BACK FLOW TEST PRACTICE TEST
CORRECT 100%
what is the difference between check valve 1 and check valve 2 on a double check
valve assembly - ANSWERthe two check valves operate the same
in a perfect vacuum, water can be drawn up in a column _______ feet - ANSWER33.9
which of the following is considered to be a chemical contaminant? - ANSWERarsenic
which of the following is considered to be a biological health hazard - ANSWERgiardia
what type of assembly has two internally spring loaded check, two shut-off valves, and
four test cocks? - ANSWERdouble check valve
air gap is the_________ when directly connecting potable water supply lines to
sewerage systems or to radioactive sources? - ANSWERmost suitable protection
a bypass of a backflow prevention assemble may be permitted only if the assembly in
the bypass: - ANSWERis the same type
what federal law made water purveyors responsible for water quality all the way into
consumers' homes or businesses? - ANSWERsafe drinking water act amendment of
1986
if a column of water is exerting a pressure of 50 psi, how high must the water be inside
the column? - ANSWER115.5
as the velocity of water increases, pressure: - ANSWERdecreases
atmospheric pressure at sea level is _______ psi - ANSWER14.7
a water supply other than the water purveyor's approved supply, that is on or available
to the premises is called a - ANSWERauxiliary water supply
how can a backsiphonage action be broken - ANSWERair gap
what single difficult to regulate item is most commonly associated with cross
connections, specifically through backsiphonage? - ANSWERgarden house
the appropriate height fo an air gap is - ANSWERtwice the diameter of the pipe above
the flood rim of vessel, minimum of 1 inch
, while testing check balbe #1 on a DC, water recedes from the tuve attached to test cock
#3. The gauge should be moved to the centerline of the assembly and the static
pressure drop across the no. 1 check should be recorded. What other information
should be recorded. - ANSWERcheck valve #2 is leaking and shutoff valve #2 is leaking
at what point is the relief valve in an RP required to open - ANSWER2.0 psid
what is the minimum spring tension recommended on the #1 check valve in an RPZ -
ANSWER3 psi greater than the tension on the relief valve.
according to the USC, what is the correct height for installing an RPZ - ANSWER12
inches above grade, but no more than 36 inches
what is the correct height to install a PVB - ANSWER12 inches above the highest
downstream point.
what company or agency is responsible for testing and approving all backflow
prevention assemblies in the united states? - ANSWERfoundation of cross-connection
control & hydraulic research
backflow prevention assemblies are often installed in parallel in order to: -
ANSWERmaintain service during testing and repairs
which of the following is not a criterion for an approved assembly? - ANSWERshipped
by manufacturer in separate parts for inspection
what is the minimum pressure drop across a spring-loaded, soft-seated check valve? -
ANSWER1.0 psid
when testing a double check valve assembly, what is the correct order for closing the
shutoff valves? - ANSWERshutoff #2 , then shutoff #1
where is the relief valve of an RPZ located? - ANSWERbetween check valve #1 and
check valve #2
an atmospheric vacuum breaker is designed to protect against? - ANSWERPollutants &
contaminants, but under backsiphonage only
backflow prevention by containment means: - ANSWERplacing a backflow preventer at
the meter
what type of backflow prevention assembly would be recommended in a car wash
facility at the service connection to a potable water supply? - ANSWERRPZ
CORRECT 100%
what is the difference between check valve 1 and check valve 2 on a double check
valve assembly - ANSWERthe two check valves operate the same
in a perfect vacuum, water can be drawn up in a column _______ feet - ANSWER33.9
which of the following is considered to be a chemical contaminant? - ANSWERarsenic
which of the following is considered to be a biological health hazard - ANSWERgiardia
what type of assembly has two internally spring loaded check, two shut-off valves, and
four test cocks? - ANSWERdouble check valve
air gap is the_________ when directly connecting potable water supply lines to
sewerage systems or to radioactive sources? - ANSWERmost suitable protection
a bypass of a backflow prevention assemble may be permitted only if the assembly in
the bypass: - ANSWERis the same type
what federal law made water purveyors responsible for water quality all the way into
consumers' homes or businesses? - ANSWERsafe drinking water act amendment of
1986
if a column of water is exerting a pressure of 50 psi, how high must the water be inside
the column? - ANSWER115.5
as the velocity of water increases, pressure: - ANSWERdecreases
atmospheric pressure at sea level is _______ psi - ANSWER14.7
a water supply other than the water purveyor's approved supply, that is on or available
to the premises is called a - ANSWERauxiliary water supply
how can a backsiphonage action be broken - ANSWERair gap
what single difficult to regulate item is most commonly associated with cross
connections, specifically through backsiphonage? - ANSWERgarden house
the appropriate height fo an air gap is - ANSWERtwice the diameter of the pipe above
the flood rim of vessel, minimum of 1 inch
, while testing check balbe #1 on a DC, water recedes from the tuve attached to test cock
#3. The gauge should be moved to the centerline of the assembly and the static
pressure drop across the no. 1 check should be recorded. What other information
should be recorded. - ANSWERcheck valve #2 is leaking and shutoff valve #2 is leaking
at what point is the relief valve in an RP required to open - ANSWER2.0 psid
what is the minimum spring tension recommended on the #1 check valve in an RPZ -
ANSWER3 psi greater than the tension on the relief valve.
according to the USC, what is the correct height for installing an RPZ - ANSWER12
inches above grade, but no more than 36 inches
what is the correct height to install a PVB - ANSWER12 inches above the highest
downstream point.
what company or agency is responsible for testing and approving all backflow
prevention assemblies in the united states? - ANSWERfoundation of cross-connection
control & hydraulic research
backflow prevention assemblies are often installed in parallel in order to: -
ANSWERmaintain service during testing and repairs
which of the following is not a criterion for an approved assembly? - ANSWERshipped
by manufacturer in separate parts for inspection
what is the minimum pressure drop across a spring-loaded, soft-seated check valve? -
ANSWER1.0 psid
when testing a double check valve assembly, what is the correct order for closing the
shutoff valves? - ANSWERshutoff #2 , then shutoff #1
where is the relief valve of an RPZ located? - ANSWERbetween check valve #1 and
check valve #2
an atmospheric vacuum breaker is designed to protect against? - ANSWERPollutants &
contaminants, but under backsiphonage only
backflow prevention by containment means: - ANSWERplacing a backflow preventer at
the meter
what type of backflow prevention assembly would be recommended in a car wash
facility at the service connection to a potable water supply? - ANSWERRPZ
