Backflow Prevention Practice Exam questions
with solved solutions
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
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
with solved solutions
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
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
