Download Backflow Prevention Principles and Practices and more Exams Engineering in PDF only on Docsity!
BACKFLOW PREVENTION ASSEMBLY BPAT
TESTER FINAL EXAM LATEST ACTUAL
EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
Pressure vacuum breaker shut-off valves must be _____ valves. A. Angle B. Gate C. Globe D. Regulating E. Tightly closed Correct Answer E. 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 Correct Answer C. 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 Correct Answer A. 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 Correct Answer C. 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 Correct Answer C. 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 Correct Answer C. 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 Correct Answer C. Double check valve assembly Double check detector assembly flow indicators must register flow up to _____?
C. Record the water supply line pressure D. Submit the test report to the water supply E. Test check valve number 2 with backpressure Correct Answer A. 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 Correct Answer B. 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 Correct Answer D. 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 Correct Answer A. 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 Correct Answer B. 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 Correct Answer E. 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 Correct Answer B. 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 Correct Answer D. Relief valve discharge A reduced pressure principle assembly's buffer can be described as a ____? A. Soft-seated check upstream of the assembly
E. 5 psid (34.5 kPa) Correct Answer A. 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 Correct Answer C. 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 Correct Answer A. 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 Correct Answer B. 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 Correct Answer A. 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 Correct Answer E. 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) Correct Answer B. 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 Correct Answer B. 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 Correct Answer B. Inspected annually When close to two intersecting walls, an air-gap separation is increased from 2 diameters to _____ diameters. A. 2. B. 3
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 Correct Answer B. 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 Correct Answer D. 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 Correct Answer B. 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 Correct Answer D. 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 Correct Answer C. 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) Correct Answer A. 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 Correct Answer B. Gauge pressure decreases An indirect cross-connection suggests the system may be subject to ____? A. An air gap separation B. Backpressure C. Backsiphonage only D. A meniscus E. A Venturi Correct Answer C. Backsiphonage only A reduced pressure principle assembly's continuous discharge from a relief valve and a gauge reading of 4 psid to 5 psid may indicate _____? A. A damaged check 1 guiding member B. Debris fouling check valve number 1 C. A leaking shut-off valve number 2
C. Relief valve D. Shut-off valve E. Test cock Correct Answer D. 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 Correct Answer A. 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 Correct Answer B. 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 Correct Answer E. Reduced pressure principle assembly 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 Correct Answer E. 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 Correct Answer B. 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 Correct Answer E. 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 Correct Answer A. 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
D. 12 in (30 cm) E. 18 in. (46 cm) Correct Answer D. 12 in (30 cm) Modifications of any kind to a backflow preventer will _____? A. Alter its head loss B. Render it inoperable C. Require a tester failure D. Validate its warranty E. Void its approval Correct Answer E. Void its approval A water system pressure of 10 psi (69 kPa) and a plumbing system pressure of 20 psi (138 kPa) may be described as _____? A. Backpressure B. Backsiphonage C. Gauge pressure differential D. inflow/infiltration E. Static condition Correct Answer A. Backpressure According to ANSI standard, potable water pipe marking requirements are _____ lettering. A. Blue background with white B. Green background with white C. Green background with yellow D. White background with blue E. White background with green Correct Answer B. Green background with white A water closet ball cock must be installed above the opening of the overflow pipe by at least _____? A. 1.0 in. (2.5 cm) B. 1.5 in. (3.8 cm) C. 2.0 in. (5.1 cm) D. 2.5 in. (6.4 cm) E. 3.0 in. (7.6 cm) Correct Answer A. 1.0 in. (2.5 cm)
Gauges used for field tests of backflow preventers must have the calibration checked ____? A. After every 50 tests B. Annually C. If dropped D. If used in temperature extremes E. With water Correct Answer B. Annually New backflow prevention assemblies should be tested ____? A. Before failure B. Before the expiration of the warranty C. Before being placed into the system D. In the presence of a plumbing inspector E. Monthly Correct Answer B. Before the expiration of the warranty A common backflow preventer on a double-wall heat exchanger with leak detection is ____? A. An air-gap separation B. An atmospheric vacuum breaker C. A double check valve assembly D. A reduced pressure principle assembly E. Nothing Correct Answer E. Nothing A recommended containment backflow preventer for a restricted or classified facility is a _____? A. Dual check valve B. Dual check with an intermediate vent C. Double check valve assembly D. Pressure vacuum breaker E. Reduced pressure principle assembly Correct Answer E. Reduced pressure principle assembly Plumbing codes require that water system pressures do not exceed ____?
A. Keep the high and low manifold valves open B. Maintain the gauge and hose connections at the same height as the assembly C. Open the high-pressure bleed valve before opening a test cock D. Open the low-pressure and bypass control valves E. Plug the bypass and low-pressure hose end connections Correct Answer B. Maintain the gauge and hose connections at the same height as the assembly When testing a backflow preventer, shut-off valve 2 is closed before shut-off valve 1 because _____? A. Failures in outlet valves are determined first B. It slows the rate of flow through the assembly C. The potential of backflow during the test is eliminated D. Venturi flow through the check will cavitate the assembly E. Water pressure will be maintained for testing Correct Answer E. Water pressure will be maintained for testing Plumbing codes define hot water as above _____? A. 100 degrees F (38 degrees C) B. 110 degrees F (43 degrees C) C. 140 degrees F (60 degrees C) D. 180 degrees F (82 degrees C) E. 210 degrees F (99 degrees C) Correct Answer B. 110 degrees F (43 degrees C) Before the physical test of a backflow preventer may begin, the tester must first _____? A. Begin completing the test report form B. Conduct a downstream plumbing hazard inspection C. Obtain a repair kit D. Obtain permission to shut-down the water service E. Provide notice to the fire department Correct Answer D. Obtain permission to shut-down the water service
If pressure vacuum breaker air-inlet valve does not open and the gauge indicator does not drop, a reason may be _____? A. A leaking shut-off valve 2 with a parallel installation B. A tightly closing shut-off valve number 1 C. The check valve is failed D. The high-pressure bleed valve is open E. The test cock is open Correct Answer A. A leaking shut-off valve 2 with a parallel installation A backflow preventer creates a closed plumbing system that requires the installation of a(n) _____? A. Expansion tank B. Globe valve C. Pressure reducing valve D. Temperature and pressure relief valve E. Utility box key Correct Answer A. Expansion tank When both shut-off valves are closed on a reduced pressure principle assembly and test cock 2 is opened, a tester should expect _____? A. Check valve number 1 to open B. Continuous flow from the test cock C. No flow from the test cock D. No result E. Relief valve discharge Correct Answer E. Relief valve discharge The force needed to close a check valve in a dual check is _____? 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) Correct Answer A. 1 psid (6.9 kPa)
