Backflow Prevention Assembly Tester
Certification Examination Questions With
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. A backflow prevention assembly is primarily designed to:
A. Increase water pressure in a distribution system
B. Prevent contamination of potable water due to reverse flow
C. Filter sediments from drinking water
D. Measure system flow rate
Correct Answer: B
Rationale: Backflow prevention assemblies are engineered
specifically to protect potable water supplies from
contamination or pollution by stopping water from flowing in the
reverse direction, which could carry hazardous substances into
the clean water system.
2. Which device provides the highest level of backflow protection?
A. Double Check Valve Assembly (DCVA)
, B. Pressure Vacuum Breaker (PVB)
C. Reduced Pressure Principle Assembly (RP)
D. Atmospheric Vacuum Breaker (AVB)
Correct Answer: C
Rationale: A Reduced Pressure Principle Assembly offers the
highest protection because it includes a relief valve that
discharges water when differential pressure drops, preventing
backpressure and backsiphonage contamination.
3. Backflow caused by a drop in supply pressure is known as:
A. Backpressure
B. Backsiphonage
C. Hydraulic surge
D. Cross-connection
Correct Answer: B
Rationale: Backsiphonage occurs when negative pressure in the
supply line creates a vacuum effect, pulling contaminated water
into the potable system.
4. Backflow caused by higher pressure on the customer side is called:
A. Backsiphonage
, B. Backpressure
C. Cavitation
D. Air gap failure
Correct Answer: B
Rationale: Backpressure occurs when downstream pressure
exceeds supply pressure, forcing potentially contaminated water
back into the potable system.
5. The purpose of a relief valve in an RP assembly is to:
A. Increase flow rate
B. Maintain constant pressure
C. Discharge water when differential pressure is low
D. Filter debris
Correct Answer: C
Rationale: The relief valve opens when the pressure differential
is insufficient, discharging water to ensure contaminants cannot
enter the potable supply.
6. Which component is found in a Double Check Valve Assembly?
A. Relief valve
B. Two independently acting check valves
, C. Air inlet valve
D. Pressure gauge only
Correct Answer: B
Rationale: A DCVA contains two check valves in series to provide
protection against backflow under low to moderate hazard
conditions.
7. An air gap is defined as:
A. A mechanical valve system
B. A physical separation between water outlet and flood level
C. A pressure zone regulator
D. A pipe connection seal
Correct Answer: B
Rationale: An air gap is the unobstructed vertical space between
a water outlet and the flood level rim of a receiving vessel,
providing the highest level of backflow protection.
8. Which condition is most likely to cause backsiphonage?
A. Pump failure upstream
B. Increased downstream demand
C. High supply pressure
Certification Examination Questions With
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. A backflow prevention assembly is primarily designed to:
A. Increase water pressure in a distribution system
B. Prevent contamination of potable water due to reverse flow
C. Filter sediments from drinking water
D. Measure system flow rate
Correct Answer: B
Rationale: Backflow prevention assemblies are engineered
specifically to protect potable water supplies from
contamination or pollution by stopping water from flowing in the
reverse direction, which could carry hazardous substances into
the clean water system.
2. Which device provides the highest level of backflow protection?
A. Double Check Valve Assembly (DCVA)
, B. Pressure Vacuum Breaker (PVB)
C. Reduced Pressure Principle Assembly (RP)
D. Atmospheric Vacuum Breaker (AVB)
Correct Answer: C
Rationale: A Reduced Pressure Principle Assembly offers the
highest protection because it includes a relief valve that
discharges water when differential pressure drops, preventing
backpressure and backsiphonage contamination.
3. Backflow caused by a drop in supply pressure is known as:
A. Backpressure
B. Backsiphonage
C. Hydraulic surge
D. Cross-connection
Correct Answer: B
Rationale: Backsiphonage occurs when negative pressure in the
supply line creates a vacuum effect, pulling contaminated water
into the potable system.
4. Backflow caused by higher pressure on the customer side is called:
A. Backsiphonage
, B. Backpressure
C. Cavitation
D. Air gap failure
Correct Answer: B
Rationale: Backpressure occurs when downstream pressure
exceeds supply pressure, forcing potentially contaminated water
back into the potable system.
5. The purpose of a relief valve in an RP assembly is to:
A. Increase flow rate
B. Maintain constant pressure
C. Discharge water when differential pressure is low
D. Filter debris
Correct Answer: C
Rationale: The relief valve opens when the pressure differential
is insufficient, discharging water to ensure contaminants cannot
enter the potable supply.
6. Which component is found in a Double Check Valve Assembly?
A. Relief valve
B. Two independently acting check valves
, C. Air inlet valve
D. Pressure gauge only
Correct Answer: B
Rationale: A DCVA contains two check valves in series to provide
protection against backflow under low to moderate hazard
conditions.
7. An air gap is defined as:
A. A mechanical valve system
B. A physical separation between water outlet and flood level
C. A pressure zone regulator
D. A pipe connection seal
Correct Answer: B
Rationale: An air gap is the unobstructed vertical space between
a water outlet and the flood level rim of a receiving vessel,
providing the highest level of backflow protection.
8. Which condition is most likely to cause backsiphonage?
A. Pump failure upstream
B. Increased downstream demand
C. High supply pressure
