Repairer Exam Practice Questions And

ASSE 5130 Backflow Prevention Assembly Repairer Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the main purpose of a backflow prevention assembly?
• To increase water pressure
• To prevent reverse flow of water into the potable supply
• To filter out impurities
• To regulate temperature

Answer: B

Rationale: Backflow prevention assemblies are designed to stop

contaminated or non-potable water from reversing into the clean water system.

• Which condition causes backpressure backflow?
• Negative pressure in the supply 1 / 4

• A decrease in downstream pressure
• Pressure downstream exceeds supply pressure
• A vented condition in the supply line

Answer: C

Rationale: When downstream pressure becomes higher than supply

pressure, water can flow backward, causing backpressure backflow.

• The check valves in a Reduced Pressure Principle Assembly must close

tight when tested at:

• 0.5 psi
• 1.0 psi
• Differential pressure greater than 1.0 psi
• No differential pressure

Answer: C

Rationale: The check valves must maintain a differential pressure greater

than 1.0 psi to ensure proper sealing.

• Which component of a Double Check Valve Assembly (DCVA) prevents

backflow?

• Two independently acting check valves
• Air inlet valve
• Relief valve
• Shutoff valves only 2 / 4

Answer: A

Rationale: The two check valves act independently to prevent reverse flow,

ensuring redundancy.

5. The relief valve in an RP assembly opens when:

• There is a pressure drop across the first check
• The first check leaks and the pressure between checks exceeds supply
• The supply pressure increases suddenly
• Downstream pressure is higher than supply

Answer: B

Rationale: The relief valve opens when the pressure in the zone exceeds

the supply pressure due to leakage past the first check.

• What is the minimum differential pressure required across each check

valve in a DCVA during testing?

• 0.5 psi
• 1.0 psi
• 2.0 psi
• 3.0 psi

Answer: B

Rationale: Each check must close tight with a minimum of 1.0 psi

differential pressure to pass. 3 / 4

• A repairer finds debris under the check valve disc. What is the most

appropriate repair step?

• Replace the entire assembly
• Clean the check seat and disc
• Replace the disc with an oversized one
• Install a new test cock

Answer: B

Rationale: Debris on the seat prevents sealing; cleaning the seat and disc

usually resolves the issue.

• What type of backflow results when the supply pressure drops below

atmospheric pressure?

• Backpressure
• Backsiphonage
• Cross-connection
• Pressure surge

Answer: B

Rationale: Backsiphonage occurs when negative pressure draws water

backward into the potable system.

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