BACKFLOW ACTUAL EXAMINATION TEST
2026 QUESTIONS AND SOLUTIONS
GRADED A+ COMPLETE ANSWERS
●● 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
●● 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.
2026 QUESTIONS AND SOLUTIONS
GRADED A+ COMPLETE ANSWERS
●● 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
●● 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.
