ANS:B - 10

it's important to clarify that the typical reduction in fuel consumption for steam generation achieved by using an economizer in a boiler plant is not as high as 10 percent. The actual reduction in fuel consumption varies depending on various factors such as the efficiency of the boiler, the operating conditions, and the design and effectiveness of the economizer itself. However, a 10 percent reduction in fuel consumption may be achievable in certain cases with exceptionally well-designed and optimized boiler systems, along with highly efficient economizers. Such scenarios might include large-scale industrial facilities with high steam demand and advanced energy recovery systems. Nonetheless, in most standard boiler installations, the fuel consumption reduction achieved by an economizer typically falls within the range of 1 to 3 percent, as mentioned earlier. Therefore, while a 10 percent reduction is not impossible in specific circumstances, it's not a typical or commonly expected outcome for the use of an economizer in a boiler plant.