Backflow Prevention Assembly Testing and Maintenance, Exams of Nursing

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BPAT EXAM BACKFLOW PREVENTION

ASSEMBLY TESTER EXAM LATEST 2024

ACTUAL EXAM QUESTIONS AND

CORRECT DETAILED ANSWERS

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A water supplier may interrupt water service to a (user/ customer) when? Correct Answer provisions in the cross connection control ordinance or regulations are not met Backflow in a public water supply can be caused by? Correct Answer backpressure or backsiphonage An atmospheric vacuum breaker may have a downstream shutoff valve? Correct Answer under no circumstances The 1996 Federal Safe Drinking Water Act places the primary responsibility for the quality of the public water supply on which of the following? Correct Answer water purveyor An air gap must have? Correct Answer two times the pipe diameter with a minimum of inch seperation An unprotected by-pass around a reduced pressure principle backflow prevention assembly is? Correct Answer not permissible The major concerns of the water purveyor where an auxiliary water supply is utilized or maintained is to ensure that? Correct Answer backflow protection is provided at the water service connection

A pressure vacuum breaker may be installed with a (n)? Correct Answer shutoff valve downstream Two types of cross-connections are? Correct Answer direct and indirect When non-toxic antifreeze chemicals are added to a fire suppressions system, which of the following is required to protect the potable water supply? Correct Answer reduced pressure principle backflow prevention assembly Internal protection refers to? Correct Answer backflow protection at each point of use Lye is back siphoned from and open vat, without a cover over the top, by a direct cross-connection. This constitutes a? Correct Answer health hazard In responding to a suspected backflow incident, the water purveyor should? Correct Answer implement emergency response plan The loading of the first and second check valves in reduced pressure principle backflow prevention assemblies are always? Correct Answer different undersized water service and distribution piping carrying water at high velocity? Correct Answer may cause backsiphonage due to aspirator effect a perfect vacuum(at sea level) will raise water in a pipe a maximum of? Correct Answer 33.9 ft

the water supplier may require more frequent field testing of backflow prevention assemblies due to? Correct Answer high incidence of field test failures of the assembly which testcock is the arrow pointing to? Correct Answer testcock 2 a differential pressure gage is used to field test? Correct Answer reduced pressure principle backflow assemblies the relief valve opening point of a reduced pressure principle backflow prevention assembly must open at or above Correct Answer 2.0 psid when field testing a reduced pressure principle backflow prevention assembly, the number two testcock should be flushed? Correct Answer with caution to prevent premature opening of relief valve during a field test, the air inlet valve on a pressure vacuum breaker must open at or? Correct Answer above 1 psid Hose Bibb Vacuum Breakers should be located? Correct Answer on hose bibbs as required by code the probable cause of an intermittent discharge of the relief valve on a reduced pressure principle backflow prevention assembly is? Correct Answer fluctuation in supply line pressure When entering a vault containing a backflow prevention assembly, the tester should? Correct Answer check quality of the atmosphere prior to entry a service or containment protection backflow prevention assembly is meant to protect? Correct Answer public water supply system

a vacuum breaker is used to protect against? Correct Answer backsiphonage A tester is required backflow prevention field test information to the? Correct Answer administrative authority(s) Backflow prevention assemblies should be repaired? Correct Answer when field test results indicate failure Check valves of double check valve backflow prevention assemblies must be? Correct Answer internally loaded A vacuum relief valve should be installed? Correct Answer never as a backflow prevention assembly When repairing double check valve assemblies, the tester should not? Correct Answer Modify internal components A backflow prevention assembly should make an abnormal humming noise during operation under which of the following conditions? Correct Answer never The accuracy of field test gages should be checked? Correct Answer at least annually Which part is the arrow pointing to? Correct Answer relief valve diaphragm The air gap drain funnel for the relief valve of a reduced pressure backflow prevention assembly? Correct Answer may not be sufficient to handle the full relief valve discharge How many testcocks are there on a pressure vacuum breaker? Correct Answer two

An atmospheric vacuum breaker must be installed? Correct Answer 6 inches above highest outlet and all downstream piping A double check valve assembly is field tested with a? Correct Answer differential gage the type(s) of backflow are? Correct Answer backpressure and backsiphonage conditions A water main break will most likely cause what condition? Correct Answer backsiphonage A reduced pressure principle backflow prevention assembly shall be installed? Correct Answer readily accessible above grade Which component of a pressure vacuum breaker must be field tested first? Correct Answer air inlet valve Each of the check valves in a double check valve assembly is designed to hold in the direction of flow a minimum static pressure of? Correct Answer 1.0 psi An absolute pressure of 25 PSIA ( at sea level) is equal to approximately what valve in gage pressure (psig) Correct Answer 10 psig Results of a field test on a backflow prevention assembly should not include which of the following information on the report from? Correct Answer date of manufacture To properly field test a reduced pressure principle backflow prevention assembly Correct Answer the inlet shutoff valve must be open

A pressure vacuum breaker may he used for backflow protection for which of the following Correct Answer backsiphonage, health hazards The relief valve of reduced pressure principle backflow prevention assembly discharges in a static, no-flow condition; and stops discharging during a flow condition. The most likely cause is? Correct Answer fouled check valve No. A two inch atmospheric vacuum breaker, when used on irrigation systems, shall be installed at least _________ inches above the downstream piping outlets? Correct Answer six When field testing a double check valve assembly and check valve No.1 leaks, the tester? Correct Answer may test check valve No.2 before repairing check valve No. Which part is the arrow pointing to? Correct Answer relief valve disk A backflow prevention assembly consisting of two independently operating, internally loaded check valves located between two tightly closing shutoff valves, with four appropriately located testcocks is a? Correct Answer double check valve assembly A reduced pressure principle backflow prevention assembly must be installed at least? Correct Answer 12 inches above grade Edible syrup in a cannery was forced into a drinking water line through a direct cross-connection. This could have been prevented be installation of a? Correct Answer double check valve assembly To properly solve a cross connection contamination incident, a qualified person should?

a. Identify and isolate the source of contamination b. Identify and isolate the affected area c. Notify customers and the health department and take water samples d. All above Correct Answer all above To convert fer of head to pounds per square inch, multiply by? Correct Answer 0. The physical operation of a hose bibb vacuum breaker is classified as a type of? Correct Answer atmospheric vacuum breaker A contaminated auxiliary water supply is utilized to maintain high pressure on a fire sprinkler system. To protect the portable water supply what protection should be installed at the service connection? Correct Answer reduced pressure principle backflow prevention assembly The arrow is pointing to which part? Correct Answer check valve No.1 spring when restoring service to customer, after testing a double check valve assembly, the shutoff valves are opened? Correct Answer slowly, No.1 shutoff valve first It is possible to compensate for a leak number 2 shutoff valve during the field test of a reduced pressure principle backflow prevention assembly by attaching a temporary bypass hose from? Correct Answer #1 testcock to #4 testcock When field testing a pressure vacuum breaker near a ceiling, the gage should? Correct Answer be placed at the same elevation as the assembly

Which of the following could create a 'closed water system" if installed in the service supply line? Correct Answer backflow prevention assembly A total cross connection control program should be coordinated with? a. Plumbing inspector b. Local health department c. Water purveyor d. All above Correct Answer all above The temperature increases in a closed plumbing system. This is an example of? Correct Answer thermal expansion The maximum head loss across a double check valve from zero to rated flow is? Correct Answer 10.0 psi Which of the following conditions would not be a hazard to the public water supply? Correct Answer a reduced pressure principle backflow prevention assembly, installed on a cooling tower feed line that is tested twice a year During the held test of a leaking check valve No.2 on a reduced pressure principle backflow prevention assembly, pressure is by- passed through the gage from testcock #2 to testcock #4. This procedure will? Correct Answer cause the differential pressure reading to drop and cause the relief valve to open During the field test of the check valve in a pressure vacuum breaker, the "high bleed" needle valve is left opened. This procedure will? Correct Answer reduce the pressure between the check valve and the No.1 shutoff valve

When field testing a double check valve assembly, check valve No.1 is found to be leaking. The next step is to? Correct Answer test check valve No. The differential pressure gages used for field testing backflow prevention assemblies, read in minimum increments of? Correct Answer 0.1 psid After the installation of a reduced pressure principle backflow prevention assembly, the No.1 shut-off valve is turned on to establish water pressure within the assembly. Upon opening the No.1 shut-off valve, the relief valve discharges continuously. This discharge may be an indication of? Correct Answer a fouled check valve No. The spring in the relief valve of a reduced pressure principle backflow prevention assembly is designed to? Correct Answer open the relief valve In this drawing of a double check valve assembly, the arrow is pointing to what part? Correct Answer check valve No.2 spring In this drawing of a double check valve assembly, the arrow is pointing to what part? Correct Answer testcock # During the test of the check valve on a pressure vacuum breaker, water continues to flow from the open testcock #2. This is an indication of? Correct Answer leaking No.1 shutoff valve Any pressure less than that exerted by the atmosphere is defined as a (an)? Correct Answer vacuum Performance design specifications of reduced principle backflow prevention assemblies require that the differential pressure across

check valve No.1 be __________ psid greater than the opening point of the relief valve? Correct Answer 3. How many testcocks are required on a reduced pressure principle backflow prevention assembly? Correct Answer four The relief valve of a reduced pressure principle backflow prevention assembly discharges continuously during both flow and no-flow conditions. The most probable cause is? Correct Answer fouled relief valve The arrow is pointing to what part on this drawing of a pressure vacuum breaker? Correct Answer testcock # To exert a pressure of one (1) psi at the base of a column of water, the column would have to be? Correct Answer 27. inches high The arrow is pointing to what part on this drawing of a pressure vacuum breaker? Correct Answer the air inlet valve At sea level an absolute vacuum can lift a column of water a maximum of? Correct Answer 33.9 feet Pressure gradient is defined as? Correct Answer the direction and rate of change of pressure over time Static pressure is defined as? Correct Answer Water pressure in any system under non=flowing conditions When a perfect vacuum at sea level draws water into a 40 foot vertical pipe, the pressure in the pipe above the water surface is? Correct Answer zero psia

A pressure of 60 psi in a pipe will raise water? Correct Answer 138 feet Atmospheric pressure is defined as? Correct Answer the weight of air pushing down on the earth's surface A height of 12 inches of water in a tube generates a pressure of 0.433 psi at the bottom. How high would you have to raise the water level in a tube to create a pressure of 1.0 psi? Correct Answer 2.30 feet Identify the primary factor which contributes to the reversal of flow of water in pipe lines? Correct Answer backsiphonage Water pressure of 75 psi will raise water how high in a pipe? Correct Answer 173 feet The average weight of a cubic foot of water at sea level is? Correct Answer 62.4 pounds While field testing the second check valve of an RP, the high side pressure is applied through the No.4 testcock, and the gauge reading drops to the relief valve opening point. How do you proceed? Correct Answer Bleed water through the low side of the gauge While field testing the first check valve of a double check valve assembly, water continues to flow from the sight tube. How do you proceed? Correct Answer observe the reading on the gauge While testing the second check valve of a double check valve assembly, water continues to flow from the sight tube, you open the bleedoff valve and a small amount of water comes out of the bleedoff valve the stops. The gauge reading drops to zero, and water continues to flow from the sight tube. How would you obtain

the proper reading for the second valve check? Correct Answer record the observed reading before the bleedoff valve was opened While field testing the first check valve of a double check valve assembly, water continues to flow from the sight tube. How do you proceed? Correct Answer observe the reading on the guage When a pressure vacuum breaker does not have a critical level marking, what part of the assembly shall be used as the critical level? Correct Answer the bottom The maximum length of time of continuous line pressure allowed on an atmospheric vacuum breaker within a 24 hour period shall not exceed? Correct Answer 12 hours While field testing the second check valve of a double check valve assembly, the water level at the No.4 testcock recedes. What does this imply? Correct Answer shutoff valve No.2 leaks A city distribution main for portable water has a pressure of 100 psi coming out of the pumping station. Immediately out of the pumping station a pipeline carries the water up a 50 foot hill to a water users house. The maximum pressure at the point of delivery would be approximately? Correct Answer 78 psi While field testing a reduced pressure principal backflow prevention assembly, with the No.2 shutoff valve closed, the differential pressure relief valve continuously discharges. This could indicate? Correct Answer leak through the relief valve diaphragm While field testing the No.1 check valve of a double check valve assembly, the No.1 check valve reading is 0.5 psi. How do you proceed? Correct Answer test the No.2 check valve

A domestic water tank on the roof of a 12 story building would require what type of backflow protection? Correct Answer a double check valve assembly While field testing the air inlet valve of a pressure vacuum breaker, the high side bleed valve is opened 1/4 turn and the gauge reading will not drop. How do you proceed? Correct Answer open the No.1 testcock, and reopen the high side bleed valve While testing the check valve of a pressure vacuum breaker, water continues to flow from the No.2 testcock. How do you proceed? Correct Answer open the bleed off valve until flow slows to a slight drip The term "Air Gap Separation" (AG) means? Correct Answer a physical break between the water supply and receiving vessel A proper Air Gap (AG) requires the minimum height of a water supply line above the overflow rim of a receptacle to be? Correct Answer 1 inch An Atmospheric Vacuum Breaker (AVB) air inlet valve will function as designed when installed six inches? Correct Answer above the highest piping with no valves downstream The Spill Resistant Vacuum Breaker (SVB) has one testcock loacted? Correct Answer between the No.1 shutoff valve and the check valve A water closet flushometer valve shall be equipped with an approved vacuum breaker installed on the discharge side of the valve with the critical level at least? Correct Answer 6 inches above the floor

The Uniform Plumbing Code requires an Air Gap (AG) on a 2 inch pipe, 4 inches from side wall and 2 inches from back wall to be? Correct Answer 8 inches above the receiving vessel An Atmospheric Vacuum Breaker (AVB) is? Correct Answer installed downstream of the flushometer valve Pressure Vacuum Breaker (PVB) must be installed? Correct Answer twelve (12) inches above all downstream piping and outlets A Pressure Vacuum Breaker (PVB) maximum designed head loss shall not exceed? Correct Answer 10 psi While field testing the check valve of a pressure vacuum breaker (PVB) for tightness in the direction of flow, if water continues to flow out of test cock No.2 this indicates a? Correct Answer Leaking No.1 shutoff valve Where would the bleed off valve arrangement be installed when field testing the air inlet opening of a pressure vacuum breaker (PVB)? Correct Answer testcock No. A pressure vacuum breaker (PVB), rated for cold water usage shall have a temperature designation of? Correct Answer less than 110 degrees fahrenheit Atmospheric Vacuum Breaker (AVB) is one of the most common backflow prevention assemblies seen in the field, but should never be used? Correct Answer where back pressure may occur When the air inlet valve of a Spill Resistant Pressure Vacuum Breaker (SVB) opens during field test procedures, the tester

must? Correct Answer Record the gauge reading when the air inlet valve opens While field testing the check valve of a pressure vacuum breaker (PVB), water continues to flow from testcock No.2. How do you proceed? Correct Answer open bleed off valve until there is a slight drip from testcock No. While field testing the air inlet valve of a pressure vacuum breaker (PVB), the high bleed valve is opened 1/4 turn and the gauge reading will not drop. How do you proceed? Correct Answer open testcock No. The proper time to raise the test gauge to the height of spill resistant pressure vacuum breaker (SVB) critical level is? Correct Answer Prior to closing No.1 shutoff valve Wile field testing a pressure vacuum breaker (PVB), what would be acceptable reading for an annual test? Correct Answer Check valve held at 1.5 psid, relief valve opened at 1.9 psid When the air inlet valve of a spill resistant pressure vacuum breaker (SVB) opens during field test procedures, the tester must? Correct Answer record the gauge reading as the air inlet opens When testing the check valve of an spill resistant pressure vacuum breaker (SVB), the gauge reading drops to 0.0 psid indicating which of the following? Correct Answer failure of the check valve The term reduced pressure principal assembly (RP) applies to? Correct Answer an assembly of two independently operating check valves with a differential pressure relief valve between the

check valves and below the first check valve, with two resilient seated shut off valves and four resilient seated testcocks The static differential pressure across the first check valve of a Reduced Pressure Principal Assembly (RP), by design, must be greater than the relief valve opening point by? Correct Answer 3 psi The basic operating theory of a Reduced Pressure Assembly (RP) is? Correct Answer The first check valve has a higher loading valve than the second check The relief valve on a reduce pressure assembly shall be located? Correct Answer Where the relief valve seat and the discharge port are below the first check In accordance with standard installation purposes, the maximum principle prayed for a reduced pressure principal assembly is? Correct Answer 36 inches Cerritos pressure principal detector assembly does what? Correct Answer Provide backflow protection as well as detection of unauthorized water use To field test the differential pressure relief valve of reduce pressure assembly with the high side holes of the pressure differential gauge connected to the testcock No. 2 and the low side hole is connected to the testcock No.3 the tester must? Correct Answer Open for the high side control needle valve and the low side control valve A reduced pressure assembly (RP) is continuously discharging from the relief valve. A tester should Correct Answer conduct the test to determine the cause of the relief valve discharge

A new reduced pressure assembly has been installed and the initial test shows a relief valve opening pressure of 2.6 psid and a first check valve drop of 4.6 psid. What is most likely the cause of this condition? Correct Answer a slightly fouled first check valve In field testing a reduced pressure assembly (RP)? Correct Answer the apparent pressure drop across the first check must be observed first During the test of a Reduced pressure Assembly (RP), the differential gauge reading can not be lowered enough to get the relief valve to open, even after opening the gauge needle valve 1/4 turn. This implies that? Correct Answer No.2 shut off valve is leaking When field testing a reduced pressure assembly (RP), the high side hose is connected to testcock No.2 and the low side hose is connected to testcock No.3 with the No.2 shutoff valve closed, the first reading reduced is? Correct Answer the relief valve opening point A reduced pressure assembly (RP) discharging small amounts of water intermittently is most likely cause by? Correct Answer fluctuating upstream pressure after determining the apparent first check valve differential of an RP, what is the next step? Correct Answer determine the opening point of the differential pressure relief valve the buffer between the differential pressure relief valve opening point and the actual first check pressure differential should be at least? Correct Answer 3.0 psi