Assistant Engineer

The correct answer is A) The steam pressure will rise. When the sensing line for the idle boiler is accidentally opened, it creates an additional path for steam to escape from the operating boiler. This loss of back pressure on the operating boiler will cause the steam pressure to rise, as the boiler will continue to generate steam at the same rate but with less resistance to the steam flow. The other options are incorrect because: B) The water level will not drop, as the water level is controlled by the boiler's feed system, which is unaffected by the opened sensing line. C) The water level will not rise, for the same reason. D) The steam pressure will not drop, as the opened sensing line reduces the back pressure on the boiler, causing the pressure to increase.