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BACKFLOW PREVENTION ASSEMBLY TESTER PRACTICE EXAM, Exams of Water and Wastewater Engineering

Virginia State University (VSU)Water and Wastewater Engineering

BACKFLOW PREVENTION ASSEMBLY TESTER PRACTICE EXAM

Typology: Exams

2024/2025

Available from 04/04/2025

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BACKFLOW PREVENTION ASSEMBLY TESTER PRACTICE
EXAM
1. 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: Implement the emergency response plan
2. A mixture of air and gas is considered hazardous when the mixture
exceeds what percentage of the lower explosive limit
(A) 0%
(B) 3%
(C) 7%
(D) 10%: 10%
3. 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: 27.75 high
4. A DC must be tested
(A) Upon installation
(B) Every 6 month
(C) Annually on a health hazard
(D) none of the above: Upon installation
5. 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: 10 psi
6. Dueing a field test the air inlet on PVB must open at
(A) Above 2.0 psid
(B) Below 1.0 psid
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16

Partial preview of the text

Download BACKFLOW PREVENTION ASSEMBLY TESTER PRACTICE EXAM and more Exams Water and Wastewater Engineering in PDF only on Docsity!

BACKFLOW PREVENTION ASSEMBLY TESTER PRACTICE

EXAM

  1. 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: Implement the emergency response plan
  2. A mixture of air and gas is considered hazardous when the mixture exceeds what percentage of the lower explosive limit (A) 0% (B) 3% (C) 7% (D) 10%: 10%
  3. 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: 27.75 high
  4. A DC must be tested (A) Upon installation (B) Every 6 month (C) Annually on a health hazard (D) none of the above: Upon installation
  5. 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: 10 psi
  6. 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: Above 1.0 psid

  1. 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) Fouled air inlet (D) Fouled check valve: Leaking #2 shut off valve
  2. A 2" AVB when used on irrigation systemsterm-15 shall be instilled (A) 6" above all downstream piping (B) 18" above all downstream piping (C) 24" above all downstream piping (D) 27 3/4" above all downstream piping: 6" above all downstream piping
  3. What causes the relief value valve to close on a RPZ? (A) Relief valve spring pressure (B) Supply side water pressure (C) Pressure differential between Check #1 and Check # (D) All the above: Supply side water pressure
  4. When testing a RP instilled in avail the relief valve opening point falls to zero What is most probable cause (A) The relief valve is stuck shut (B) #1 check is fouled (C) the #2 shut off leaks by (D) Installed improperly: Installed improperly
  5. 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: Fouled #1 check
  6. The critical level for checking the air inlet of the PVB is (A) At the air inlet (B) At #1 shut off (C) At #1 test cock (D) At #2 shut off: At the air inlet
  1. The physical operation of a Hose Bibb Vacuum Breaker is classified as a type of (A) Dual check valve (B) Atmospheric vacuum breaker (C) Pressure vacuum breaker (D) Double check backflow preventer: Atmospheric vacuum breaker
  2. An oxygen deficient atmosphere has less than what percentage of oxygen (A) 19.50% (B) 10% (C) 21% (D) 24%: 19.
  3. The relief valve of a RP discharges in flow and non-flow condition What is the most probable cause (A) Fouied #1 check (B) Fouied #2 check (C) Fouied relief valve (D) Line pressure fluctuation: Fouied relief valve
  4. A PVB may be installed with (A) A pump downstream (B) A water heater downstream (C) A shutoff valve downstream (D) An elevated storage tank downstream: A shutoff valve downstream
  5. The relief valve of a Reduced Pressure Principle Assembly remains closed during normal operation due to (A) Supply side pressure (B) The relief valve spring (C) Zone pressure (D) All the above: The relief valve spring
  6. What would cause a continual flow of water from of water the air inlet of a PVB prior starting the field test (A) #2 shut off leaking by with backpressure (B) Fouled check valve

(A) Atmospheric vacuum breaker (B) Double check valve assembly (C) Pressure vacuum breaker assembly (D) Reduced pressure backflow assembly: Reduced pressure backflow assembly

  1. While testing a backflow device under the influence of direct cross con- nection it is observed that the hazard preset is a pollutant Which assembly is appropriate for protection (A) AVB , PVB , Air Gap (B) RP , DC , SVB (C) Air Gap , RP , DC (D) Barometric Loop: Air Gap , RP , DC
  2. How many test cocks are required on a RP (A) 1 (B) 2 (C) 3 (D) 4: 4
  3. 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: Degree of hazard
  4. 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 (D) 23.1 feel: 33.9 feet
  5. An undersized water supply line carrying water at a high velocity (A) Creates high pressure (B) Creates no problem at all (C) May cause back siphonage due to the aspirator effect (D) May cause backpressure: May cause back siphonage due to the

aspirator effect

  1. During the field test of the check valve of a PVB the high bleed needle valve is left open This will (A) Reduce the pressure bet ween the check valve and the #1 shut off valve (B) Provide the necessary resulted for test (C) Have no effect because the needle valve is used to bleed air only (D) Increase the differential pressure: Reduce the pressure bet ween the check valve and the #1 shut off valve
  2. The spring in the relief valve of a RP is designed to (A) Close the relief valve (B) Assist the supply side pressure (C) Open the relief valve (D) Increase the differential pressure across the #1 check valve: Open the relief valve
  3. The two types of cross connections are (A) Direct and Indirect (B) Static and Dynamic (C) Temporary and Permanent (D) Direct and Pressurized: Direct and Indirect
  4. How many test cocks are on PVB (A) 4 (B) 2 (C) 1 (D) 3: 2
  5. The maximum distance that a absolute vacuum at sea level can lift a column of water is (A) 2. (B) 4. (C) 14. (D) 33.9: 33.
  6. An unprotected bypass around a RP is (A) Allowed when the device needs repair (B) Allowed when service cannot be interrupted

(C) Not allowed (D) Allowed for servicing hospitals only: Not allowed

  1. When flied 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: Differential pres- sure and discharge from the relief valve
  2. What device is used to compensate for a leaking shut off valve when testing a DC assy (A) Stie tube (B) Differential Gauge (C) Bleed off assembly (D) Screw Driver: Bleed off assembly
  3. How many test cocks are on PVB (A) 1 (B) 3 (C) 2 (D) 4: 2
  4. Any pressure less than that exerted by the atmosphere is defined as (A) Slphon (B) Vacuum (C) Backflow (D) Absolute Pressure: Vacuum
  5. Check Valve of double check backflow assy's must be (A) Spring loaded (B) Internally loaded (C) A gravity closing type (D) A clapper type: Internally loaded
  6. A confined space is defined as a space with which of the following char- acteristics (A) Limited openings for entry and exit
  1. When testing the SVB the gauge goes to zero upon closing the #1 shut off valve what is the most probable cause (A) The #2 shut off leak by (B) The check valve is fouled (C) The air inlet does not work (D) #1 shul off valve leak by: The check valve is fouled
  2. How long is the backflow test report required by law to be maintained by the water purveyor (A) 2 months (B) 1 year (C) 3 years (D) 5 years: 3 years
  3. The loading of the first and second check valves in a RP is always (A) Less than 1 psid (B) The same (C) Different (D) Maximum 2 pads different: Different
  4. A total cross connection program should be coordinated with (A) Plumbing Inspector (B) Local Health Dept (C) Water Purveyor (D) All the Above: All the Above
  5. Whan testing a DC water continues to flow the #4 test cock after the use of bleed off assy the most probable cause (A) Fouled #2 check (B) Fouled #1 check (C) Leaking #1 shut off valve (D) Leaking #2 shut off valve: Leaking #2 shut off valve
  6. 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"

(C) 6"

(D) 12": 6"

  1. 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: The #1 shut off valve must be left open
  2. When a relief valve of a RP has intermittent discharge the most probable is (A) #1 shut off valve leaks by (B) Relief valve is stuck closed (C) #2 shut off is open (D) Supply line pressure fluctuations: Supply line pressure fluctuations
  3. The safe drinking water act of 1974 as amended in 1986 places the primary responsibility for water quality of the public water supply on which of the following (A) Customer (B) Water Purveyor (C) Contractor (D) Backflow Tester: Water Purveyor
  4. When testing a RP a differential pressure gauge is used to determine the difference between (A) The water pressure at #1 test cock and #4 test cock (B) The water pressure at #2 test cock and #4 test cock (C) The high side pressure and low side pressure (D) The high side pressure and gauge pressure: The high side pressure and low side pressure
  5. While observing a RP the relief valve spits intermittently from the relief valve what in the probable cause (A) #1 shut off leaking by (B) Fouled relief valve (C) Pressure fluctuations
  1. How many test cocks are on SVB (A) 2 (B) 1 (C) 4 (D) 3: 1
  2. Water continuously leaking from test cock #2 while testing the check valve of a PVB is probably caused by a leaking (A) Air inlet (B) Test cock # (C) Shut off valve # (D) Shut off valve #2: Shut off valve #
  3. When Testing a backflow assembly the first step is (A) Flush test cock (B) Attach test gauge hoses (C) NIIO (D) Close gauge needle valves: NIIO
  4. A link between a potable water supply and a non-potable water supply is a (A) Air Gap (B) Barometric Loop (C) Cross Loop (D) Cross Connection: Cross Connection
  5. The accuracy of field test gauges should be checked (A) After every test (B) Annually (C) Monthly (D) Upon purchase of the gauge: Annually
  6. When field testing a DC the #2 check valve is found to be leaking the next step is to (A) Repair #1 shut off valve (B) Repair #2 check valve (C) Do notining (D) Replace the entire assembly: Repair #2 check valve
  1. An AVB must be installed (A) 6" above the highest outlet all downstream piping (B) 6 times the pipe diameter above the highest point of use (C) 12" above the highest outlet all downstream piping (D) 2.31 feet above point of use: 6" above the highest outlet all downstream piping
  2. A health hazard is commonly referred to as (A) A poison (B) A contaminant (C) A pollutant (D) Lethal: A contaminant
  3. After repairing RP the assembly is restored to proper operation and the relief valve continuously dumps what is the most probable causes (A) Fouled #1 check (B) Leaking #2 shut off (C) Springs installed in the wrong checks (D) A or C: A Fouled #1 check or C Springs installed in the wrong checks
  4. Containment backflow prevention is meant to protect (A) A boiler (B) A irrigation system (C) A public water supply (D) A chill water system: A public water supply
  5. Who has the primary responsibility for preventing water from unapproved from entering the public water supply (A) Consumer (B) Plumber (C) Water Purveyor (D) Health Dept: Water Purveyor
  6. When field testing the RP the test cocks should be flushed in what order (A) Open 1,2,3,4 then close 1,2,3, (B) Open 4,3,2,1 then close 1,2,3, (C) Open 1,2,3,4 then close 4,3,2, (D) They should not be flushed: Open 4,3,2,1 then close 1,2,3,

(D) You can test the #1 check before repairing the #2 check: You can test the #2 check before repairing the #1 check

  1. An atmospheric vacuum breaker may have downstream shut off valve (A) When located 12" above the flood level rim (B) When a relief valve is installed downstream (C) Under no circumstances (D) if the shut off valve closing: Under no circumstances
  2. Which of the following assemblies contains an independently operating internally loaded check valve and independently operating loaded air inlet valve located on the discharge side of the check (A) AVB (B) DC (C) PVB (D) RP: PVB
  3. A major concern of the water purveyor a auxiliary water is utilized is (A) Backflow protection at the water meter (B) The auxilliary water supply is tested (C) The auxiliary water supply is treated (D)The auxilliary water supply pressure is lower the public water supply: Back- flow protection at the water meter
  4. An absolute pressure of 25 psia is equal to approximately what value in gauge pressure ( PSIG ) (A) 5 psig (B) 10 psig (C) 15 psig (D) 25 psig: 10 pisg
  5. What is the primary cause of the reversal of flow of water in a piping system (A) the length of the piping system (B) low flow conditions (C) The reversal of a pump (D) The loss of pressure in a system: The loss of pressure in a system
  6. What type of protection is provided by a Barometric Loop

(A) Backpressure (B) An atmospheric break (C) Backsiphonage (D) Backpressure and Backsiphonage: Backsiphonage

  1. During the field test of a leaking #2 valve on a Rp pressure is bypassed througt the gauge from #2 test cock to the #4 test cok this procedure will (A) Give the actual pressure drop aross #2 check valve (B) Caues the differential pressure reading to drop and the relief to open (C) compensate for a leaking #1 shut off valve (D) Show a inaccurate prssure drop acrss #1 check valve: Caues the differential pressure reading to drop and the relief to open
  2. The physical operation of hose bibb vacuum breaker is classified as a type of (A) AVB (B) RP (C) Dual check with intermediate vent (D) Pressure relief valve: AVB
  3. The relief valve opening point on a RP must be at or above (A) 1.0 psid (B) 2.0 psid (C) 3.0 pisd (D) Greater than 5.0 psid: 2.0 psid
  4. An air gap must have (A) Two times the pipe diameter (B) A 2" separation at flood level rim (C) Two times the fill pipe diameter what a minimum 1" separation (D) A maximum of 1" above the overflow rim: Two times the fill pipe diameter what a minimum 1" separation
  5. When testing the RP the high hose is attached to #2 test cock and low side hose is attached to the #3 test cock the needle on the gauge will indicate (A) No Differential