Backflow Prevention Assembly Tester — Practice Exam
PVB: practice questions
Our Backflow Tester bank has 7 questions on this topic. Here are 4 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
Why must the test kit be held at the same level as the PVB during the air inlet test?
- It keeps the hoses clean and speeds up the test
- Height differences change the gauge reading
- It speeds the test
- It keeps hoses clean
Show the answer
B. Height differences change the gauge reading — Elevation adds or subtracts head.
Question 2
Does a PVB protect against backpressure?
- Yes, for low hazards
- Yes, for high hazards
- No; only against backsiphonage
- Yes, for high-hazard applications
Show the answer
C. No; only against backsiphonage — Don't use where backpressure can occur.
Question 3
What are the main parts of a pressure vacuum breaker (PVB)?
- Two check valves and a relief valve
- A single shutoff valve
- A float and an air inlet only
- A spring-loaded check valve, a spring-loaded air inlet, two shutoff valves and two test cocks
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D. A spring-loaded check valve, a spring-loaded air inlet, two shutoff valves and two test cocks — PVBs can be under continuous pressure.
Question 4
In a PVB field test, what must the check valve hold?
- At least 0.2 psid
- At least 5.0 psid in the direction of flow
- At least 1.0 psid in the direction of flow
- At least 2.0 psid
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C. At least 1.0 psid in the direction of flow — USC-style requirement.