Backflow Prevention Assembly Tester Certification
Exam (ASSE 5110) Questions and Correct Answers
Verified Answers) Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a backflow prevention assembly?
A. Increase water pressure
B. Prevent contamination of potable water
C. Filter debris
D. Improve water taste
Answer: B
Rationale: Backflow prevention assemblies are designed to protect
potable water systems from contamination due to backflow.
2. Backflow is best defined as:
A. Water flowing uphill
B. Reversal of normal water flow
C. High water pressure
D. Water filtration process
,Answer: B
Rationale: Backflow occurs when water reverses direction, potentially
allowing contaminants into the potable supply.
3. What are the two types of backflow?
A. Static and dynamic
B. Laminar and turbulent
C. Backpressure and backsiphonage
D. Direct and indirect
Answer: C
Rationale: Backpressure and backsiphonage are the two mechanisms
that cause backflow.
4. Backsiphonage is caused by:
A. Increased downstream pressure
B. Negative pressure in supply line
C. Elevated temperature
D. Pipe corrosion
Answer: B
,Rationale: Backsiphonage occurs when supply pressure drops below
atmospheric pressure.
5. Backpressure occurs when:
A. Supply pressure exceeds downstream pressure
B. Downstream pressure exceeds supply pressure
C. Pressure is equal
D. No water flow exists
Answer: B
Rationale: Backpressure forces contaminated water back into the
potable system.
6. Which assembly protects against both backpressure and
backsiphonage?
A. AVB
B. PVB
C. RPZ
D. Vacuum breaker
Answer: C
, Rationale: Reduced Pressure Zone (RPZ) assemblies protect against both
conditions.
7. What does RPZ stand for?
A. Reduced Pressure Zone
B. Reverse Pressure Zone
C. Regulated Pressure Zone
D. Residual Pressure Zone
Answer: A
Rationale: RPZ is the standard abbreviation for Reduced Pressure Zone.
8. A Double Check Valve Assembly (DCVA) is used for:
A. High hazard applications
B. Low hazard applications
C. Chemical systems
D. Sewage systems
Answer: B
Rationale: DCVAs are approved only for low hazard (non-health hazard)
conditions.
Exam (ASSE 5110) Questions and Correct Answers
Verified Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a backflow prevention assembly?
A. Increase water pressure
B. Prevent contamination of potable water
C. Filter debris
D. Improve water taste
Answer: B
Rationale: Backflow prevention assemblies are designed to protect
potable water systems from contamination due to backflow.
2. Backflow is best defined as:
A. Water flowing uphill
B. Reversal of normal water flow
C. High water pressure
D. Water filtration process
,Answer: B
Rationale: Backflow occurs when water reverses direction, potentially
allowing contaminants into the potable supply.
3. What are the two types of backflow?
A. Static and dynamic
B. Laminar and turbulent
C. Backpressure and backsiphonage
D. Direct and indirect
Answer: C
Rationale: Backpressure and backsiphonage are the two mechanisms
that cause backflow.
4. Backsiphonage is caused by:
A. Increased downstream pressure
B. Negative pressure in supply line
C. Elevated temperature
D. Pipe corrosion
Answer: B
,Rationale: Backsiphonage occurs when supply pressure drops below
atmospheric pressure.
5. Backpressure occurs when:
A. Supply pressure exceeds downstream pressure
B. Downstream pressure exceeds supply pressure
C. Pressure is equal
D. No water flow exists
Answer: B
Rationale: Backpressure forces contaminated water back into the
potable system.
6. Which assembly protects against both backpressure and
backsiphonage?
A. AVB
B. PVB
C. RPZ
D. Vacuum breaker
Answer: C
, Rationale: Reduced Pressure Zone (RPZ) assemblies protect against both
conditions.
7. What does RPZ stand for?
A. Reduced Pressure Zone
B. Reverse Pressure Zone
C. Regulated Pressure Zone
D. Residual Pressure Zone
Answer: A
Rationale: RPZ is the standard abbreviation for Reduced Pressure Zone.
8. A Double Check Valve Assembly (DCVA) is used for:
A. High hazard applications
B. Low hazard applications
C. Chemical systems
D. Sewage systems
Answer: B
Rationale: DCVAs are approved only for low hazard (non-health hazard)
conditions.
