Backflow Prevention Practice Exam

What should be observed if a pressure vacuum breaker is functioning correctly during periods of flow?

1. No leaks from test cocks

2. Consistent water pressure

3. Clear air entry and exit

4. No noise during operation

The correct answer is: No leaks from test cocks

When a pressure vacuum breaker is functioning correctly during periods of flow, observing no leaks from the test cocks indicates proper sealing and functionality of the device. Test cocks are integral parts of the backflow prevention assembly that allow for testing and maintenance. If there are no leaks present, it confirms that the assembly is effectively preventing backflow and is maintaining a proper barrier against potential contaminants in the water supply. Clear air entry and exit, while important for the operation of a pressure vacuum breaker, is not an observable characteristic during periods of flow, as the air should not be entering when the system is under pressure. Similarly, consistent water pressure does not directly indicate that the vacuum breaker is functioning correctly; it may be affected by various factors unrelated to the backflow prevention device. Lastly, while noise might suggest problems with the device, a functioning pressure vacuum breaker could operate quietly or with some normal sounds, so a lack of noise is not a definitive indicator of correct operation. Observing no leaks is the most reliable indicator of correct functionality in this context.