Backflow Prevention Study Guide
(Charleston Water Systems)
Questions and Correct Answers
Name the two types of backflow. - <CORRECT ANSWER >>Backpressure and Backsiphonage
All of the following may be considered acceptable for containment of a building with the
exception of a(n):
a) Air Gap
b) Double Check Valve Assembly
c) Residential Dual Check
d) Reduced Pressure Backflow Assembly
e) Pressure Vacuum Breaker Assembly - <CORRECT ANSWER >>e) Pressure Vacuum Breaker
Assembly
A Reduced Pressure Backflow Assembly (RP) protects against:
a) High hazard, Backpressure
b) High hazard, Backsiphonage
c) Low hazard, Backpressure & Backsiphonage
d) All of the above - <CORRECT ANSWER >>d) All of the above
How many test cocks are on a Reduced Pressure Backflow Assembly? - <CORRECT ANSWER >>4
How many test cocks are on a Double Check Valve Assembly? - <CORRECT ANSWER >>4
How many test cocks are on a Pressure Vacuum Breaker Assembly? - <CORRECT ANSWER >>2
, How many test cocks are on an Atmospheric Vacuum Breaker? - <CORRECT ANSWER >>0
True/False: Test Gauges should be properly stored to ensure they are not damaged when not in
use. - <CORRECT ANSWER >>True
A Backflow Preventer for Beverage Dispensing Equipment protects against carbon dioxide from
entering the potable water supply from which type of backflow?
a) Backpressure
b) Backsiphonage
c) Both A & B
d) None of the above - <CORRECT ANSWER >>c) Both A & B
A Residential Dual Check Backflow Preventer has:
a) Two Independently Acting Checks
b) Two Independently Acting Checks and an Atmospheric Port
c) Two Independently Acting Checks with a relief valve
d) None of the Above - <CORRECT ANSWER >>a) Two Independently Acting Checks
What is the best form or method backflow prevention?
a) A Double Check Valve Assembly
b) A Reduced Pressure Backflow Assembly
c) A Reduced Pressure Detector Assembly
d) An Air Gap - <CORRECT ANSWER >>d) An Air Gap
A Reduced Pressure Backflow Assembly must be installed:
a) No lower then 12-inches and no higher than 72-inches
b) No lower than 6-inches and no higher than 60-higher
c) Min. 12" or as outlined in the Water Purveyors Cross-Connection Control Program
(Charleston Water Systems)
Questions and Correct Answers
Name the two types of backflow. - <CORRECT ANSWER >>Backpressure and Backsiphonage
All of the following may be considered acceptable for containment of a building with the
exception of a(n):
a) Air Gap
b) Double Check Valve Assembly
c) Residential Dual Check
d) Reduced Pressure Backflow Assembly
e) Pressure Vacuum Breaker Assembly - <CORRECT ANSWER >>e) Pressure Vacuum Breaker
Assembly
A Reduced Pressure Backflow Assembly (RP) protects against:
a) High hazard, Backpressure
b) High hazard, Backsiphonage
c) Low hazard, Backpressure & Backsiphonage
d) All of the above - <CORRECT ANSWER >>d) All of the above
How many test cocks are on a Reduced Pressure Backflow Assembly? - <CORRECT ANSWER >>4
How many test cocks are on a Double Check Valve Assembly? - <CORRECT ANSWER >>4
How many test cocks are on a Pressure Vacuum Breaker Assembly? - <CORRECT ANSWER >>2
, How many test cocks are on an Atmospheric Vacuum Breaker? - <CORRECT ANSWER >>0
True/False: Test Gauges should be properly stored to ensure they are not damaged when not in
use. - <CORRECT ANSWER >>True
A Backflow Preventer for Beverage Dispensing Equipment protects against carbon dioxide from
entering the potable water supply from which type of backflow?
a) Backpressure
b) Backsiphonage
c) Both A & B
d) None of the above - <CORRECT ANSWER >>c) Both A & B
A Residential Dual Check Backflow Preventer has:
a) Two Independently Acting Checks
b) Two Independently Acting Checks and an Atmospheric Port
c) Two Independently Acting Checks with a relief valve
d) None of the Above - <CORRECT ANSWER >>a) Two Independently Acting Checks
What is the best form or method backflow prevention?
a) A Double Check Valve Assembly
b) A Reduced Pressure Backflow Assembly
c) A Reduced Pressure Detector Assembly
d) An Air Gap - <CORRECT ANSWER >>d) An Air Gap
A Reduced Pressure Backflow Assembly must be installed:
a) No lower then 12-inches and no higher than 72-inches
b) No lower than 6-inches and no higher than 60-higher
c) Min. 12" or as outlined in the Water Purveyors Cross-Connection Control Program
