Question 415Steam Plants - Assistant Engineer

The correct answer is D) the stop valve fully open and the auxiliary check valve used to regulate the amount of flow. The reasoning behind this is that the proper valve positions for controlling feed water to the boiler using the auxiliary feed system should have the stop valve fully open to allow maximum flow, while the auxiliary check valve is used to regulate the amount of feed water flow into the boiler. This ensures a consistent and controlled supply of feed water to the boiler, which is crucial for the safe and efficient operation of a steam vessel. The other options are incorrect because they do not properly describe the correct valve positions for the auxiliary feed system. Option A would result in an unregulated feed water flow, option B would not allow for proper control of the feed water, and option C would not provide the necessary open stop valve for maximum flow.