Backflow Prevention Practice Exam Questions and Answers

Backflow Prevention Practice Exam Questions and Answers 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 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 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) 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 1.4 D. Radiological E. Toxic 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 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 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 Appliance protection A direct cross-connection suggests the piping system may be subjected to ____? A. Backpressure or backsiphonage B. Backsiphonage only C. Periodic inspection D. Sustained pressure E. Toxic materials Backpressure or backsiphonage A pipe restriction's flow velocity increase may allow ____? A. Aspiration B. Backpressure C. Low turbulence D. Pressure head E. Pressure surges Aspiration Water supply contamination from backflow may result in ____? A. A bad taste B. Coloration C. Death D. Odor or smell E. Pipe wall mineral deposit flaking Death To prevent backflow, an atmospheric vacuum breaker is primarily designed to ____? A. Allow air into the outlet piping system B. Create an elevation loop above ground C. Introduce head loss D. Prevent backpressure E. Restrict velocity Allow air into the outlet piping system Atmospheric vacuum breakers will typically be located on ____? A. Commercial irrigation systems B. Fire-suppression systems C. Plumbing fixtures or appliances D. Utility storage tanks E. Water service connections 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 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) 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 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 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 . 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 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 Annual field test The air-inlet valve of an atmospheric vacuum breaker is help closed by____? A. Atmospheric pressure B. Cotter pins C. Gravity D. Spring tension E. Water pressure Water pressure Pressure vacuum breaker shut-off valves and test cocks will avoid freeze damage if winterized by ____? A. Leaving all valves fully open B. Rotating ball valve handles to 45 degree angle C. Purging the body with compressed air D. Removing the assembly's internal components E. Removing shut-off valve and test cock operators Rotating ball valve handles to a 45 degree angle A supply pressure loss with a functional check valve will cause a pressure vacuum breaker to ____? A. Admit air into the downstream piping B. Be subject to backpressure C. Discharge water D. Fail E. Retain water pressure downstream of the check valve Retain water pressure downstream of the check valve If not marked, a pressure vacuum breaker's critical level is ____? A. At the bottom of the valve body B. Measured from the check valve inlet C. Measured from the body outlet D. Not important E. The air-inlet valve opening At the bottom of the valve body 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 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) 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 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 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 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 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 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 Maintenance Double check valve assembly product performance standards require venting for _____? A. Chemicals B. Test cock corrosion C. Trapped air D. Vertical installations E. Winterization Trapped air A low-hazard use only backflow preventer is 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 Double check valve assembly Double check detector assembly flow indicators must register flow up to _____? A. 1 gpm (3.8 l/min) B. 2 gpm (7.6 l/min) C. 3 gpm (11.4 l/min) D. 4 gpm (15.1 l/min) E. 5 gpm (18.9 l/min) 2 gpm (7.6 l/min) A field test report for a double check valve assembly will include the manufacturer's name, model, size, and _____? A. Body material B. Date of manufacture C. Serial number D. Working pressure (maximum) E. Working temperature (maximum) Serial number Double check valve assembly components must be _____? A. Bronze B. Independently acting C. Plastic D. Rubber E. Spring activated 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 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 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 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 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 Push the valve away from its seat