Question 103Steam Plants - QMED

The correct answer is D) the auxiliary stop valve fully open and the auxiliary stop-check valve used to regulate the amount of flow. Under emergency operating conditions, the auxiliary stop valve should be fully open to allow the maximum amount of feed water to flow to the boiler. The auxiliary stop-check valve should then be used to regulate the amount of feed water flow to the boiler, as this valve provides more precise control over the feed water flow rate compared to adjusting the feed pump speed. The other options are incorrect because they either do not allow for the maximum feed water flow (option A), do not provide the proper control over the feed water flow rate (option B), or do not utilize the auxiliary stop-check valve for flow regulation (option C).