BACKFLOW PREVENTION ASSEMBLY
TESTER CERTIFICATION EXAM (ASSE
5110) 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. To increase water pressure
B. To prevent contamination of the potable water supply
C. To filter impurities from water
D. To heat water
Rationale: Backflow prevention assemblies protect potable water by
stopping contaminants from entering the water supply.
2. Backflow occurs when water flows in the __________ direction.
A. Forward
B. Controlled
C. Reverse
D. Oscillating
Rationale: Backflow refers to the reversal of normal flow direction,
potentially allowing contaminants to enter the supply.
3. Which condition can cause backflow?
A. Constant pressure
B. Clean water only
C. Pressure changes in piping system
D. Elevated water tank
, Rationale: Pressure fluctuations can create conditions for backflow to
occur.
4. What is the term for backflow caused by negative pressure?
A. Backpressure
B. Backsiphonage
C. Backflow prevention
D. Air gap
Rationale: Backsiphonage results from negative pressure drawing water
backward.
5. Backpressure backflow occurs due to:
A. Vacuum conditions
B. Higher downstream pressure than supply
C. Proper venting
D. Elevated tanks only
Rationale: Backpressure happens when downstream pressure exceeds
supply pressure, pushing water backward.
6. An air gap must be at least __________ times the diameter of the pipe.
A. 1×
B. 1.5×
C. 2×
D. 3×
Rationale: A minimum 2× pipe diameter air gap ensures adequate
separation to prevent backflow.
7. Which device is used for testable backflow prevention?
A. Check valve
B. Screen filter
C. Reduced Pressure Principal (RP) Assembly
D. Pressure regulator
Rationale: RP assemblies are designed for high hazard applications and
are testable.
8. A Double Check Valve Assembly is typically used for:
A. High hazard
B. Low to medium hazard
, C. Sewage systems
D. Air conditioning only
Rationale: Double check assemblies protect against low to medium
hazards.
9. The test cock on a backflow assembly is used to:
A. Drain the device
B. Connect test equipment
C. Vent air
D. Increase flow
Rationale: Test cocks allow connection of gauges for testing assembly
performance.
10.Backflow preventers must be tested at installation and then:
A. Never again
B. Monthly
C. Annually
D. Daily
Rationale: Annual testing ensures continued proper operation.
11.The ASSE standard for testers is:
A. 1001
B. 5000
C. 5110
D. 7000
Rationale: ASSE 5110 is the standard for backflow prevention assembly
testers.
12.Cross-connection control prevents:
A. Sound pollution
B. Contamination of potable water
C. Electrical surges
D. Structural damage
Rationale: Cross-connection control stops contaminants from non-potable
sources entering potable systems.
13.Which hazard represents the greatest risk to potable water?
A. Aesthetic nuisance
TESTER CERTIFICATION EXAM (ASSE
5110) 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. To increase water pressure
B. To prevent contamination of the potable water supply
C. To filter impurities from water
D. To heat water
Rationale: Backflow prevention assemblies protect potable water by
stopping contaminants from entering the water supply.
2. Backflow occurs when water flows in the __________ direction.
A. Forward
B. Controlled
C. Reverse
D. Oscillating
Rationale: Backflow refers to the reversal of normal flow direction,
potentially allowing contaminants to enter the supply.
3. Which condition can cause backflow?
A. Constant pressure
B. Clean water only
C. Pressure changes in piping system
D. Elevated water tank
, Rationale: Pressure fluctuations can create conditions for backflow to
occur.
4. What is the term for backflow caused by negative pressure?
A. Backpressure
B. Backsiphonage
C. Backflow prevention
D. Air gap
Rationale: Backsiphonage results from negative pressure drawing water
backward.
5. Backpressure backflow occurs due to:
A. Vacuum conditions
B. Higher downstream pressure than supply
C. Proper venting
D. Elevated tanks only
Rationale: Backpressure happens when downstream pressure exceeds
supply pressure, pushing water backward.
6. An air gap must be at least __________ times the diameter of the pipe.
A. 1×
B. 1.5×
C. 2×
D. 3×
Rationale: A minimum 2× pipe diameter air gap ensures adequate
separation to prevent backflow.
7. Which device is used for testable backflow prevention?
A. Check valve
B. Screen filter
C. Reduced Pressure Principal (RP) Assembly
D. Pressure regulator
Rationale: RP assemblies are designed for high hazard applications and
are testable.
8. A Double Check Valve Assembly is typically used for:
A. High hazard
B. Low to medium hazard
, C. Sewage systems
D. Air conditioning only
Rationale: Double check assemblies protect against low to medium
hazards.
9. The test cock on a backflow assembly is used to:
A. Drain the device
B. Connect test equipment
C. Vent air
D. Increase flow
Rationale: Test cocks allow connection of gauges for testing assembly
performance.
10.Backflow preventers must be tested at installation and then:
A. Never again
B. Monthly
C. Annually
D. Daily
Rationale: Annual testing ensures continued proper operation.
11.The ASSE standard for testers is:
A. 1001
B. 5000
C. 5110
D. 7000
Rationale: ASSE 5110 is the standard for backflow prevention assembly
testers.
12.Cross-connection control prevents:
A. Sound pollution
B. Contamination of potable water
C. Electrical surges
D. Structural damage
Rationale: Cross-connection control stops contaminants from non-potable
sources entering potable systems.
13.Which hazard represents the greatest risk to potable water?
A. Aesthetic nuisance
