ASSE 5130 Backflow Prevention Assembly
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Repairer Exam Practice Questions And Corre d d d d d
ct Answers (Verified Answers) Plus Rational
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es 2026 Q&A | Instant Download Pdf
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1. What is the main purpose of a backflow prevention assembly?
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A. To increase water pressure
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B. To prevent reverse flow of water into the potable supply
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C. To filter out impurities
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D. To regulate temperature
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Answer: B d
Rationale: Backflow prevention assemblies are designed to stop contamina
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ted or non-potable water from reversing into the clean water system.
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2. Which condition causes backpressure backflow?
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A. Negative pressure in the supplyd d d d
,B. A decrease in downstream pressure
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C. Pressure downstream exceeds supply pressure
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D. A vented condition in the supply line
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Answer: C d
Rationale: When downstream pressure becomes higher than supply pressu
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re, water can flow backward, causing backpressure backflow.
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3. The check valves in a Reduced Pressure Principle Assembly must close t
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ight when tested at:
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A. 0.5 psi d
B. 1.0 psi d
C. Differential pressure greater than 1.0 psi d d d d d
D. No differential pressure
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Answer: C d
Rationale: The check valves must maintain a differential pressure greater than
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1.0 psi to ensure proper sealing.
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4. Which component of a Double Check Valve Assembly (DCVA) prevents
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backflow?
A. Two independently acting check valves
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B. Air inlet valve
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C. Relief valve d
D. Shutoff valves only d d
,Answer: A d
Rationale: The two check valves act independently to prevent reverse flow, ens
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uring redundancy.
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5. The relief valve in an RP assembly opens when:
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A. There is a pressure drop across the first check
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B. The first check leaks and the pressure between checks exceeds supply
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C. The supply pressure increases suddenly
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D. Downstream pressure is higher than supply d d d d d
Answer: B d
Rationale: The relief valve opens when the pressure in the zone exceeds the
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supply pressure due to leakage past the first check.
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6. What is the minimum differential pressure required across each check
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valve in a DCVA during testing?
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A. 0.5 psi
d
B. 1.0 psi
d
C. 2.0 psi
d
D. 3.0 psi
d
Answer: B d
Rationale: Each check must close tight with a minimum of 1.0 psi differentia
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l pressure to pass.
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, 7. A repairer finds debris under the check valve disc. What is the most a
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ppropriate repair step?
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A. Replace the entire assembly
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B. Clean the check seat and disc
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C. Replace the disc with an oversized one
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D. Install a new test cock
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Answer: B d
Rationale: Debris on the seat prevents sealing; cleaning the seat and disc usual
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ly resolves the issue.
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8. What type of backflow results when the supply pressure drops below a
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tmospheric pressure? d
A. Backpressure
B. Backsiphonage
C. Cross-connection
D. Pressure surge d
Answer: B d
Rationale: Backsiphonage occurs when negative pressure draws water backwa
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rd into the potable system.
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d d d d
Repairer Exam Practice Questions And Corre d d d d d
ct Answers (Verified Answers) Plus Rational
d d d d d
es 2026 Q&A | Instant Download Pdf
d d d d d d
1. What is the main purpose of a backflow prevention assembly?
d d d d d d d d d d
A. To increase water pressure
d d d
B. To prevent reverse flow of water into the potable supply
d d d d d d d d d
C. To filter out impurities
d d d
D. To regulate temperature
d d
Answer: B d
Rationale: Backflow prevention assemblies are designed to stop contamina
d d d d d d d d
ted or non-potable water from reversing into the clean water system.
d d d d d d d d d d
2. Which condition causes backpressure backflow?
d d d d
A. Negative pressure in the supplyd d d d
,B. A decrease in downstream pressure
d d d d
C. Pressure downstream exceeds supply pressure
d d d d
D. A vented condition in the supply line
d d d d d d
Answer: C d
Rationale: When downstream pressure becomes higher than supply pressu
d d d d d d d d
re, water can flow backward, causing backpressure backflow.
d d d d d d d
3. The check valves in a Reduced Pressure Principle Assembly must close t
d d d d d d d d d d d
ight when tested at:
d d d
A. 0.5 psi d
B. 1.0 psi d
C. Differential pressure greater than 1.0 psi d d d d d
D. No differential pressure
d d
Answer: C d
Rationale: The check valves must maintain a differential pressure greater than
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1.0 psi to ensure proper sealing.
d d d d d
4. Which component of a Double Check Valve Assembly (DCVA) prevents
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backflow?
A. Two independently acting check valves
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B. Air inlet valve
d d
C. Relief valve d
D. Shutoff valves only d d
,Answer: A d
Rationale: The two check valves act independently to prevent reverse flow, ens
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uring redundancy.
d
5. The relief valve in an RP assembly opens when:
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A. There is a pressure drop across the first check
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B. The first check leaks and the pressure between checks exceeds supply
d d d d d d d d d d
C. The supply pressure increases suddenly
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D. Downstream pressure is higher than supply d d d d d
Answer: B d
Rationale: The relief valve opens when the pressure in the zone exceeds the
d d d d d d d d d d d d d
supply pressure due to leakage past the first check.
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6. What is the minimum differential pressure required across each check
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valve in a DCVA during testing?
d d d d d
A. 0.5 psi
d
B. 1.0 psi
d
C. 2.0 psi
d
D. 3.0 psi
d
Answer: B d
Rationale: Each check must close tight with a minimum of 1.0 psi differentia
d d d d d d d d d d d d
l pressure to pass.
d d d
, 7. A repairer finds debris under the check valve disc. What is the most a
d d d d d d d d d d d d d
ppropriate repair step?
d d
A. Replace the entire assembly
d d d
B. Clean the check seat and disc
d d d d d
C. Replace the disc with an oversized one
d d d d d d
D. Install a new test cock
d d d d
Answer: B d
Rationale: Debris on the seat prevents sealing; cleaning the seat and disc usual
d d d d d d d d d d d d
ly resolves the issue.
d d d
8. What type of backflow results when the supply pressure drops below a
d d d d d d d d d d d
tmospheric pressure? d
A. Backpressure
B. Backsiphonage
C. Cross-connection
D. Pressure surge d
Answer: B d
Rationale: Backsiphonage occurs when negative pressure draws water backwa
d d d d d d d d
rd into the potable system.
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