Backflow Prevention Practice Exam
Questions with Correct 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 - ANSWERSService 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 - ANSWERSRepaired 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) - ANSWERS5.5 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 - ANSWERSAesthetically 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 - ANSWERSLess 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 - ANSWERSTemporary 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 - ANSWERSAppliance 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 - ANSWERSBackpressure or backsiphonage
A pipe restriction's flow velocity increase may allow ____?
A. Aspiration
B. Backpressure
C. Low turbulence
D. Pressure head
E. Pressure surges - ANSWERSAspiration
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 - ANSWERSDeath
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 - ANSWERSAllow 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 - ANSWERSPlumbing 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 - ANSWERSCheck 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) - ANSWERS1 in. (2.5 cm)
A hose-bibb connection is required to have a permanently installed ____?
A. Atmospheric vacuum breaker
B. Backflow preventer
C. Pressure vacuum breaker
D. Shut-off valve
E. Spill-resistant vacuum breaker - ANSWERSAtmospheric vacuum breaker
Atmospheric vacuum breakers must not be subject to continuous water pressure for
more than ___ hr.
A. 3
B. 6
C. 12
D. 18
E. 24 - ANSWERS12
A submerged atmospheric vacuum breaker may be considered a(n) _____?
A. Backflow preventer
B. Cross-connection
C. Expensive elbow
D. Typical installation
E. Useful training photo - ANSWERS. Cross-connection
Flow from the outlet of an atmospheric vacuum breaker must not reach a _____?
A. Closed tank
B. Section of straight tubing
C. Submerged inlet
D. Toxic substance
E. Valve - ANSWERSValve
Questions with Correct 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 - ANSWERSService 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 - ANSWERSRepaired 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) - ANSWERS5.5 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 - ANSWERSAesthetically 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 - ANSWERSLess 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 - ANSWERSTemporary 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 - ANSWERSAppliance 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 - ANSWERSBackpressure or backsiphonage
A pipe restriction's flow velocity increase may allow ____?
A. Aspiration
B. Backpressure
C. Low turbulence
D. Pressure head
E. Pressure surges - ANSWERSAspiration
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 - ANSWERSDeath
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 - ANSWERSAllow 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 - ANSWERSPlumbing 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 - ANSWERSCheck 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) - ANSWERS1 in. (2.5 cm)
A hose-bibb connection is required to have a permanently installed ____?
A. Atmospheric vacuum breaker
B. Backflow preventer
C. Pressure vacuum breaker
D. Shut-off valve
E. Spill-resistant vacuum breaker - ANSWERSAtmospheric vacuum breaker
Atmospheric vacuum breakers must not be subject to continuous water pressure for
more than ___ hr.
A. 3
B. 6
C. 12
D. 18
E. 24 - ANSWERS12
A submerged atmospheric vacuum breaker may be considered a(n) _____?
A. Backflow preventer
B. Cross-connection
C. Expensive elbow
D. Typical installation
E. Useful training photo - ANSWERS. Cross-connection
Flow from the outlet of an atmospheric vacuum breaker must not reach a _____?
A. Closed tank
B. Section of straight tubing
C. Submerged inlet
D. Toxic substance
E. Valve - ANSWERSValve
