Backflow Prevention Practice Exam 2026
NEWEST QUESTIONS AND CORRECT
ANSWERS | A+ GRADE VERIFIED ANSWERS
Containing a plumbing system from the public water supply requires backflow
protection at the _______?
A. Appliance or fixture
B. Building foundation
C. Irrigation system
D. Service Connection
E. Sprinkler riser - ✔✔ANSWER✔✔-Service Connection
Backflow preventer manufacturers recommend that assemblies be field-tested
annually and when_____?
A. Installed
B. Moved
C. Repaired or Installed
D. Shut down
E. Water suppliers provide notice - ✔✔ANSWER✔✔-Repaired or Installed
A differential pressure gauge reading of 0.2 psid is represented on water
column sight tube by _____?
,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✔✔-5.5 in. (14 cm)
Pollution of a public water supply suggests the substance in the water is ____?
A. Aesthetically bad
B. Biological with virus only
C. Lowering the pH below 1.4
D. Radiological
E. Toxic - ✔✔ANSWER✔✔-Aesthetically bad
Backsiphonage may occur when the pressure inside copper tubing is ____?
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✔✔-Less than atmospheric
pressure
A cross-connection may be a permanent piping arrangement or a(n) ____?
A. Backflow preventer
B. Church symbol
C. OSHA hazardous area designation
D. Railroad and highway intersection sign
,E. Temporary hose bibb connection - ✔✔ANSWER✔✔-Temporary hose bibb
connection
Double check valve assembly product performance standards require venting
for _____?
A. Chemicals
B. Test cock corrosion
C. Trapped air
D. Vertical installations
E. Winterization - ✔✔ANSWER✔✔-Trapped air
A low-hazard use only backflow preventer is a(n) _____?
A. Air-gap separation
B. Atmospheric vacuum breaker
C. Double check valve assembly
D. Pressure vacuum breaker assembly
E. Reduced pressure principle assembly - ✔✔ANSWER✔✔-Double check valve
assembly
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
NEWEST QUESTIONS AND CORRECT
ANSWERS | A+ GRADE VERIFIED ANSWERS
Containing a plumbing system from the public water supply requires backflow
protection at the _______?
A. Appliance or fixture
B. Building foundation
C. Irrigation system
D. Service Connection
E. Sprinkler riser - ✔✔ANSWER✔✔-Service Connection
Backflow preventer manufacturers recommend that assemblies be field-tested
annually and when_____?
A. Installed
B. Moved
C. Repaired or Installed
D. Shut down
E. Water suppliers provide notice - ✔✔ANSWER✔✔-Repaired or Installed
A differential pressure gauge reading of 0.2 psid is represented on water
column sight tube by _____?
,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✔✔-5.5 in. (14 cm)
Pollution of a public water supply suggests the substance in the water is ____?
A. Aesthetically bad
B. Biological with virus only
C. Lowering the pH below 1.4
D. Radiological
E. Toxic - ✔✔ANSWER✔✔-Aesthetically bad
Backsiphonage may occur when the pressure inside copper tubing is ____?
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✔✔-Less than atmospheric
pressure
A cross-connection may be a permanent piping arrangement or a(n) ____?
A. Backflow preventer
B. Church symbol
C. OSHA hazardous area designation
D. Railroad and highway intersection sign
,E. Temporary hose bibb connection - ✔✔ANSWER✔✔-Temporary hose bibb
connection
Double check valve assembly product performance standards require venting
for _____?
A. Chemicals
B. Test cock corrosion
C. Trapped air
D. Vertical installations
E. Winterization - ✔✔ANSWER✔✔-Trapped air
A low-hazard use only backflow preventer is a(n) _____?
A. Air-gap separation
B. Atmospheric vacuum breaker
C. Double check valve assembly
D. Pressure vacuum breaker assembly
E. Reduced pressure principle assembly - ✔✔ANSWER✔✔-Double check valve
assembly
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
