ABC Study Guide 2026
Everything you need to pass the ABC exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📚 ABC Topics to Study (37)
✍️ Sample ABC Questions & Answers
1. In a water distribution system, the purpose of a pressure-reducing valve (PRV) is to:
PRVs maintain downstream pressure within safe limits, protecting pipes, meters, and fixtures from overpressure damage.
2. Which of the following best describes the concept of 'reciprocity' in ABC certifications?
Reciprocity allows operators certified in one state to obtain equivalent certification in another state based on their existing credentials.
3. Which of the following installation conditions would DISQUALIFY a pressure vacuum breaker?
A PVB must be installed at least 12 inches ABOVE the highest downstream outlet; installation below the highest outlet allows back-pressure to develop, defeating the device.
4. Which safety hazard is most associated with working in confined spaces at water and wastewater facilities?
Confined spaces at water/wastewater facilities often accumulate toxic gases like hydrogen sulfide or have oxygen-deficient atmospheres, posing life-threatening risks.
5. Which organization publishes the Approved Backflow Prevention Assemblies list that many US states reference for cross-connection control programs?
The USC Foundation for Cross-Connection Control (University of Southern California) publishes the widely recognized approved assemblies list used by most state programs.
6. In cross-connection control, what does the term 'degree of hazard' determine?
The degree of hazard at a cross-connection determines whether a low-hazard device (DCVA) or high-hazard device (RPZ or air gap) is required.