Water Distribution Exam Questions and
Answers Verified 100% Correct
What is the most common type meter used for domestic services? - ANSWER
Nutating Disc
The combination of the displacement type (low flow) and velocity type (high
flow) meters are called a _____________ meter. - ANSWER Compound meter
In what year was the Safe Drinking Water Act passed? - ANSWER 1974
What is the available chlorine of calcium hypochlorite? - ANSWER 65%
A reverse flow condition, created by a difference in water pressures which causes water
to flow back into the distribution system is referred to as what? - ANSWER Backflow
The maximum height in which water will rise in a perfect vacuum above a free surface
of water is: - ANSWER 33.9ft
Backflow that is caused by a sub atmospheric or negative pressure within a
water system is known as: - ANSWER Backsiphonage
A backflow prevention assembly that consists of two independently acting approved
check valves together with a hydraulically operating, mechanically independent
pressure differential relief valve located between the check valves would describe a -
ANSWER Reduce pressure principle assembly
, The unobstructed vertical distance through free atmosphere from the tip of a supply
outlet or faucet supplying water to a tank or other receiving vessel and the flood
level rim of the receptacle is called a/an: - ANSWER Air gap
About ____% or more of the storage capacity of the distribution system should normally
be reserved for fire demand and emergency use. - ANSWER 35%
Sodium Hypochlorite contains approximately ______% available chlorine. - ANSWER 5
to 15%
Who is responsible for setting drinking water standards and ensuring their
enforcement? - ANSWER U.S. EPA
What year was the Safe Water Drinking Act amended? - ANSWER 1986
A new well must be disinfected at the well, pump and screen with a ____mg/l solution. -
ANSWER 50
Before disinfecting mains you must first ______ them. - ANSWER Flush
When flushing mains you must flush with a minimum velocity of at least ____ft/sec. -
ANSWER 2.5
The maximum rate of chlorine removal from a 150lb cylinder is ___lbs per day
or freezing will occur. - ANSWER 40
The 1991 Uniform Fire Code states that the exhaust fan for chlorine must be taken
from - ANSWER A point within 12 inches from the floor
Answers Verified 100% Correct
What is the most common type meter used for domestic services? - ANSWER
Nutating Disc
The combination of the displacement type (low flow) and velocity type (high
flow) meters are called a _____________ meter. - ANSWER Compound meter
In what year was the Safe Drinking Water Act passed? - ANSWER 1974
What is the available chlorine of calcium hypochlorite? - ANSWER 65%
A reverse flow condition, created by a difference in water pressures which causes water
to flow back into the distribution system is referred to as what? - ANSWER Backflow
The maximum height in which water will rise in a perfect vacuum above a free surface
of water is: - ANSWER 33.9ft
Backflow that is caused by a sub atmospheric or negative pressure within a
water system is known as: - ANSWER Backsiphonage
A backflow prevention assembly that consists of two independently acting approved
check valves together with a hydraulically operating, mechanically independent
pressure differential relief valve located between the check valves would describe a -
ANSWER Reduce pressure principle assembly
, The unobstructed vertical distance through free atmosphere from the tip of a supply
outlet or faucet supplying water to a tank or other receiving vessel and the flood
level rim of the receptacle is called a/an: - ANSWER Air gap
About ____% or more of the storage capacity of the distribution system should normally
be reserved for fire demand and emergency use. - ANSWER 35%
Sodium Hypochlorite contains approximately ______% available chlorine. - ANSWER 5
to 15%
Who is responsible for setting drinking water standards and ensuring their
enforcement? - ANSWER U.S. EPA
What year was the Safe Water Drinking Act amended? - ANSWER 1986
A new well must be disinfected at the well, pump and screen with a ____mg/l solution. -
ANSWER 50
Before disinfecting mains you must first ______ them. - ANSWER Flush
When flushing mains you must flush with a minimum velocity of at least ____ft/sec. -
ANSWER 2.5
The maximum rate of chlorine removal from a 150lb cylinder is ___lbs per day
or freezing will occur. - ANSWER 40
The 1991 Uniform Fire Code states that the exhaust fan for chlorine must be taken
from - ANSWER A point within 12 inches from the floor
