BACKFLOW PREVENTION PRACTICE
EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
CORRECT RATED A+ UPDATED
2025/2026
1. Where should backflow protection be installed to prevent contamination
from the public water supply?
A. Appliance or fixture
B. Building foundation
C. Irrigation system
D. Service Connection
E. Sprinkler riser
Answer: D. Service Connection
2. When do backflow preventer manufacturers recommend that assemblies be
tested?
A. Installed
B. Moved
C. Repaired or Installed
D. Shut down
E. Water suppliers provide notice
Answer: C. Repaired or Installed
3. How is a differential pressure gauge reading of 0.2 psid represented on a
water column sight tube?
A. 1/16 in. (0.16 cm)
B. 1/2 in. (1.3 cm)
C. 2 in. (5.1 cm)
D. 3.5 in. (8.9 cm)
E. 5.5 in. (14 cm)
Answer: E. 5.5 in. (14 cm)
,4. What does pollution in a public water supply indicate about the water?
A. Aesthetically bad
B. Biological with virus only
C. Lowering the pH below 1.4
D. Radiological
E. Toxic
Answer: A. Aesthetically bad
5. When does backsiphonage occur in copper tubing?
A. Greater than atmospheric pressure
B. Greater than barometric pressure
C. Greater than 0 gauge pressure
D. Less than absolute pressure
E. Less than atmospheric pressure
Answer: E. Less than atmospheric pressure
6. What can a cross-connection be?
A. Backflow preventer
B. Church symbol
C. OSHA hazardous area designation
D. Railroad and highway intersection sign
E. Temporary hose bibb connection
Answer: E. Temporary hose bibb connection
The isolation of a plumbing water system hazard requires____?
A. Appliance protection
B. Building quarantine
C. High-hazard protection
D. Meter protection
E. Toxin monitoring -ANSWER✔✔Appliance protection
,A direct cross-connection suggests the piping system may be subjected to ____?
A. Backpressure or backsiphonage
B. Backsiphonage only
C. Periodic inspection
D. Sustained pressure
E. Toxic materials -ANSWER✔✔Backpressure or backsiphonage
A pipe restriction's flow velocity increase may allow ____?
A. Aspiration
B. Backpressure
C. Low turbulence
D. Pressure head
E. Pressure surges -ANSWER✔✔Aspiration
Water supply contamination from backflow may result in ____?
A. A bad taste
B. Coloration
C. Death
D. Odor or smell
E. Pipe wall mineral deposit flaking -ANSWER✔✔Death
To prevent backflow, an atmospheric vacuum breaker is primarily designed to
____?
A. Allow air into the outlet piping system
B. Create an elevation loop above ground
, C. Introduce head loss
D. Prevent backpressure
E. Restrict velocity -ANSWER✔✔Allow air into the outlet piping system
Atmospheric vacuum breakers will typically be located on ____?
A. Commercial irrigation systems
B. Fire-suppression systems
C. Plumbing fixtures or appliances
D. Utility storage tanks
E. Water service connections -ANSWER✔✔Plumbing fixtures or appliances
The mechanical component of an atmospheric vacuum breaker serves as an air-
inlet valve and a ____?
A. Check valve
B. Regulating valve
C. Relief valve
D. Shut-off valve
E. Test port -ANSWER✔✔Check valve
A deck-mounted atmospheric vacuum breaker's critical installation level is above
the outlet usage by ___?
A. 1 in. (2.5 cm)
B. 3 in. (7.6 cm)
C. 6 in. (15 cm)
D. 12 in. (30 cm)
E. 18 in. (46 cm) -ANSWER✔✔1 in. (2.5 cm)
EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
CORRECT RATED A+ UPDATED
2025/2026
1. Where should backflow protection be installed to prevent contamination
from the public water supply?
A. Appliance or fixture
B. Building foundation
C. Irrigation system
D. Service Connection
E. Sprinkler riser
Answer: D. Service Connection
2. When do backflow preventer manufacturers recommend that assemblies be
tested?
A. Installed
B. Moved
C. Repaired or Installed
D. Shut down
E. Water suppliers provide notice
Answer: C. Repaired or Installed
3. How is a differential pressure gauge reading of 0.2 psid represented on a
water column sight tube?
A. 1/16 in. (0.16 cm)
B. 1/2 in. (1.3 cm)
C. 2 in. (5.1 cm)
D. 3.5 in. (8.9 cm)
E. 5.5 in. (14 cm)
Answer: E. 5.5 in. (14 cm)
,4. What does pollution in a public water supply indicate about the water?
A. Aesthetically bad
B. Biological with virus only
C. Lowering the pH below 1.4
D. Radiological
E. Toxic
Answer: A. Aesthetically bad
5. When does backsiphonage occur in copper tubing?
A. Greater than atmospheric pressure
B. Greater than barometric pressure
C. Greater than 0 gauge pressure
D. Less than absolute pressure
E. Less than atmospheric pressure
Answer: E. Less than atmospheric pressure
6. What can a cross-connection be?
A. Backflow preventer
B. Church symbol
C. OSHA hazardous area designation
D. Railroad and highway intersection sign
E. Temporary hose bibb connection
Answer: E. Temporary hose bibb connection
The isolation of a plumbing water system hazard requires____?
A. Appliance protection
B. Building quarantine
C. High-hazard protection
D. Meter protection
E. Toxin monitoring -ANSWER✔✔Appliance protection
,A direct cross-connection suggests the piping system may be subjected to ____?
A. Backpressure or backsiphonage
B. Backsiphonage only
C. Periodic inspection
D. Sustained pressure
E. Toxic materials -ANSWER✔✔Backpressure or backsiphonage
A pipe restriction's flow velocity increase may allow ____?
A. Aspiration
B. Backpressure
C. Low turbulence
D. Pressure head
E. Pressure surges -ANSWER✔✔Aspiration
Water supply contamination from backflow may result in ____?
A. A bad taste
B. Coloration
C. Death
D. Odor or smell
E. Pipe wall mineral deposit flaking -ANSWER✔✔Death
To prevent backflow, an atmospheric vacuum breaker is primarily designed to
____?
A. Allow air into the outlet piping system
B. Create an elevation loop above ground
, C. Introduce head loss
D. Prevent backpressure
E. Restrict velocity -ANSWER✔✔Allow air into the outlet piping system
Atmospheric vacuum breakers will typically be located on ____?
A. Commercial irrigation systems
B. Fire-suppression systems
C. Plumbing fixtures or appliances
D. Utility storage tanks
E. Water service connections -ANSWER✔✔Plumbing fixtures or appliances
The mechanical component of an atmospheric vacuum breaker serves as an air-
inlet valve and a ____?
A. Check valve
B. Regulating valve
C. Relief valve
D. Shut-off valve
E. Test port -ANSWER✔✔Check valve
A deck-mounted atmospheric vacuum breaker's critical installation level is above
the outlet usage by ___?
A. 1 in. (2.5 cm)
B. 3 in. (7.6 cm)
C. 6 in. (15 cm)
D. 12 in. (30 cm)
E. 18 in. (46 cm) -ANSWER✔✔1 in. (2.5 cm)
