back flow test practice test.
what is the difference between check valve 1 and check valve 2 on a double check
valve assembly - ANS-the two check valves operate the same
in a perfect vacuum, water can be drawn up in a column _______ feet - ANS-33.9
which of the following is considered to be a chemical contaminant? - ANS-arsenic
which of the following is considered to be a biological health hazard - ANS-giardia
what type of assembly has two internally spring loaded check, two shut-off valves, and
four test cocks? - ANS-double check valve
air gap is the_________ when directly connecting potable water supply lines to
sewerage systems or to radioactive sources? - ANS-most suitable protection
a bypass of a backflow prevention assemble may be permitted only if the assembly in
the bypass: - ANS-is the same type
what federal law made water purveyors responsible for water quality all the way into
consumers' homes or businesses? - ANS-safe 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? - ANS-115.5
as the velocity of water increases, pressure: - ANS-decreases
atmospheric pressure at sea level is _______ psi - ANS-14.7
a water supply other than the water purveyor's approved supply, that is on or available
to the premises is called a - ANS-auxiliary water supply
how can a backsiphonage action be broken - ANS-air gap
what single difficult to regulate item is most commonly associated with cross
connections, specifically through backsiphonage? - ANS-garden house
, the appropriate height fo an air gap is - ANS-twice 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. - ANS-check valve #2 is leaking and shutoff valve #2 is leaking
at what point is the relief valve in an RP required to open - ANS-2.0 psid
what is the minimum spring tension recommended on the #1 check valve in an RPZ -
ANS-3 psi greater than the tension on the relief valve.
according to the USC, what is the correct height for installing an RPZ - ANS-12 inches
above grade, but no more than 36 inches
what is the correct height to install a PVB - ANS-12 inches above the highest
downstream point.
what company or agency is responsible for testing and approving all backflow
prevention assemblies in the united states? - ANS-foundation of cross-connection
control & hydraulic research
backflow prevention assemblies are often installed in parallel in order to: - ANS-maintain
service during testing and repairs
which of the following is not a criterion for an approved assembly? - ANS-shipped by
manufacturer in separate parts for inspection
what is the minimum pressure drop across a spring-loaded, soft-seated check valve? -
ANS-1.0 psid
when testing a double check valve assembly, what is the correct order for closing the
shutoff valves? - ANS-shutoff #2 , then shutoff #1
where is the relief valve of an RPZ located? - ANS-between check valve #1 and check
valve #2
an atmospheric vacuum breaker is designed to protect against? - ANS-Pollutants &
contaminants, but under backsiphonage only
what is the difference between check valve 1 and check valve 2 on a double check
valve assembly - ANS-the two check valves operate the same
in a perfect vacuum, water can be drawn up in a column _______ feet - ANS-33.9
which of the following is considered to be a chemical contaminant? - ANS-arsenic
which of the following is considered to be a biological health hazard - ANS-giardia
what type of assembly has two internally spring loaded check, two shut-off valves, and
four test cocks? - ANS-double check valve
air gap is the_________ when directly connecting potable water supply lines to
sewerage systems or to radioactive sources? - ANS-most suitable protection
a bypass of a backflow prevention assemble may be permitted only if the assembly in
the bypass: - ANS-is the same type
what federal law made water purveyors responsible for water quality all the way into
consumers' homes or businesses? - ANS-safe 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? - ANS-115.5
as the velocity of water increases, pressure: - ANS-decreases
atmospheric pressure at sea level is _______ psi - ANS-14.7
a water supply other than the water purveyor's approved supply, that is on or available
to the premises is called a - ANS-auxiliary water supply
how can a backsiphonage action be broken - ANS-air gap
what single difficult to regulate item is most commonly associated with cross
connections, specifically through backsiphonage? - ANS-garden house
, the appropriate height fo an air gap is - ANS-twice 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. - ANS-check valve #2 is leaking and shutoff valve #2 is leaking
at what point is the relief valve in an RP required to open - ANS-2.0 psid
what is the minimum spring tension recommended on the #1 check valve in an RPZ -
ANS-3 psi greater than the tension on the relief valve.
according to the USC, what is the correct height for installing an RPZ - ANS-12 inches
above grade, but no more than 36 inches
what is the correct height to install a PVB - ANS-12 inches above the highest
downstream point.
what company or agency is responsible for testing and approving all backflow
prevention assemblies in the united states? - ANS-foundation of cross-connection
control & hydraulic research
backflow prevention assemblies are often installed in parallel in order to: - ANS-maintain
service during testing and repairs
which of the following is not a criterion for an approved assembly? - ANS-shipped by
manufacturer in separate parts for inspection
what is the minimum pressure drop across a spring-loaded, soft-seated check valve? -
ANS-1.0 psid
when testing a double check valve assembly, what is the correct order for closing the
shutoff valves? - ANS-shutoff #2 , then shutoff #1
where is the relief valve of an RPZ located? - ANS-between check valve #1 and check
valve #2
an atmospheric vacuum breaker is designed to protect against? - ANS-Pollutants &
contaminants, but under backsiphonage only
