Plumbing systems in mobile homes are factory-installed by the manufacturer. In manufactured housing, the plumbing is designed, routed, and tested at the factory as part of the home’s construction, meeting federal standards and ensuring proper connections, venting, and leak testing before shipment. This ensures reliability and a correct integration with the home’s framing and layout. After delivery, on-site work is usually limited to hookups and any needed service, not the initial installation itself.

NFPA 99 uses risk categories to classify equipment by how a failure would affect patient care. The scale goes from higher risk to lower risk, with Category 1 handling the highest risk and Category 4 the lowest. If a failure would have no effect on patient care, it belongs to the lowest-risk group. This helps determine how often something needs testing, maintenance, or redundancy. So when there’s no impact on patient care from a failure, the appropriate category is Category 4. The other categories cover scenarios where failures could affect patient safety or care, requiring more stringent monitoring and maintenance.

In accounting, what a business owns (assets) must be matched by the claims against those assets. Those claims come from creditors (liabilities) and, in a complete picture, the owner’s investment (equity). Here, the idea being tested is that the resources on hand are financed by obligations to others, which is shown by assets equaling liabilities in this simplified representation. The other options mix up the relationships: revenues are income, not a funding source; equity is a form of claim but isn’t the sole or direct equality with assets; and reversing the sides would misstate who owns or owes what. In a full balance sheet, you’d still have assets = liabilities + equity, but among these choices, equalizing assets with liabilities communicates the balancing concept.

Oil and grease float on top, so the device that actually gathers that surface film is a skimming wheel. It sits at the top of the interceptor and makes contact with the floating layer, pushing the grease into a collection area or bucket while the cleaner water beneath continues to flow out. The other parts do different jobs: a baffle slows and directs flow to aid separation, a dip tube draws water from below the grease layer to the outlet to minimize carryover, and the outlet valve controls discharge. So the skimming wheel is the element that actively collects the surface grease.