Water Distribution D2 California Practice test Exam Questions and Revised Answers –

Water Distribution D2 California Practice test Exam Questions
and Revised Answers –2026-2027




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?


ANSWERS: 4,603


Check valves are used to


ANSWERS: permit flow in only one driection


Standard pumper connection fire hydranta should not be installed on
water mains smaller then inches in diameter.


ANSWERS: 6


Beards or long sideburns prohibit an operator from safely


ANSWERS: wearing the face mask of a self contained breathing apparatus.


The water table is defined as the


ANSWERS: upper surface of the groundwater.


The shaft speed of an electric motor is most commonly expressed in units of


ANSWERS: revolutions per minute

, A coupon test installation in a distribution system is used to


ANSWERS: determine the rate scaling or corrosion.


Disease causing bacteria are know as


ANSWERS: pathogenic


Normally, surface water and groundwater have a PH range of


ANSWERS: 6.8 to 8.5


Which is the best definition of turbidity in water?


ANSWERS: anything in water that scatters light


A competent person must inspect excavations and adjacent areas for hazards


ANSWERS: 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


ANSWERS: foot valve


The principal purpose of an altitude valve on an elevated tank is to


ANSWERS: control maximum filling level in distribution storage.