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Backflow Prevention Practice Exam With Answers (100 Solved Questions)

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    BACKFLOW PREVENT ION ASSEMBLY TESTER PRACTICE EXAM QUESTIONS AND ACCURATE ASNWERS //GRADED A+ In r esponding to a backflow incident the water purveyor should (A) Call the mayor (B) Implement the emergency response plan (C) Install a vacuum breaker (D) Develop a good excuse - answer - Implement the emergency response plan A mixture of air and gas is considered hazardous when the mixture exceeds what percentage of gthe lower explosive limit (A) 0% (B) 3% (C) 7% (D) 10% - answer - 10% To exert a pressure of 1.0 psi at base of a water column the column would have to be (A) 4.34 high (B) 14.7 high (C) 27.75 high (D) 33.89 high - answer - 27.75 high A DC must be tested (A) Upon installation (B) Every 6 month (C) Annually on a health hazard (D) none of the above - answer - Upon installation An absolute perssure of 25 psiaa (at sea level) is equal to approximately (A) 5 psi

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    (B) 10 psi (C) 20 psi (D) 25 psi - answer - 10 psi Dueing a field test the air inlet on PVB must open at (A) Above 2.0 psid (B) Below 1.0 psid (C) Above 1.0 psid (D) Below 2.0 psid - answer - Above 1.0 psid A differential pressuer gauge is used to field test (A) PVB's (B) Dual Checks (C) AVB's (D) All the above - answer - PVB's Backflow in a water supply can be caused by (A) Backpressure only (B) A Barometric Loop (C) Backsiphonage only (D) Backpressure and Backsiphonage - answer - Backpressure and Backsiphonage A BPA T tester is required to report test information on the proper forms to the (A) Administrative authority (B) Manufacturer's Rep (C) EPA (D) None of the above - answer - Administrative authority The relief valve opens when closing #2 shut off valve on a RP What is the most probable cause

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    (A) #1 Shu t off valve is open (B) #2 Shut off valve is open (C) #1 check is fouled open (D) Shut off is leaking - answer - #1 check is fouled open When field testing the #1 Check of a RP the differential pressurw shouid be (A) Greter than or equal to 5.0 psid (B) 3.0 psid greater than the relief valve opening point (C) 1.0 psid in the directiom of flow (D) Less than 5.0 psid - answer - Greter than or equal to 5.0 psid When testing a SVB what is the firsrt test being performed (A) The air inlet opening point (B) The static pressure across the check valve (C) To verify the #2shut off hold tight (D) To check if the SVB hold water - answer - The static pressure across the check valve When testing a PVB the air inlet opens upon closing the #1 shut off valve What is the most probable cause (A) Leaking #2 shut off valve (B) Leaking #1 shut off valve (C) Fouied air inlert (D) Fouied check valve - answer - Leaking #2 shut off valve A 2" AVB when used on irrigation systemsterm - 15 shall be instilled (A) 6" above all downstream piping (B) 18" above all downstream piping (C) 24" above all downstream piping (D) 27 3/4" above all downstream piping - answer - 6" above all downstream piping

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    What causes the relief valief valve to close on a RPZ? (A) Reilef valve spring pressure (B) Supply side water pressure (C) Pressure differential between Check #1 and Check #2 (D) All the above - answer - Supply side water pressure When testing a RP instialled in vauil the relief valve opening point falls to zero What is most probabie cause (A) The relief valve is stuck shut (B) #1 check is fouled (C) the #2 shut off leaks by (D) Installed improperly - answer - Installed improperly When field testing the DC the #1 check static differential pressure is found to be 0.0 psid What is the most probable cause (A) Fouied #2 Check (B) Leaking #2 shut off (C) Fouled #1 check (D) Leaking #1 shut off - answer - Fouled #1 check The critical level for checking the air inlet of the PVB is (A) At the air inlet (B) At #1 shut off (C) At #1 test cock (D) At #2 shut off - answer - At the air inlet The physical operation of a Hose Bibb Vacuum Breaker is classified as a type of (A) Dual check valve

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    (B) Atmospherlc vacuum breaker (C) Pressure vacuum breaker (D) Doubie check backflow preventer - answer - Atmospherlc vacuum breaker An oxygen deficien t atmosphere has less than what precentage of oxygen (A) 19.50% (B) 10% (C) 21% (D) 24% - answer - 19.50 The relief valve of a RP discharges in flow and non - flow condition What is the most probable cause (A) Fouied #1 check (B) Fouied #2 check (C) Fou ied relief valve (D) Line pressure fiuctuation - answer - Fouied relief valve A PVB may be installed with (A) A pump downstream (B) A water heater downstream (C) A shutoff valve downstream (D) An eievated storage tank downstream - answer - A shutoff valve downstream The relief valve of a Reduced Pressure Principle Assmbly remains closed during normal operation due to (A) Supply side pressure (B) The relief valve spring (C) Zone pressure (D) All the above - answer - The relief valve spring

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    What would cause a continual flow of water from of water the air inlet of a PVB prior strting the field test (A) #2 shut off leaking by with baclpressure (B) Fouled ckeck valve (C) #1 shull off leaking by (D) Fouled air inlet - answer - Fouled air inlet A PVB can be installed in the following conditions (A) Backpressure (B) Backsiphonage (C) B and D (D) Pollutants and Contaminants - answer - B Backsiphonage and D Pollutants and Contaminants When testi ng the check valve ob a SVB the water will not stop flowing What is the most probabie cause (A) #2 shut off valve leaks by (B) #1 shut off valve leaks by (C) check valve is fouled (D) None of the above - answer - #1 shut off valve leaks by Which of the following could cause a closed system if installed in the sevice line (A) Hose bibb (B) Backflow Prevention Assembly (C) venturi (D) T & P valve - answer - Backflow Prevention Assembly The critical level when testing the SVB is (A) At the air inlet (B) At the #1 shutoff valve (C) At the vent screw

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    (D) there is on critical level - answer - At the vent screw During the test of the check valve on a Pvb water continues to flow from the #2 test cock What is the most probabie (A) Leaking #1 s hut off valve (B) Fouied air inlet (C) Fouied ckeck valve (D) Incorrect test procedure - answer - Leaking #1 shut off valve Which of the following backflow assmblies are allowable for use against a contaminant when the backflow could be caused by backpre ssure (A) Atmospheric vacuum breaker (B) Doubie check valve assembly (C) Pressure vacuum breaker assembly (D) Redued pressure backflow assembly - answer - Redued pressure backflow assembly While testing a backflow device under the influence of direct cross connection it is observed that the hazard preset is a pollutant Which assembly is appropriate for protection (A) AVB , PVB , Air Gap (B) RP , DC , SVB (C) Air Gap , RP , DC (D) Barome tric Loop - answer - Air Gap , RP , DC How many test cocks are required on a RP (A) 1 (B) 2 (C) 3 (D) 4 - answer - 4 What is the primary consideration when deciding whether ro install a DC or a RP

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