BACKFLOW FROM CLASS QUESTIONS
AND ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED
A+|| UPDATED 2025
A pressure vacuum breaker backflow preventer is designed to protect the
water supply from pollution under which condition?
A: Backpressure
B: Backsiphonage
C: Water hammer
D: A and B
Answer: B: Backsiphonage
An AVB must be installed ___.
A: In a pit
B: On the discharge side of a shut-off valve
C: 6" above grade
D: 12" above the highest outlet
Answer: B: On the discharge side of a shut-off valve
Which backflow preventer is designed to protect from sewage under both
backpressure and backsiphonage conditions?
A: RPZ
B: AG
C: AVB
D: PVB
Answer: A: RPZ
The term "Air Gap" & "separation" means:
,A: a hole in the supply piping
B: a gap in the airline to supply a tank
C: a physical break between the water supply line and a receiving vessel
D: a mechanical type backflow prevention assembly -ANSWER✔✔C: A physical
break between the water supply line and a receiving vessel
True or False?
A Pressure Vacuum Breaker type backflow preventer is designed to protect from
pollution under backpressure conditions? -ANSWER✔✔False
Water closets and urinals shall be protected by a ____.
A: DC
B: PVB
C: AVB
D: SVB -ANSWER✔✔C: AVB
The overall responsibility for prevention of cross-connections under Title 17 is
vested with the ____.
A: water purveyor
B: building inspector
C: health department
D: the journeyman -ANSWER✔✔C: Health Department
, Who has the primary responsibility for preventing water from unapproved sources
entering the public water supply?
A: The Water Purveyors
B: The Health Agencies
C: The Plumbing Inspectors
D: The Water Consumers -ANSWER✔✔A: The Water Purveyors
If a serious cross-connection is discovered in a building the plumber should:
A: write it down for future reference.
B: notify the administrative authority.
C: notify the owner.
D: all the above. -ANSWER✔✔D: All of the above
True or False?
A Pressure Vacuum Breaker type backflow preventer is designed to protect from
contamination under backsiphonage conditions? -ANSWER✔✔True
A perfect vacuum at sea level will raise water in a pipe about:
A: 28'
B: 34'
C: 36'
D: 38' -ANSWER✔✔B: 34'
AND ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED
A+|| UPDATED 2025
A pressure vacuum breaker backflow preventer is designed to protect the
water supply from pollution under which condition?
A: Backpressure
B: Backsiphonage
C: Water hammer
D: A and B
Answer: B: Backsiphonage
An AVB must be installed ___.
A: In a pit
B: On the discharge side of a shut-off valve
C: 6" above grade
D: 12" above the highest outlet
Answer: B: On the discharge side of a shut-off valve
Which backflow preventer is designed to protect from sewage under both
backpressure and backsiphonage conditions?
A: RPZ
B: AG
C: AVB
D: PVB
Answer: A: RPZ
The term "Air Gap" & "separation" means:
,A: a hole in the supply piping
B: a gap in the airline to supply a tank
C: a physical break between the water supply line and a receiving vessel
D: a mechanical type backflow prevention assembly -ANSWER✔✔C: A physical
break between the water supply line and a receiving vessel
True or False?
A Pressure Vacuum Breaker type backflow preventer is designed to protect from
pollution under backpressure conditions? -ANSWER✔✔False
Water closets and urinals shall be protected by a ____.
A: DC
B: PVB
C: AVB
D: SVB -ANSWER✔✔C: AVB
The overall responsibility for prevention of cross-connections under Title 17 is
vested with the ____.
A: water purveyor
B: building inspector
C: health department
D: the journeyman -ANSWER✔✔C: Health Department
, Who has the primary responsibility for preventing water from unapproved sources
entering the public water supply?
A: The Water Purveyors
B: The Health Agencies
C: The Plumbing Inspectors
D: The Water Consumers -ANSWER✔✔A: The Water Purveyors
If a serious cross-connection is discovered in a building the plumber should:
A: write it down for future reference.
B: notify the administrative authority.
C: notify the owner.
D: all the above. -ANSWER✔✔D: All of the above
True or False?
A Pressure Vacuum Breaker type backflow preventer is designed to protect from
contamination under backsiphonage conditions? -ANSWER✔✔True
A perfect vacuum at sea level will raise water in a pipe about:
A: 28'
B: 34'
C: 36'
D: 38' -ANSWER✔✔B: 34'
