BACKFLOW REPAIR TECHNICIAN
CERTIFICATION EXAM (ASSE 5130)
QUESTION 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. Reduce pipe corrosion
D. Improve water taste
Answer: B
Rationale: Backflow prevention assemblies are designed to stop
contaminated water from flowing backward into the potable water
supply.
2. Backflow can occur due to which two main conditions?
A. Leakage and evaporation
B. Backpressure and backsiphonage
C. Expansion and contraction
D. Corrosion and scaling
Answer: B
Rationale: Backpressure and backsiphonage are the two primary causes
of backflow.
3. Backsiphonage is most commonly caused by:
A. High system pressure
B. Sudden drop in supply pressure
C. Thermal expansion
D. Air trapped in pipes
, Answer: B
Rationale: A sudden drop in supply pressure can create a vacuum that
pulls contaminated water backward.
4. Which assembly is suitable for high hazard conditions?
A. Double Check Valve Assembly (DCVA)
B. Reduced Pressure Principle Assembly (RP)
C. Pressure Vacuum Breaker (PVB)
D. Atmospheric Vacuum Breaker (AVB)
Answer: B
Rationale: RP assemblies are designed to protect against high hazard
cross-connections.
5. A DCVA is typically installed for:
A. High health hazard conditions
B. Low hazard conditions
C. Chemical injection systems
D. Sewage systems
Answer: B
Rationale: DCVAs are approved for low hazard, non-health risk
applications.
6. Which component prevents reverse flow by closing under backpressure?
A. Shutoff valve
B. Check valve
C. Test cock
D. Relief valve
Answer: B
Rationale: Check valves close when flow reverses, preventing backflow.
7. The relief valve in an RP assembly discharges when:
A. Downstream pressure exceeds upstream pressure
B. Upstream pressure exceeds downstream pressure
C. Both check valves fail
D. System pressure is normal
Answer: A
, Rationale: The relief valve opens when downstream pressure rises above
upstream pressure, protecting the supply.
8. What is the minimum clearance required below an RP relief valve?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: C
Rationale: Standard installation requires at least 18 inches of clearance
for proper drainage and inspection.
9. Which tool is commonly used to test backflow assemblies?
A. Pressure gauge
B. Multimeter
C. Backflow test kit
D. Flow meter
Answer: C
Rationale: A calibrated backflow test kit is used to test differential
pressures and valve operation.
10.Before repairing a backflow assembly, the technician should first:
A. Replace all check valves
B. Notify the water authority
C. Shut off the water supply
D. Remove the assembly
Answer: C
Rationale: Shutting off the water supply ensures safety and prevents
flooding.
11.What is the function of test cocks?
A. Release air from pipes
B. Allow pressure testing
C. Drain the assembly
D. Regulate flow
Answer: B
CERTIFICATION EXAM (ASSE 5130)
QUESTION 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. Reduce pipe corrosion
D. Improve water taste
Answer: B
Rationale: Backflow prevention assemblies are designed to stop
contaminated water from flowing backward into the potable water
supply.
2. Backflow can occur due to which two main conditions?
A. Leakage and evaporation
B. Backpressure and backsiphonage
C. Expansion and contraction
D. Corrosion and scaling
Answer: B
Rationale: Backpressure and backsiphonage are the two primary causes
of backflow.
3. Backsiphonage is most commonly caused by:
A. High system pressure
B. Sudden drop in supply pressure
C. Thermal expansion
D. Air trapped in pipes
, Answer: B
Rationale: A sudden drop in supply pressure can create a vacuum that
pulls contaminated water backward.
4. Which assembly is suitable for high hazard conditions?
A. Double Check Valve Assembly (DCVA)
B. Reduced Pressure Principle Assembly (RP)
C. Pressure Vacuum Breaker (PVB)
D. Atmospheric Vacuum Breaker (AVB)
Answer: B
Rationale: RP assemblies are designed to protect against high hazard
cross-connections.
5. A DCVA is typically installed for:
A. High health hazard conditions
B. Low hazard conditions
C. Chemical injection systems
D. Sewage systems
Answer: B
Rationale: DCVAs are approved for low hazard, non-health risk
applications.
6. Which component prevents reverse flow by closing under backpressure?
A. Shutoff valve
B. Check valve
C. Test cock
D. Relief valve
Answer: B
Rationale: Check valves close when flow reverses, preventing backflow.
7. The relief valve in an RP assembly discharges when:
A. Downstream pressure exceeds upstream pressure
B. Upstream pressure exceeds downstream pressure
C. Both check valves fail
D. System pressure is normal
Answer: A
, Rationale: The relief valve opens when downstream pressure rises above
upstream pressure, protecting the supply.
8. What is the minimum clearance required below an RP relief valve?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: C
Rationale: Standard installation requires at least 18 inches of clearance
for proper drainage and inspection.
9. Which tool is commonly used to test backflow assemblies?
A. Pressure gauge
B. Multimeter
C. Backflow test kit
D. Flow meter
Answer: C
Rationale: A calibrated backflow test kit is used to test differential
pressures and valve operation.
10.Before repairing a backflow assembly, the technician should first:
A. Replace all check valves
B. Notify the water authority
C. Shut off the water supply
D. Remove the assembly
Answer: C
Rationale: Shutting off the water supply ensures safety and prevents
flooding.
11.What is the function of test cocks?
A. Release air from pipes
B. Allow pressure testing
C. Drain the assembly
D. Regulate flow
Answer: B
