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Backflow Prevention Practice Exam Actual
Questions and Answers 2024- 2025
Containing a plumbing system from the public water supply requires backflow protection at the _______? A. Appliance or fixture B. Building foundation C. Irrigation system D. Service Connection E. Sprinkler riser Ans - Service Connection Backflow preventer manufacturers recommend that assemblies be field-tested annually and when_____? A. Installed B. Moved C. Repaired or Installed D. Shut down E. Water suppliers provide notice Ans - Repaired or Installed A differential pressure gauge reading of 0.2 psid is represented on water column sight tube by _____? A. 1/16 in. (0.16 cm) B. 1/2 in. (1.3 cm) C. 2 in. (5.1 cm) D. 3.5 in. (8.9 cm) E. 5.5 in. (14 cm) Ans - 5.5 in. (14 cm) Pollution of a public water supply suggests the substance in the water is ____?
A. Aesthetically bad B. Biological with virus only C. Lowering the pH below 1. D. Radiological E. Toxic Ans - Aesthetically bad Backsiphonage may occur when the pressure inside copper tubing is ____? A. Greater than atmospheric pressure B. Greater than barometric pressure C. Greater than 0 gauge pressure D. Less than absolute pressure E. Less than atmospheric pressure Ans - Less than atmospheric pressure A cross-connection may be a permanent piping arrangement or a(n) ____? A. Backflow preventer B. Church symbol C. OSHA hazardous area designation D. Railroad and highway intersection sign E. Temporary hose bibb connection Ans - Temporary hose bibb connection The isolation of a plumbing water system hazard requires____? A. Appliance protection B. Building quarantine C. High-hazard protection D. Meter protection E. Toxin monitoring Ans - Appliance protection A direct cross-connection suggests the piping system may be subjected to ____?
A. Commercial irrigation systems B. Fire-suppression systems C. Plumbing fixtures or appliances D. Utility storage tanks E. Water service connections Ans - Plumbing fixtures or appliances The mechanical component of an atmospheric vacuum breaker serves as an air-inlet valve and a ____? A. Check valve B. Regulating valve C. Relief valve D. Shut-off valve E. Test port Ans - Check valve A deck-mounted atmospheric vacuum breaker's critical installation level is above the outlet usage by ___? A. 1 in. (2.5 cm) B. 3 in. (7.6 cm) C. 6 in. (15 cm) D. 12 in. (30 cm) E. 18 in. (46 cm) Ans - 1 in. (2.5 cm) A hose-bibb connection is required to have a permanently installed ____? A. Atmospheric vacuum breaker B. Backflow preventer C. Pressure vacuum breaker D. Shut-off valve E. Spill-resistant vacuum breaker Ans - Atmospheric vacuum breaker Atmospheric vacuum breakers must not be subject to continuous water pressure for more than ___ hr.
A. 3
B. 6
C. 12
D. 18
E. 24 Ans - 12 A submerged atmospheric vacuum breaker may be considered a(n) _____? A. Backflow preventer B. Cross-connection C. Expensive elbow D. Typical installation E. Useful training photo Ans -. Cross-connection Flow from the outlet of an atmospheric vacuum breaker must not reach a _____? A. Closed tank B. Section of straight tubing C. Submerged inlet D. Toxic substance E. Valve Ans - Valve An atmospheric vacuum breaker is not required to have a(n) _____? A. Annual field test B. Installation elevation C. Installation inspection D. Label E. Usage limitaion Ans - Annual field test The air-inlet valve of an atmospheric vacuum breaker is help closed by____?
A pressure vacuum breaker may have ____ on the assembly's discharge piping. A. Auxiliary water supply looped irrigation B. A boiler C. A booster pump D. Elevated piping E. Irrigation sprinkler heads Ans - Irrigation sprinkler heads The minimum loading to open a pressure vacuum breaker's air-inlet valve is ____? A. 1 psi (6.89 kPa) B. 2 psi (13.8 kPa) C. 3 psi (20.7 kPa) D. 4 psi (27.6 kPa) E. 5psi (34.5 kPa) Ans - 1 psi (6.89 kPa) The recorded value of a pressure vacuum breaker check valve is determined when ____? A. Both shut-off valves are closed B. The high-bleed valve is opened C. The air-inlet valve opens D. Water stops flowing from test cock 1 E. Water stops flowing from test cock 2 Ans - Water stops flowing from test cock 2 Pressure vacuum breaker shut-off valves must be _____ valves. A. Angle B. Gate C. Globe D. Regulating E. Tightly closed Ans - Tightly closed
An indication that a pressure vacuum breaker is undersized for its application is _____? A. Air-inlet valve leakage B. Bonnet distortion C. Chatter or noise during flow D. Disc pitting E. Spring elongation Ans - Chatter or noise during flow Continuous flow from a pressure vacuum breaker's test cock 2 with shut-off valve 2 open and shut-off valve 1 closed is an indication of _____? A. Backpressure backflow B. Backsiphonage backflow C. A failed air-inlet valve D. A leaking check valve E. A leaking or damaged shut-off valve 1 Ans - Backpressure backflow Pressure vacuum breakers may be used on the following applications except ____? A. High hazard/backsiphonage B. High hazard/continuous pressure C. Low hazard/backpressure D. Low hazard/backsiphonage E. Low hazard/intermittent pressure Ans - Low hazard/backpressure A double check valve assembly is installed 12 in. (30.5 cm) above the floor for _____? A. Electrical code compliance B. Floor draining C. Maintenance D. Mechanical code compliance E. Rodent control Ans - Maintenance
Double check valve assembly components must be _____? A. Bronze B. Independently acting C. Plastic D. Rubber E. Spring activated Ans - Independently acting After the repair of a double check valve assembly, a field test is required for the _____? A. Check valve number 1 B. Component repaired C. Entire assembly D. Tester's personal records only E. Shut-off valve tightness Ans - Entire assembly Prior to testing the check valves in the direction of flow on a double check valve assembly using a high and low side on the gauge, a tester must first ____? A. Determine the tightness of shut-off valve number 2 B. Notify the owner of the water shut-off C. Record the water supply line pressure D. Submit the test report to the water supply E. Test check valve number 2 with backpressure Ans - Determine the tightness of shut-off valve number 2 A double check valve assembly installed in a vertical flow down orientation is only allowed ______? A. In a basement or vault B. If the assembly was tested and approved as such C. If the check weight does not compress the spring D. On fire-suppression systems E. On water supply service connections Ans - If the assembly was tested and approved as such
A check valve field test reported value of 0.8 psid (5.5 kPa) suggests _____? A. A passing check valve B. A broken or failed spring C. Debris in the check seat D. Disc softening or decay E. Low water pressure Ans - Disc softening or decay A reduced pressure principle assembly's relief valve is loaded to _____? A. Push the valve away from its seat B. Push the valve on to its seat C. Remain closed with any zone pressure D. Remain open with any supply pressure E. Sustain all water hammer conditions Ans - Push the valve away from its seat The purpose of the reduced pressure principle assembly check valve number 1 loading is to _____? A. Create a pressure head increase B. Create a reduction in water pressure C. Provide water pressure to the relief valve diaphragm D. Reduce system pressure to the plumbing code limit E. Sustain the assembly's buffer Ans - Create a reduction in water pressure Intermittent relief valve discharge from a reduced pressure principle assembly is probably caused by _____? A. A fouled check valve number 1 B. A fouled check valve number 2 C. A fouled relief valve D. A partially closed shut-off valve number 2 E. Water hammer or hydraulic shock Ans - Water hammer or hydraulic shock
E. Piped with the flow directed down Ans - Lower than check valve number 1 The maximum protection provided by a reduced pressure principle assembly is ____? A. High hazard/backpressure B. High hazard/backsiphonage C. High hazard/backpressure or backsiphonage D. Low hazard/backpressure E. Low hazard/backpressure or backsiphonage Ans - High hazard/backpressure or backsiphonage The reduced pressure principle assembly's number 2 check valve is loaded to close the valve with a minimum differential pressure of _____? A. 1 psid (6.9 kPa) B. 2 psid (13.9 kPa) C. 3 psid (20.7 kPa) D. 4 psid (27.6 kPa) E. 5 psid (34.5 kPa) Ans - 1 psid (6.9 kPa) If a reduced pressure principle assembly's field test shows a leaking shut-off valve 2, the leak may be compensated by obtaining water pressure/flow from ____? A. A high-pressure gauge control valve B. A low-pressure gauge control valve C. Test cock number 1 D. Test cock number 2 E. Test cock number 3 Ans - Test cock number 1 An air-gap separation will tend to _____? A. Admit air into the system to break a siphon B. Allow air to backpressure instead of liquid C. Dissipate chlorine residual
D. Generate a whistle to warn of a siphon E. Provide code compliance Ans - Admit air into the system to break a siphon Technically, the air-gap separation dimension is determined from the ____? A. Discharge pipe's outer diameter B. Effective opening C. Fixture inlet diameter D. Supply pipe diameter E. Service connection size Ans - Effective opening When a piping discharge is near a wall, the air-gap separation must be increased an additional ____ pipe diameter(s). A. 1 B. 2 C. 3 D. 4 E. 5 Ans - 1 An air-gap separation's hazard classification is _____? A. High hazard/backsiphonage B. High hazard/backpressure C. Low hazard/backsiphonage D. Low hazard/backpressure E. High or low hazard/backsiphonage only Ans - High or low hazard/backsiphonage only With the exception of a drinking fountain, the minimum air-gap separation is _____? A. 0.5 in. (1.3 cm) B. 1.0 in. (2.5 cm) C. 1.5 in. (3.8 cm)
D. Sanitary sewer E. Water meter Ans - Sanitary sewer Toxins may enter a water supply pipe air-gap separation through the ____? A. Atmosphere B. Control valve C. Pressure tank D. Receiving vessel E. Sanitary sewer Ans - Atmosphere A properly installed barometric loop will prevent _____? A. Backpressure B. Backsiphonage C. Freezing D. Leakage E. Surges Ans - Backsiphonage A swing connection is a type of _____? A. Backflow preventer B. Cross-connection C. Detector assembly D. Gauge component E. Shut-off valve repair tool Ans - Cross-connection A barometric loop must be installed 35 ft (10.7 m) above the highest ____? A. Boiler B. Fixture outlet C. Gate valve
D. Service connection E. Water meter Ans - Fixture outlet A spool is used to connect a ____? A. Copper and ductile iron pipe B. Copper and PVC pipe C. Disc retainer and valve guide D. Potable and non-potable system E. Test cock Ans - Potable and non-potable system A fire sprinkler system's backflow protection for a black-iron pipe system is typically ____? A. An air-gap separation B. A double check valve assembly C. A reduced pressure principle assembly D. A reduced pressure detector assembly E. No protection required Ans - A double check valve assembly The dual check with an intermediate vent is used primarily for ____? A. Commercial boilers B. Industrial process water piping C. Hose bibbs D. Low-pressure residential boilers E. Swimming pool chlorinators Ans - Low-pressure residential boilers A hose connection vacuum breaker's maintenance includes _____? A. Check disc replacement B. Diaphragm replacement C. Draining for winterization
D. Leakage through the diaphragm E. A weak or broken spring Ans - Debris fouling check valve number 1 If a reduced pressure principle assembly's relief valve opens at a differential pressure of 5.5 psid, the reason may be a(n) _____? A. Brushing or stem is worn B. Damaged check valve seat C. Dirty or damaged relief valve seat or disc D. Outlet shut-off valve is leaking with backpressure E. Misaligned or broken relief valve spring Ans - Dirty or damaged relief valve seat or disc Confined space air monitors will sound if the oxygen percentage is less than _____%. A. 18. B. 18. C. 19. D. 19. E. 20.0 Ans - 19. An irrigation sprinkler with chemical injection will require a(n) _____? A. Air-gap separation B. Atmospheric vacuum breaker C. Double check valve assembly D. Pressure vacuum breaker assembly E. Reduced pressure principle assembly Ans - Reduced pressure principle assembly While obtaining a reduced pressure principle assembly's relief valve opening point using a high and low- pressure hose, turning the gauge valve more than 1/4 turn indicates a leaking _____? A. Check valve B. Gauge Valve
C. Relief valve D. Shut-off valve E. Test cock Ans - Shut-off valve A reduced pressure principle assembly check valve number 1 is field-tested _____? A. In the direction of flow only B. Under backpressure C. Under backsiphonage D. Under backpressure and the direction of flow E. Under backpressure and backsiphonage Ans - In the direction of flow only A thrust block is designed to ____? A. Adjust pressure changes B. Maintain pipe joint integrity C. Stop backflow D. Stop water hammer E. Support failing soil conditions Ans - Maintain pipe joint integrity Water hauling truck fill stations should have either an air-gap separation or a(n) _____? A. Atmospheric vacuum breaker B. Double check valve assembly C. Dual check valve D. Pressure vacuum breaker assembly E. Reduced pressure principle assembly Ans - Reduced pressure principle assembly When testing a reduced pressure principle assembly using three hoses, a difference between the apparent and actual reading is likely due to _____? A. Backflow B. Check valve failure
