BACKFLOW PREVENTION PRACTICE
EXAM QUESTIONS WITH VERIFIED
ANSWERS. A+ GRADE 2025/2026.
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 - ANS 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 - ANS 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)
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
,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) - ANS 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 - ANS 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 - ANS 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 - ANS Temporary hose bibb connection
The isolation of a plumbing water system hazard requires____?
A. Appliance protection
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, B. Building quarantine
C. High-hazard protection
D. Meter protection
E. Toxin monitoring - ANS 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 - ANS 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 - ANS 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 - ANS Death
To prevent backflow, an atmospheric vacuum breaker is primarily designed to ____?
A. Allow air into the outlet piping system
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
EXAM QUESTIONS WITH VERIFIED
ANSWERS. A+ GRADE 2025/2026.
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 - ANS 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 - ANS 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)
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
,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) - ANS 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 - ANS 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 - ANS 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 - ANS Temporary hose bibb connection
The isolation of a plumbing water system hazard requires____?
A. Appliance protection
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, B. Building quarantine
C. High-hazard protection
D. Meter protection
E. Toxin monitoring - ANS 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 - ANS 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 - ANS 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 - ANS Death
To prevent backflow, an atmospheric vacuum breaker is primarily designed to ____?
A. Allow air into the outlet piping system
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
