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Backflow Prevention Practice Exam/ Q&A/ A+
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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 - Answer: 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 - Answer: 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 - Answer: 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 - Answer: 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 - Answer: Death To prevent backflow, an atmospheric vacuum breaker is primarily designed to ____? A. Allow air into the outlet piping system
D. 12 in. (30 cm) E. 18 in. (46 cm) - Answer: 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 - Answer: 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 - Answer: 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 - Answer:. 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 - Answer: 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 - Answer: 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 - Answer: 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
D. Elevated piping E. Irrigation sprinkler heads - Answer: 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) - Answer: 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 - Answer: 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 - Answer: 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 - Answer: 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 - Answer: 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 - Answer: Low hazard/backpressure
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) - Answer: 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) - Answer: Serial number Double check valve assembly components must be _____? A. Bronze B. Independently acting C. Plastic D. Rubber E. Spring activated - Answer: 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 - Answer: 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 - Answer: 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 - Answer: 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
E. Water hammer or hydraulic shock - Answer: Water hammer or hydraulic shock Backpressure to a reduced pressure principle assembly fouled check valve number 2 will likely _____? A. Dissipate through the air-vent B. Force the relief valve to open and discharge C. Have no visible effect D. Push the check valve closed E. Remain in the system - Answer: Force the relief valve to open and discharge An air-gap separation must be maintained at a reduced pressure principle assembly's _____? A. Build drain B. Domestic Supply C. Indirect drain outlet D. Relief valve discharge E. Stationary sensor - Answer: Relief valve discharge A reduced pressure principle assembly's buffer can be described as a ____? A. Soft-seated check upstream of the assembly B. Difference between the values for check valve 1 and check valve 2 C. Difference between the check valve 1 loading and the relief valve opening point D. Difference between the relief valve opening point and check valve 2 E. Sum of the check valve 1 loading and the relief valve divided by 2 - Answer: Difference between the check valve 1 loading and the relief valve opening point
When a reduced pressure principle assembly is installed vertically, the relief valve discharge must be _____? A. To a floor drain 2 times the piping size B. Higher than check valve number 1 C. Lower than check valve number 1 D. Lower than check valve number 2 E. Piped with the flow directed down - Answer: 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 - Answer: 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) - Answer: 1 psid (6.9 kPa)
A. 1
B. 2
C. 3
D. 4
E. 5 - Answer: 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 - Answer: 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. 2.0 in. (5.1 cm) E. 3.0 in. (7.6 cm) - Answer: 1.0 in. (2.5 cm) Water discharged through an air gap to an open tank surface has a pressure of ____? A. 0 psi absolute
B. 0 psi atmospheric C. 0 psi gauge D. Static line pressure E. Vapor pressure - Answer: 0 psi atmospheric Air-gap separations must be ____? A. Classified B. Inspected annually C. Laboratory listed D. Tested and repaired E. Tested with a sight tube - Answer: Inspected annually When close to two intersecting walls, an air-gap separation is increased from 2 diameters to _____ diameters. A. 2. B. 3 C. 3. D. 4 E. 4.5 - Answer: 4 An air-gap separation is mandatory between the potable supply and a(n) _____? A. Bakery dough mixer B. Isolation assembly C. Pressure washer D. Sanitary sewer
B. Fixture outlet C. Gate valve D. Service connection E. Water meter - Answer: 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 - Answer: 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 - Answer: 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 - Answer: Low-pressure residential boilers A hose connection vacuum breaker's maintenance includes _____? A. Check disc replacement B. Diaphragm replacement C. Draining for winterization D. Replacement every 2 years E. Water flushing - Answer: Draining for winterization Pressure loss per foot of elevation rise is ____? A. 0.43 psi (2.99 kPa) B. 0.50 psi (3.45 kPa) C. 1.0 psi (6.89 kPa) D. 2.0 psi (13.9 kPa) E. 2.3 psi (15.9 kPa) - Answer: 0.43 psi (2.99 kPa) When the water velocity increases, the ____? A. Atomospheric pressure decreases B. Gauge pressure decreases C. Gauge pressure increases D. Head loss does not change E. Water temperature lowers - Answer: Gauge pressure decreases An indirect cross-connection suggests the system may be subject to ____? A. An air gap separation
