Cross Connection Practice Exam

What happens if water continues to leak out of an open test cock during a test?

1. It indicates a faulty check valve

2. It signifies normal operation

3. It shows the assembly is correctly calibrated

4. It means the assembly is restricted

The correct answer is: It indicates a faulty check valve

When water leaks out of an open test cock during a test, it indicates a faulty check valve. The purpose of a check valve in a backflow prevention assembly is to prevent the reverse flow of water, ensuring that the potable water supply remains uncontaminated. If water is leaking from the test cock, it suggests that the check valve is not functioning properly and may be allowing water to flow back toward the source, which poses a potential risk of contamination. This scenario calls for immediate attention to address the faulty component and ensure that the backflow prevention assembly operates effectively to maintain water quality. The other options do not align with this situation. For instance, normal operation would not result in a leak; rather, water should remain secured within the system. Similarly, correct calibration does not involve any water loss from both test cocks or the check valves, and a restriction would not typically manifest as leaking water but rather as reduced flow or pressure changes. Thus, identifying a faulty check valve becomes crucial in maintaining the integrity of the water supply system.