National Fire Protection Association (NFPA) 1081 Standard for Facility Fire Brigade Member Professional Qualifications Practice Test

A wye appliance is designed to split a single supply line into two or more lines, allowing water to flow from one source and provide multiple outlets. This is often used when a single water supply needs to be delivered to different locations or for different purposes at the same time. Therefore, it functions by dividing the flow of water from a single source.

In contrast, a Siamese appliance is used to combine two or more water supply sources into one line to maximize flow into a single delivery point. It is employed when multiple hoses are needed to provide a greater flow of water to a singular operation, such as in firefighting.

The statement that a wye appliance functions inversely to a Siamese appliance is accurate because the wye appliance splits flow from a single source while the Siamese appliance combines flows from multiple sources. This distinction highlights their opposing functions in hydraulic systems, making the statement true.