Backflow Prevention Study Guide – Charleston Water System Exam Prep – Full Q&A with Correct Answers and Explanations

Backflow Prevention Study Guide (Charleston Water
Systems) questions with accurate answers
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 Ans✓✓✓ c) Both A & B


A backflow preventer which creates a closed plumbing system may
require the installation a(n):
a) pressure regulator
b) altitude valve
c) control valve
d) thermal expansion tank
e) pressure gauge Ans✓✓✓ d) thermal expansion tank


A piece of equipment with a supply link that is 1/4" in diameter requires
an air gap of how many inches?
a) 1"
b) 1/2"
c) 3/4"
d) 2" Ans✓✓✓ a) 1"

, 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 Ans✓✓✓ d) All of the above


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
d) None of the above Ans✓✓✓ c) Min. 12" or as outlined in the Water
Purveyors Cross-Connection Control Program


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 Ans✓✓✓ a) Two Independently Acting Checks


A restriction or reduction in a pipe may cause water velocity to increase,
thereby allowing for what type of backsiphonage? Ans✓✓✓ Venturi or
Aspiration