Backflow prevention assembly tester practice exam.pd, Exams of Assembly Language Programming

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1|Page BACKFLOW PREVENTION ASSEMBLY TESTER PRACTICE EXAM|| ACTUAL EXAM ALL QUESTIONS AND CORRECT ANSWERS ALREADY GRADED A+|| LATEST AND COMPLETE VERSION 2024 WITH VERIFIED SOLUTIONS]|| ASSURED PASS!!! The relief valve of a Reduced Pressure Principle Assmbly remains closed during normal operation due to (A) Supply side pressure (B) The relief valve spring (C) Zone pressure (D) All the above - ANSWER: The relief valve spring What would cause a continual flow of water from of water the air inlet of a PVB prior strting the field test (A) #2 shut off leaking by with baclpressure (B) Fouled ckeck valve (C) #1 shull off leaking by (D) Fouled air inlet - ANSWER: Fouled air inlet A PVB can be installed in the following conditions (A) Backpressure (B) Backsiphonage 2|Page (C) B and D (D) Pollutants and Contaminants - ANSWER: B Backsiphonage and D Pollutants and Contaminants When testing the check valve ob a SVB the water will not stop flowing What is the most probabie cause (A) #2 shut off valve leaks by (B) #1 shut off valve leaks by (C) check valve is fouled (D) None of the above - ANSWER: #1 shut off valve leaks by Which of the following could cause a closed system if installed in the sevice line (A) Hose bibb (B) Backflow Prevention Assembly (C) venturi (D) T & P valve - ANSWER: Backflow Prevention Assembly The critical level when testing the SVB is (A) At the air inlet (B) At the #1 shutoff valve (C) At the vent screw (D) there is on critical level - ANSWER: At the vent screw 4|Page (A)1 (B)2 (C)3 (D) 4- ANSWER: 4 What is the primary consideration when deciding whether ro install a DC or a RP (A) Available space (B) Cost (C) Degree of hazard (D) Available of a floor drain - ANSWER: Degree of hazard A perfect vacuum at sea level will raise the water level in the pipe maximum of (A) 14.7 feet (B) 2.31 feet (C) 33.9 feet () 23.1 feel - ANSWER: 33.9 feet An undersized water supply line carrying water at a high velocity (A) Creates high pressure (B) Creates no problem at all (C) May cause backsiphonage due to the aspirator effect 5|Page (D) May cause backpressure - ANSWER: May cause backsiphonage due to the aspirator effect A PVB may be used for backflow protection for the following conditions (A) Backpressure non-health hazard (B) Backpressure health hazard (C) Backsiphonage health hazard (D) All the above - ANSWER: All the above The safe Drinking water act of 1974 as amended in 1986 authorizes who to set national health based standards for drinking water (A) TCEQ (B) US EPA (C) Water Purveyor (D) Congress - ANSWER: US EPA Ater closing the #2 shit off while testing a RP the relief valve dumps What is the most probable cause (A) #1 check is fouled (B) #2 check is fouled (C) Reilef valve is fouled open (D) #2 check is fouled - ANSWER: #1 check is fouled 7|Page (B) Provide the necessary resultd for test (C) Have no effect because the needle valve is used to bleed air only (D) Increase the differential pressure - ANSWER: Reduce the pressure bet ween the check valve and the #1 shut off valve The spring in the relief valve of a RP is designed to (A) Close the relief valve (B) Assist the supply suide pressure (C) Open the relief valve (D) Increase the differential pressur across the #1 check valve - ANSWER: Open the relief valve The two types of cross connections are (A) Direct and Indirect (B) Static and Dynamic (C) Temporary amd Permanent (D) Direct and Pressurized - ANSWER: Direct and Indirect How many test cocks are on PVB (A)4 (B)2 © (D) 3 - ANSWER: 2 8| Page The maximum distance that a absolute vacuum at sea level can lift a column of water is (A) 2.31 (B) 4.6 (©) 14.7 (D) 33.9 - ANSWER: 33.9 An unprotected bypass around a RP is (A) Allowed when the device needs repair (B) Allowed when service cannot be interupted (C) Not allowed (D) Allowed for servicing hospitals only - ANSWER: Not allowed When fleid testing the RP what would be observed if the #2 check was fouled (A) NO differential and no discharge from the relief valve (B) NO differential and discharge from the relief valve (C) Differential pressure and no discharge from the relief valve (D) Differential pressure and discharge from the relief valve - ANSWER: Differential pressure and discharge from the relief valve What device is used to compensate for a leaking shut off valve when testing a DC assy 10|Page (D) A ciapper type - ANSWER: Internally loaded In responding to a backflow incident the water purveyor should (A) Call the mayor (B) Implement the emergency response plan (C) Install a vacuum breaker (D) Develop a good excuse - ANSWER: Implement the emergency response plan A mixture of air and gas is considered hazardous when the mixture exceeds what percentage of gthe lower explosive limit (A) 0% (B) 3% (C)7™% (D) 10% - ANSWER: 10% To exert a pressure of 1.0 psi at base of a water column the column would have to be (A) 4.34 high (B) 14.7 high (C) 27.75 high (D) 33.89 high - ANSWER: 27.75 high A DC must be tested 11|Page (A) Upon installation (B) Every 6 month (C) Annually on a health hazard (D) none of the above - ANSWER: Upon installation An absolute perssure of 25 psiaa (at sea level) is equal to approximately (A) 5 psi (B) 10 psi (C) 20 psi (D) 25 psi - ANSWER: 10 psi Dueing a field test the air inlet on PVB must open at (A) Above 2.0 psid (B) Below 1.0 psid (C) Above 1.0 psid (D) Below 2.0 psid - ANSWER: Above 1.0 psid A differential pressuer gauge is used to field test (A) PVB's (B) Dual Checks (C) AVB's 13|Page (A) Greter than or equal to 5.0 psid (B) 3.0 psid greater than the relief valve opening point (C) 1.0 psid in the directiom of flow (D) Less than 5.0 psid - ANSWER: Greter than or equal to 5.0 psid When testing a SVB what is the firsrt test being performed (A) The air inlet opening point (B) The static pressure across the check valve (C) To verify the #2shut off hold tight (D) To check if the SVB hold water - ANSWER: The static pressure across the check valve When testing a PVB the air inlet opens upon closing the #1 shut off valve What is the most probable cause (A) Leaking #2 shut off valve (B) Leaking #1 shut off valve (C) Fouied air inlert (D) Fouied check valve - ANSWER: Leaking #2 shut off valve A 2" AVB when used on irrigation systemsterm-15 shall be instilled (A) 6" above all downstream piping (B) 18" above all downstream piping 14|Page (C) 24" above all downstream piping (D) 27 3/4" above all downstream piping - ANSWER: 6" above all downstream piping What causes the relief valief valve to close on a RPZ? (A) Reilef valve spring pressure (B) Supply side water pressure (C) Pressure differential between Check #1 and Check #2 (D) All the above - ANSWER: Supply side water pressure When testing a RP instialled in vauil the relief valve opening point falls to zero What is most probabie cause (A) The relief valve is stuck shut (B) #1 check is fouled (C) the #2 shut off leaks by (D) Installed improperly - ANSWER: Installed improperly When field testing the DC the #1 check static differential pressure is found to be 0.0 psid What is the most probable cause (A) Fouied #2 Check (B) Leaking #2 shut off (C) Fouled #1 check (D) Leaking #1 shut off - ANSWER: Fouled #1 check 16|Page (B) Fouied #2 check (C) Fouied relief valve (D) Line pressure fiuctuation - ANSWER: Fouied relief valve A PVB may be installed with (A) A pump downstream (B) A water heater downstream (C) A shutoff valve downstream (D) An eievated storage tank downstream - ANSWER: A shutoff valve downstream A confined space is defined as a space with which of the following characteristics (A) Limited openings for entry and exit (B) Cramped work area (C) Varied lighting (D) Poor access - ANSWER: Limited openings for entry and exit A reduced pressure principle assembly is not required at service connection of this facility (A) Car wash (B) Sewage Treatment Plant (C) Plating Plant (D) A singie family dwelling - ANSWER: A singie family dwelling 17|Page when entering a confined space to test a backflow assmembly the tester should (A) Send in the hriper flrst (B) Have permission from the watrer purveyor (C) Check the quality of the atmosphere befoe entering (D) None of the above - ANSWER: Check the quality of the atmosphere befoe entering When testing the first check of a DC the site tube goes empty what is the most probable cause (A) Leaking #1 shiut off valve (B) Leaking #2 shiut off valve (C) Leaking #2 check (D) B and C - ANSWER: Leaking #2 shiut off valve and Leaking #2 check While testing check valve #2 of a RP under backpressure what would be observed if the second if the second check valve was fouled (A) NO differential and no discharge from the relief valve (B) NO differential and discharge from the relief valve (C) Differential pressure and no discharge from the relief valve (D) Differential pressure and discharge from the relief valve - ANSWER: Differential pressure and discharge from the relief valve Backflow Preventer assy test reports are required to be kept on file 19|Page (B) The same (C) Different (D) Maxumun 2 pisd different - ANSWER: Different A total cross connectiom program should be coordinated with (A) Plumbling Insprctor (B) Local Health Dept (C) Water Purveyor (D) All the Above - ANSWER: All the Above Whan testing a DC water continuues to flow the #4 tesrt cock after the use of bleed off assy the most probale cause (A) Fouled #2 check (B) Fouled #1 check (C) Leaking #1 shut off valve (D) Leaking #2 shut off valve - ANSWER: Leaking #2 shut off valve When protected by a atmospheric vacuum breaker a 2" inlet shall be installed at least above the floor level rim of the tank (A) 2" (B) 4" (Cc) 6" (D) 12" - ANSWER: 6" 20|Page To properly field test a RP (A) The #1 shut off valve must be left open (B) The #2 shut off valve must be open position (C) Both shut off valve are in the open position (D) Both shut off valve are in the closed position - ANSWER: The #1 shut off valve must be left open When a relief valve of a RP has intermittent discharge the most probabie is (A) #1 shut off valve leaks by (B) Relief valve is stuckl closed (C) #2 shut off is open (D) Supply line pressuer fluctuations - ANSWER: Supply line pressuer fluctuations The safe drinking water act of 1974 as amended in 1986 places the primary responsibility for water quality of the publie water supply on which of the following (A) Customer (B) Water Purveyor (C) Contractor (D) Backflow Tester - ANSWER: Water Purveyor