Which of the following is considered unacceptable during the leakage test?

During a leakage test, the integrity of the system being tested is crucial for ensuring safety and operational efficiency. When we consider what is deemed unacceptable during this test, leaking past clappers with resilient seats stands out. Clappers with resilient seats are designed to prevent backflow and ensure that water only moves in the intended direction. If there is leakage past these clappers, it indicates a malfunction or failure in the sealing mechanism, which can lead to contamination or inefficiencies in the water delivery system.

In contrast, slight weeping at metal-to-metal seats may be permissible under some conditions, as it can be a minor issue that does not compromise the overall functionality significantly. No leakage at all is generally the ideal scenario, but it doesn't reflect on the operation failure. Similarly, minor losses in pressure might occur due to normal operational variances and are typically acceptable as long as they fall within an operational threshold.

Thus, the presence of leakage where resilient seats are used signifies a serious concern that must be addressed to maintain the integrity of the water well system.