Backflow Prevention Practice Exam

The purpose of a vacuum breaker is to _____.

1. Increase water flow

2. Maintain water pressure

3. Prevent backflow

4. Reduce pipe noise

The correct answer is: Prevent backflow

A vacuum breaker is specifically designed to prevent backflow in plumbing systems; this is why it is the correct answer. Backflow can occur when there is a drop in water pressure that causes unwanted water to flow backward into the clean water supply. A vacuum breaker does this by allowing air to enter the system when a negative pressure (vacuum) is detected. This air acts as a barrier, preventing the contaminated water from coming back into the potable water system, thereby protecting the water supply from contamination. In contrast to the other options, a vacuum breaker does not increase water flow, nor does it maintain water pressure. Its function is not related to reducing pipe noise either; it's solely focused on safeguarding the water supply from potential contamination through backflow prevention. Therefore, its role is critical in ensuring safe and clean drinking water, which underscores the importance of incorporating vacuum breakers in appropriate plumbing systems.