back flow test practice test.Questions With 100% Correct Answers.

what is the difference between check valve 1 and check valve 2 on a double check valve assembly - Answer-the two check valves operate the same in a perfect vacuum, water can be drawn up in a column _______ feet - Answer-33.9 which of the following is considered to be a chemical contaminant? - Answer-arsenic which of the following is considered to be a biological health hazard - Answer-giardia what type of assembly has two internally spring loaded check, two shut-off valves, and four test cocks? - Answer-double check valve air gap is the_________ when directly connecting potable water supply lines to sewerage systems or to radioactive sources? - Answer-most suitable protection a bypass of a backflow prevention assemble may be permitted only if the assembly in the bypass: - Answer-is the same type what federal law made water purveyors responsible for water quality all the way into consumers' homes or businesses? - Answer-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? - Answer-115.5 as the velocity of water increases, pressure: - Answer-decreases atmospheric pressure at sea level is _______ psi - Answer-14.7a water supply other than the water purveyor's approved supply, that is on or available to the premises is called a - Answer-auxiliary water supply how can a backsiphonage action be broken - Answer-air gap what single difficult to regulate item is most commonly associated with cross connections, specifically through backsiphonage? - Answer-garden house the appropriate height fo an air gap is - Answer-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. - Answer-check valve #2 is leaking and shutoff valve #2 is leaking at what point is the relief valve in an RP required to open - Answer-2.0 psid what is the minimum spring tension recommended on the #1 check valve in an RPZ - Answer-3 psi greater than the tension on the relief valve. according to the USC, what is the correct height for installing an RPZ - Answer-12 inches above grade, but no more than 36 inches what is the correct height to install a PVB - Answer-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? - Answer-foundation of cross-connection control & hydraulic research