Water Distribution D2 California Practice
Exam 2026 D2 water Distribution Test
Exam Latest Update 2026 Questions and
Correct Answers Rated A+
The Difference between the static ground water level and the
pumping level is the -Answer-drawdown
A customer complaint about the presence of brown floc in tap
water can best be handled by -Answer-investigating the problem
as soon as possible
The term "aquifer" relates to which one of the following ? -
Answer-groundwater
One indication of corrosive water is a high concentration of -
Answer-Carbon dioxide
Catholic protection means protection against -Answer-Corrosion
The primary reason for the use of a dry barrel fire hydrant is to -
Answer-keep the hydrant from freezing
The component parts of a well include all of the following except -
Answer-pressure switch
At the same barometric pressure, the amount of dissolved oxygen
in cold water tends to be ............ The amount of dissolved oxygen
in the warm water -Answer-more than
,Which of the following is the principal constituent in water that
causes corrosion of metals? -Answer-dissolved oxygen
Which component of a centritugal pump moves the water? -
Answer-impeller
A record containing the size, location, and ties of water mains;
valves; hydrants; tanks; reservoirs; and pump stations is called a -
Answer-comprehensive map
What term describes water that is suitable for drinking -Answer-
potable
A pump delivering 288,000 gallons of water in 24 hours operates
at what average flow rate? -Answer-200 gallons per minute
Velocity of flow in mains is usually expressed in terms of -Answer-
Feet per second
A competent person at an excavation work site -Answer-Is
capable of identifying hazarda and has the authority to take
corrrective measures.
Hydrogen sulfide gas smells like -Answer-rotten eggs
Which of the following methods can be used to renove high iron
content from a well supply? -Answer-oxidation and filtration.
,Hardness may be expressed in -Answer-Milligrams per litre as
caco3
The basic unit of electrical power is the -Answer-Watt
A standpipe is 84 inches in diameter and 20 feet high. How many
gallons are in the standpipe when the water is 16 feet deep? -
Answer-4,603
Check valves are used to -Answer-permit flow in only one
direction
Standard pumper connection fire hydrant should not be installed
on water mains smaller then ----inches in diameter. -Answer-6
Beards or long sideburns prohibit an operator from safely -
Answer-wearing the face mask of a self contained breathing
apparatus.
The water table is defined as the -Answer-upper surface of the
groundwater.
The shaft speed of an electric motor is most commonly expressed
in units of -Answer-revolutions per minute
A coupon test installation in a distribution system is used to -
Answer-determine the rate scaling or corrosion.
Disease causing bacteria are know as -Answer-pathogenic
, Normally, surface water and groundwater have a PH range of -
Answer-6.8 to 8.5
Which is the best definition of turbidity in water? -Answer-anything
in water that scatters light
A competent person must inspect excavations and adjacent areas
for hazards -Answer-daily, prior to the start of work, and as
needed throughout the shift.
The component of a centrifugal pump sometimes installed on the
end of a suction pipe to hold the priming is known as a -Answer-
foot valve
The principal purpose of an altitude valve on an elevated tank is
to -Answer-control maximum filling level in distribution storage.
The term primacy means the -Answer-authority by the states to
supersede the USEPA drinking water regulations.
Reciprocating positive displacement pumps are also known as -
Answer-Piston pumps
Modertely hard water will have a hardness range of ----- mg/L as -
Answer-61 to 120
A common method for removing hydrogen sulfide from water is -
Answer-aeration
Exam 2026 D2 water Distribution Test
Exam Latest Update 2026 Questions and
Correct Answers Rated A+
The Difference between the static ground water level and the
pumping level is the -Answer-drawdown
A customer complaint about the presence of brown floc in tap
water can best be handled by -Answer-investigating the problem
as soon as possible
The term "aquifer" relates to which one of the following ? -
Answer-groundwater
One indication of corrosive water is a high concentration of -
Answer-Carbon dioxide
Catholic protection means protection against -Answer-Corrosion
The primary reason for the use of a dry barrel fire hydrant is to -
Answer-keep the hydrant from freezing
The component parts of a well include all of the following except -
Answer-pressure switch
At the same barometric pressure, the amount of dissolved oxygen
in cold water tends to be ............ The amount of dissolved oxygen
in the warm water -Answer-more than
,Which of the following is the principal constituent in water that
causes corrosion of metals? -Answer-dissolved oxygen
Which component of a centritugal pump moves the water? -
Answer-impeller
A record containing the size, location, and ties of water mains;
valves; hydrants; tanks; reservoirs; and pump stations is called a -
Answer-comprehensive map
What term describes water that is suitable for drinking -Answer-
potable
A pump delivering 288,000 gallons of water in 24 hours operates
at what average flow rate? -Answer-200 gallons per minute
Velocity of flow in mains is usually expressed in terms of -Answer-
Feet per second
A competent person at an excavation work site -Answer-Is
capable of identifying hazarda and has the authority to take
corrrective measures.
Hydrogen sulfide gas smells like -Answer-rotten eggs
Which of the following methods can be used to renove high iron
content from a well supply? -Answer-oxidation and filtration.
,Hardness may be expressed in -Answer-Milligrams per litre as
caco3
The basic unit of electrical power is the -Answer-Watt
A standpipe is 84 inches in diameter and 20 feet high. How many
gallons are in the standpipe when the water is 16 feet deep? -
Answer-4,603
Check valves are used to -Answer-permit flow in only one
direction
Standard pumper connection fire hydrant should not be installed
on water mains smaller then ----inches in diameter. -Answer-6
Beards or long sideburns prohibit an operator from safely -
Answer-wearing the face mask of a self contained breathing
apparatus.
The water table is defined as the -Answer-upper surface of the
groundwater.
The shaft speed of an electric motor is most commonly expressed
in units of -Answer-revolutions per minute
A coupon test installation in a distribution system is used to -
Answer-determine the rate scaling or corrosion.
Disease causing bacteria are know as -Answer-pathogenic
, Normally, surface water and groundwater have a PH range of -
Answer-6.8 to 8.5
Which is the best definition of turbidity in water? -Answer-anything
in water that scatters light
A competent person must inspect excavations and adjacent areas
for hazards -Answer-daily, prior to the start of work, and as
needed throughout the shift.
The component of a centrifugal pump sometimes installed on the
end of a suction pipe to hold the priming is known as a -Answer-
foot valve
The principal purpose of an altitude valve on an elevated tank is
to -Answer-control maximum filling level in distribution storage.
The term primacy means the -Answer-authority by the states to
supersede the USEPA drinking water regulations.
Reciprocating positive displacement pumps are also known as -
Answer-Piston pumps
Modertely hard water will have a hardness range of ----- mg/L as -
Answer-61 to 120
A common method for removing hydrogen sulfide from water is -
Answer-aeration
