Back Flow Practice Test Questions With Complete Solution Graded A+

BACKFLOW TEST 1. The Safe Drinking Act places the responsibility for safe water upon the: a. Building Official b. Water purveyor c. Water user d. Health Department - ANS b. Water Purveyor 2. Two things must be present for backflow to occur: a. Link and force b. Direct and indirect c. Pressure and Siphonage d. Backpressure and elevation - ANS a. link and force A column of water 100 feet in height will produce how much pressure at its base. a. 231 psi b. 33.9 psi c. 43.3 psi d. 2.31 psi - ANS c. 43.3 psi Atmospheric pressure at sea level is: a. 33.9 psi b. 14.7 psi C. 43.3 psi d. 433 psi - ANS d. 433 psi The maximum height that a perfect vacuum will lift water at sea level is: a. 35 feet b. 38 feet c. 33.9 feet d. 43.3 feet - ANS c. 33.9 feet A column of water one (1) foot high will produce a pressure of: a. 433 psi b. 33.9 psi c. 2.31 psi d. 100 psi - ANS a. 433 psi Which of the following hydraulic conditions will create backflow? a. Venturi effect b. Backsiphonage c. Backpressure d. All of the above - ANS d. all of the above A reduced pressure in the supply line can cause backsiphonage by creating a a. Vacuum b. Venturi c. Backpressure d. Thermal expansion - ANS a. Vacuum A high hazard is something which if introduced into the water system may cause: a. No problems b. Illness c. Death d. both B and C - ANS d. both b and c The PVB is tested with a gauge a. Differential b. Duplex c. Pressure d. PSIG gauge - ANS a. Differential The 1997 edition of the "Uniform Plumbing Code requires that carbonators shall be protected by a listed a. PVB b. DCVA c. RPZ d. AVB - ANS c. RPZ The three types of cross-connection hazard are: a. Chemical b. Physical c. Biological d. High e. Low f. A, B and C - ANS f. A, B and C Premises isolation is the practice of installing backflow assemblies at a. The Hazard b. The meter c. Inside the office d. Inside the equipment room - ANS b. The meter Which of the following is not a biological hazard a. Flu b. Hepatitis A c. Campylobacterious d. Giardia - ANS a. flu Thermal expansion in a closed system is a a. Acceptable condition b. Expansion of the pipe itself due to heat c. Safety problem d. Necessary condition - ANS b. expansion of the pipe itself due to heat and c. safety problem Examples of Chemical hazards would include a. Antifreeze b. Boiler Treatment chemicals c. Algaecides d. All of the above - ANS d. all the above Proper protection for a boiler with chemical injection would be a. No protection required b. AVB c. Dual Check d. RPZ - ANS d. RPZ An approved method of backflow prevention is a. Trap Primer b. There is no such thing c. Air Gap d. Air break - ANS c. air gap The definition of flood rim level is a. The point on a vacuum breaker that determines correct installation. b. The highest level that liquid will rise before overflow will occur. c. There is no such thing d. The 100 year flood plain - ANS b. the highest level that liquid will rise before overflow will occur A DCVA is designed to provide protection against a. Backpressure b. Elevation C. Backsiphonage d. Both A and C - ANS d. both A and C An AVB must be installed a minimum of above the highest downstream outlet. a. Six inches b. Eighteen inches c. Twelve inches d. Twenty four inches - ANS a. six inches An AVB may not be pressurized for more than hours in a 24 hour period a. Six B. Twelve c. One d. Eight - ANS b. twelve When Testing a Double Check Detector Assembly, the tester must a. Test the water meter. b. Not turn the water off c. Flow water through the meter d. Test both the mainline and the bypass assemblies - ANS d. test both the mainline and the bypass assemblies TCEQ requires that all high hazard assemblies must be tested annually - ANS T All approved assemblies must be designed to be tested and repaired in line - ANS T It is not necessary to match assemblies to the degree of hazard - ANS F A low hazard may be protected with a DCVA - ANS T In Texas, copies of the field test forms must be sent to TCEQ - ANS F An AVB may not be installed with downstream shut-off valves - ANS T Vertical installation of any RPZ is approve by the TCEQ - ANS F According to TCEQ a General Tester may not test fire line assemblies - ANS T Absolute pressure is gauge pressure plus atmospheric pressure - ANS T When requiring backflow prevention assemblies to be installed, it is important to require only approved assemblies - ANS T Most corrosion inhibitors and related chemicals are non-toxic - ANS F Assemblies must be sized to provide an adequate supply of water - ANS T The type of backflow assembly for a given situation must be based upon the degree of hazard and hydraulic condition present - ANS T Pressure vacuum breakers must be installed at least six inches above the highest downstream outlet - ANS F A hazard created by an in-line booster pump is the lowering of pressure created by the inlet or suction side of the pump - ANS T The Plumbing Industry in Texas is regulated by what agency a. Texas State Board of Plumbing Examiners (TSBPE) b. American Water Works Association (AWWA) c. Texas Commission on Environmental Quality (TEQ) d. Environmental Protection Agency (EPA) - ANS a. Texas State Board of Plumbing Examiners (TSBPE) The degree of hazard for a wastewater treatment plant would be a. Low b. None c. High d. Medium - ANS c. high The degree of hazard for a dairy would be a. Low b. None C. High d. Medium - ANS c. high The degree of hazard for a chemical plant would be a. Low b. None c. High d. Medium - ANS c. high The degree of hazard for a hospital would be a. Low b. None c. High d. Medium - ANS c. high Proper protection for a hospital would be a. DCVA b. Dual Check c.Air Gap d. RPZ e. Either C or D - ANS e. either C or D An RPZ may not be installed in an area where it may be exposed to a. Flooding b. Toxic Fumes c. Corrosive fumes d. All of the Above - ANS d. all of the above The first test of an RPZ determines the condition of the a. Number one check b. Number two check C. Relief Valve d. Air inlet - ANS c. relief valve The last test of an RPZ determines the condition of the a. Number one check b. Number two check c. Relief valve d. Air inlet - ANS a. number one check The minimum spring tension on the relief valve of a RPZ is a. Six pounds b. Two pounds c. Five pounds d. One pound - ANS b. two pounds A confirmed space has which of the following characteristics. a. Is large enough to enter b. Not designed for employee occupancy c. A,B and D d. Has limited means of entry and exit - ANS c. A,B and D The Maximum permissible level of oxygen in a confined space is a. 19.5 % b. 20.5 % c. 23.5 % d. 22 % - ANS c. 23.5% Which of the following conditions would cause a confined space to become permit required a. A toxic atmosphere b. An explosive atmosphere c. Gasoline fumes d. All of the Above - ANS d. all of the above Field Test report (for assemblies) forms must be kept on file for a. Ten years b. Five vears c. Three years d. Always - ANS c. three years Who is responsible for completing and distribution of test report forms a. The State b. The water purveyor c. The tester d. The plumbing contractor - ANS c. the tester The TEQ recognizes two types of testers, what are they a. Plumbers b. Fire line c. General d. Both B and C - ANS d. both b and c To become a backflow assembly tester a person must a. Successfully complete a TEQ approved 40 hr class b. Be a Plumber c. Be an Irrigator d. Be EPA approved - ANS a. successfully complete a TEQ approved 40 hr class An Approved Pressure Vacuum breaker assemble must have a. An independently operating loaded air inlet valve located on the discharge side of the check valve. b. Two properly located resilient seated test cocks c. Two tightly closing resilient seated shutoff valves one attached at each end of the assembly. d. All of the above - ANS d. all of the above An Approved Spill Resistant Pressure Vacuum Breaker must have a. An independently operating internally loaded check valve b. An independently operating loaded air inlet valve located on the discharge side of the check valve. c. One properly located resilient seated test cock d. A properly located bleed/vent port, e. Two tightly closing resilient seated shutoff valves one attached at each end of the assembly. f. All of the above - ANS f. all of the above Each USC 10th Ed Backflow Field Test for each assembly begins with NIlO, which means a. Numbers, Incident, Issue, Overture b. No one, Inside, Indicated, or Observed c. Notify, Identify, Inspect, Observe d. None of the above - ANS c. notify, identify, inspect, observe The term "Contaminate" is reference to a. Non health hazard b. Aesthetically un-pleasant substance c. Health Hazard d. Will not cause illness - ANS c. health hazard The term "pollutant" is reference to a. Non health hazard b. Aesthetically un-pleasant substance c. Health Hazard d. Will not cause illness e. A, B and D - ANS e. A, B and D For a backflow incident to occur what condition(s) must be met a. There must be a cross-connection b. A hazard must exist to which the potable water is connected c. A hydraulic condition must occur d. All of the above - ANS d. all of the above An Air Gap is reinspected by means of a. A differential gauge b. A mercury gauge c. A visual inspection/physically moving finger through gab d. A Pressure Gauge - ANS c. a visual inspection/physically moving finger through gab If a backflow device is found installed that is no longer on the approved assembly list, a. Grandfathered - due to already installed b. Acceptable -due to grandfather clause c. Not acceptable--no grandfather clause in backflow-needs replaced d. Should be ignored -its not a problem - ANS c. Not acceptable--no grandfather clause in backflow-needs replaced The acceptable amount of lead be considered lead free is a. Water-.015 % (Maximum Contaminate Level) b. Solider--.2 % c. Copper fittings and pipe-20% d. Both A and B - ANS d. Both A and B When checking assemblies with, (with a differential gauge), check valves (RP, DC, SVB, PVB) the minimum psi to pass the test, each check valve must be a. 5 psi b. 10 psi c. 1 psi d. 3 psi - ANS c. 1 psi A approved Reduced Pressure Principle Assembly must have a. Two independently acting approved check valves b. Together with a hydraulically operating, mechanically independent pressure differential relief valve located between the check valves and at the same time below the first check valve. c. Four properly located resilient seated test cocks d. Two tightly closing resilient seated shutoff valves one at each end of the assembly. e. All of the Above - ANS e. all of the above An Approved Double Check Assembly must have a. Two independently acting, approved check valves b. Two tightly closing resilient seated shutoff valves one attached to each end of the assembly c. Four properly located resilient seated test cocks. e. All of the above - ANS e. all of the above The number 1 cross connection is a. Boilers b. Water heaters c. Hose bibb d. Water trucks - ANS c. hose bibb The minimum heigh for a "Barometric Loop" is a. 10 ft b. 20 ft C. 34 ft d. 100 ft - ANS c. 34 ft A "Continuous Pressure" is considered when an assembly is under press for a. 24 hours a dav b. Less than 12 hours c. 12 hours or more d. Is never shut off - ANS c. 12 hours or more A dairy is considered High hazard due to a. Lactose intolerance b. Manure c. Both B and D d. Chemicals used around dairy - ANS c. both B and D A CSI inspection form must be kept on file for a. Three years b. Five vears c. 10 years d. Not required to be kept - ANS c. 10 years A Bleed valve is also know as a a. Check valve b Test Cock c. Compensator d. Differential gauge - ANS c. compensator Although backflow assembly testing report forms can come from a certain city, the form ultimately must be approved for use by a. BPat tester b. TCEQ c. Federal Government d. Goggle search - ANS b. TCEQ Atmospheric vacuum breakers and pressure vacuum breakers protect against backsiphonage only - ANS T A DCVA which is installed in a below grade pit or vault must have the test cocks plugged - ANS T A low hazard and pollution mean the same thing - ANS T A building which has a wel on site for irigation does not pose a cross connection hazard - ANS F An AVB has two test cocks and two shut-offvalves - ANS F The RPZ may be installed in an area where it may be exposed to toxic fumes - ANS F The most common cause of death in confined spaces is due to lack of oxygen - ANS T An Underground pit or vault must be at least five feet deep to be considered as a confined space - ANS F An approved RZ provides high or low hazard protection and protects against backpressure and backsiphonage. - ANS T Test report forms must be obtained from TEQ - ANS F The PVB consists of a spring loaded air inlet, a spring loaded check valve, two test cocks and inlet and outlet shut-off valves - ANS T The Safe Drinking Water Act is a Federal Law - ANS T The Air Gap does not require reinspection - ANS F A properly installed air gap provides protection against high or low hazard and both backpressure and backsiphonage - ANS T An Approved assembly must have a serial number marked on the body of the assembly - ANS T The AVB has how many test cocks a. One b. Two c. None d. Four - ANS c. none The DCVA has how many test cocks a. One b. Two c. Three d. Four - ANS d. four The number three test cock on a DCVA is located a. Between the two checks b. Between the number two check and the number two valve c. Between the number one valve and the number one check d. On the inlet side of the number one shut-off valve - ANS a. between the two checks The proper level of backflow prevention depends on a. The degree of hazard present b. The type of hazard present c. The hydraulic conditions present d. All of the Above - ANS d. all of the above Who can install assemblies in Texas a. Irrigators b. Plumbers c. Fire sprinkler contractors d. All of the above - ANS d. all of the above The formula for an air gap is a. 2 X ID of the outlet, never less than one inch b. One inch c. There is no formula d. An air gap is not approved for backflow prevention - ANS a. 2 X ID of the outlet, never leas than one inch The Dual Check is a. An approved Assembly b. Testable with a differential gauge c. backflow device d. Acceptable for high hazard - ANS c. backflow device A Double Check detector assembly is approved for a. High hazard Fire system b. Any fire system c. Low hazard fire system d. Is not approved - ANS c. low hazard fire system The minimum spring tension on the number one and two checks of a RPZ are a. Two pounds b. Different c. The Same d. One pound - ANS b. different The first test performed on an AVB measures the a. Tightness of the check valve b. Opening point of the relief valve c. Opening of the air inlet valve d. The AVB is not test able - ANS d. The AVB is not test able The TEQ requires that gauges used in the testing of backflow assemblies a. Must be tested (calibrated) every two years b. Must be tested (calibrated) annually c. Must be tested (calibrated) every six months d. Must never be tested (calibrated) - ANS b. Must be tested (calibrated) annually Backflow gauges are considered to be accurate if they are within a. Plus or minus .2 b. One tenth c. Plus or minus 2.0 d. Plus or minus 10.0 - ANS a. plus it minus .2 The pressure differential gauge may be used to test which of the following a. RPZ b. Dual check c. PVB d. DCVA e. A, C and D - ANS e. A, C and D Point of use protection is the application of backflow prevention at a. The meter b. The property line C. The cross connection/source d. The front door - ANS c. the cross connection/ source When testing a RPZ a gauge reading of 0 when testing the relief valve indicates a. A Failing of relief valve b. A failing gauge c. A passing relief valve d. A failing of number two check - ANS a. a failing of relief valve The AVB is tested with what type of gauge a. Duplex b. The AVB cannot be gauge tested c. differential d. Sight tube - ANS b. the AVB cannot be gauge tested When testing a DCVA with a differential gauge a FAILING check is indicated by a gauge reading of a. Two psi b. One psi c. Six psi d. Less than one psi - ANS d. less than one psi When testing a DCVA with a leaking #1 shut-off valve a will be needed a. Duplex gauge b. Sight tube c. Bleeder valve/compensator d. Jumper hose - ANS c. bleeder valve/ compensator The springs on the number one and two check valves on a DCVA both have a minimum tension of a. Two pounds b. Five pounds C. One pound d. Ten pounds - ANS c. one pound The maximum allowable pressure drop across an approved DCVA is a. 14 psi b. 10 pis c. 24 psi d. 14.7 psi - ANS b. 10 pis Which of the following is not an approval agency a. USC b. UPC c. EPA d. IAPMO - ANS d. IAMPO The minimum acceptable level of protection for a fire system with antifreeze is a. DCVA b. Air Gap c. RPZ d. PVB - ANS c. RPZ The correct level of protection for a lawn irrigation with chemical injection is a. DCVA b. Dual Check c. RPZ d. No protection required - ANS c. RPZ