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WorksheetsBackflow Review Quiz A
Total questions: 100
Worksheet time: 50mins
A contaminant is defined as:
The backflow of any foreign material into a potable water system.
The backflow of waste from a once-through water heater into the potable water system.
The backflow of an edible syrup from a canning factory into the potable water system.
Backflow which constitutes a hazard to public health.
Which of the following is used to properly field test a reduced pressure principle backflow prevention assembly?
Sight glass
Mercury manometer
Differential pressure gauge
Duplex pressure gauge
A reduced pressure principle backflow prevention assembly shall have the direction of flow clearly indicated on the:
Body of the assembly or identification plate.
Shut off valve entering the assembly.
Identification plate.
Inside cover of each check valve.
A differential pressure gauge is used to field test:
AG
DCVA
AVB
Venturi's
A differential pressure gauge is used to field test:
AG
PVB
AVB
Venturi's
A differential pressure gauge is used to field test:
AG
SVB
AVB
Venturi's
A differential pressure gauge is used to field test:
AG
RP
AVB
Venturi's
A double check valve assembly is field tested and one of the checks is found to be failing. The usual cause would be:
Air inlet does not open
Damaged or dirty disc
Plugged relief valve bypass
SOV #2 leak
The maximum length of time of continuous line pressure allowed on an atmospheric vacuum breaker within a 24 hour period shall not exceed:
Twenty four (24) hours
Six (6) hours
Twelve (12) hours
Sixteen (16) hours
When field testing a pressure vacuum breaker and the air inlet fails to open as the gauge drops to 0.0 psid, the problem may be caused by one of the following:
Backpressure against the assembly.
Damaged check valve seat.
Leaky #1 shutoff valve.
Missing air inlet spring.
During the field test of a spill resistant pressure vacuum breaker, a reading of 0.5 psid is obtained for the air inlet valve. The field test report should indicate:
Backflow prevention assembly failed.
Air inlet is working properly.
This data is not entered on the field test report.
Check valve is working properly.
The maximum length of time of continuous line pressure allowed on an atmospheric vacuum breaker within a 24 hour period shall not exceed:
Twenty four hours.
Six hours.
Twelve hours.
Sixteen hours.
The differential pressure gauge is used to field test:
Atmospheric vacuum breaker.
Barometric loops.
Reduced pressure principle backflow prevention assemblies.
Air gaps.
When field testing the check valve of the pressure vacuum breaker, should water continue to flow from testcock #2, the tester should:
Record that the air inlet valve is leaking.
Adjust the bleed valve arrangement to compensate for an air inlet valve leak.
Record that the check valve is leaking.
Adjust the bleed valve arrangement to compensate for a shutoff valve #1 leak.
When field testing the check valve of the pressure vacuum breaker, water continues to flow from the No. 2 testcock. How do you proceed?
Attach bleed off valve to No. 2 testcock
Close testcocks and remove all equipment
Open bleed off valve until flow slows to a drip
Record the reading on the gauge
While field testing the air inlet valve of a pressure vacuum breaker, the high side bleed valve is opened a 1/4 turn and the gauge reading will not drop. What does this imply?
No. 1 shut off valve is leaking
Check valve is leaking
Air inlet is leaking
Air inlet is stuck closed
While field testing the air inlet valve of a pressure vacuum breaker, the high side bleed valve is opened a 1/4 turn and the gauge reading will not drop. After closing the high side bleed valve, how do you proceed?
Bleed off high side of the gauge
Open testcock #1, and re-open high side bleed valve
Close testcock #2, and re-open high side bleed valve
Bleed off low side of the gauge
While field testing the differential pressure relief valve opening point of an RP, the high side control valve is open, and the low side control valve is opened a 1/4 turn, however the reading on the gauge will not lower to the RV opening point. What does this imply?
CV #2 is leaking
SOV #2 is leaking
SOV #1 is leaking
RV is stuck in the closed position
While field testing the differential pressure relief valve opening point of a reduced pressure principle backflow prevention assembly, the high side control needle valve is open, and the low side control needle valve is opened a 1/4 turn, however the reading on the gauge will not lower to the relief valve opening point. What does this imply?
No. 2 check valve is leaking
No. 2 shutoff valve is leaking
No. 1 shutoff valve is leaking
Relief valve is stuck in the closed position
A direct cross-connection permits backflow by:
Backsiphonage only
Backpressure only
The aspirator effect
Both backpressure and backsiphonage
If an atmospheric vacuum breaker is installed correctly, and water discharges from the air inlet during normal use, the most probable cause is:
The first check is leaking
A fouled air inlet valve
The #2 SOV is not holding
The valve is subject to backpressure
An unprotected by-pass around a reduced pressure principle backflow prevention assembly is:
Not permissible on any installation
Permissible when used on fire protection assemblies
Permissible when the assembly is removed for repair
Permissible when water service cannot be interrupted
During the field test of a pressure vacuum breaker which component must be tested first?
Relief valve
Check valve
second check valve
Air inlet valve
A backflow prevention assembly tester is required to report backflow prevention field test information to the:
Manufacturer of the backflow prevention assembly
Administrative authority(s)
American Backflow Prevention Association (ABPA)
American Water Works Association (AWWA)
The accuracy of a differential pressure gauge should be checked:
Never
After every field test
As required by local jurisdiction
Before every field test
During the field test of a pressure vacuum breaker which component must be tested second?
Relief valve
Check valve
second check valve
Air inlet valve
While field testing the No. 1 check valve of a double check valve assembly, the No. 1 check valve reading is 0.5 psi. How do you proceed?
Open testcock #4
Repair SOV #2
Repair CV #1
Test CV #2
When field testing a spill resistant pressure vacuum breaker installed five feet above grade, the gauge shall be placed:
Approximately 27 3/4" below the assembly
At the same elevation as the assembly
On the ground, directly below the assembly
So that the gauges vent hose can reach a drain
The pressure on the downstream side of a properly installed and operating pressure vacuum breaker is lowered from 50 psi to 0.5 psi. This condition:
Will cause the check valve to not work
Means the air inlet is not working
Will cause the air inlet valve to open to atmosphere
Means the #1 Shutoff valve is leaking
An indirect cross-connection permits backflow by:
Backsiphonage only
Backpressure only
The aspirator effect
Both backpressure and backsiphonage
Field test results on a reduced pressure principle backflow prevention assembly are: CV #1 - 5.0 psid CV #2 - Tight RV - 1.6 psid This data would indicate the:
Backflow prevention assembly is working properly
Air inlet is not working properly
Field testing is not completed
Backflow prevention assembly is not working properly
The relief valve on a reduced pressure principle backflow prevention assembly shall be located:
Where the relief valve seat(s) and discharge port(s) are below the first check valve.
On the discharge side of the second check valve and at the same elevation as the check valve seat.
At least three inches below the second check valve.
In a position just above the first check valve, but not higher than the shut off valve.
A double check assembly is field tested and one of the checks is found to be failing. The usual cause would be:
Air inlet does not open
Damaged or dirty disc
No. 2 shutoff valve leaks
Plugged relief valve bypass
While field testing a pressure vacuum breaker, the air inlet valve will not open. This could indicate:
Leaking SOV #2
Air inlet disc is stuck to the seat
Leaking CV #1
CV #2 is leaking
A pressure vacuum breaker may be used for backflow protection for which of the following conditions?
Backpressure of high hazards
Backsiphonage of low hazards
Backpressure of low hazards
When the assembly is mounted below the point of use
The spill resistant pressure vacuum breaker may be installed:
Below grade
Inside a wall with no access
In a pit with a minimum of twelve inches clearance
Where it is accessible for testing, repair and maintenance
A backpressure situation exists when:
Water users system inlet pressure drops below atmospheric
There is a cross-connection
Water rushes through a restriction in the piping
There is higher pressure in the water users system than the supply line
An appropriate type of protection for a submerged inlet to a chemically treated cooling tower would be:
No protection is needed
A dual check
DCVA
RP
While field testing a pressure vacuum breaker, the air inlet valve will not open. This could indicate:
Leaking SOV #2
Leaking SOV #1
Leaking CV #1
CV #2 is leaking
The spring in the differential pressure relief of an RP tends to:
Open the relief valve
Increase the differential pressure across the CV #1
Close the relief valve
Assist the supply pressure
While field testing the air inlet valve of a pressure vacuum breaker, the air inlet valve opens below 1 psid, what is the most likely cause of this situation?
High side bleed valve has been left open
Scale buildup on the air inlet seat
Scale buildup on the check valve seat
Leaking #2 shutoff valve
A pressure vacuum breaker air inlet valve must:
Be made of brass
Have a stainless steel spring
Be mounted six inches above the check valve
Have a minimum one psi loading
While field testing a reduced principle backflow prevention assembly, the No. 2 shutoff valve and bleed valves are closed, the gauge reading drops to the relief valves opening point and begins to discharge. How do you proceed?
Close SOV #1 until the RV discharge can be compensated for
Cannot proceed with the balance of the test
Record SOV #2 is leaking
Open high side bleed valve and re-establish the zone
While field testing a reduced principle backflow prevention assembly, with the No. 2 shutoff valve closed, the differential pressure relief valve continuously discharges. This could indicate:
No. 2 shutoff valve leak
Leak through the relief valve diaphragm
Properly operating assembly
Leaking No. 1 shutoff valve
While field testing the second check valve of a reduced principle backflow prevention assembly, the high side pressure is applied through testcock #4, and the gauge reading drops to the relief valves opening point. What does this imply?
Check valve #1 holds tight
Shutoff valve #2 leaks
Relief valve operates improperly
Check valve #2 leaks
An airgap prevents backflow by:
A physical separation from the water line
Two check valves
Pressure differential
One check valve and an air inlet
When a straw is used to drink from a cup, the principal being demonstrated is:
Positive pressure
Backsiphonage
Pollution
Backpressure
What is the minimum backflow prevention assembly required to protect against a fire protection system with a chemical additive in the fire system?
DCDA
RPBA
DCVA
Single detector check valve
While field testing the second check valve of a double check valve assembly, the water level at #4 testcock recedes. What does this imply?
Check valve #1 holds leaks
Shutoff valve #1 leaks
Check valve #2 holds
Shutoff valve #2 leaks
While field testing the air inlet of a spill resistant pressure vacuum breaker, the high side bleed valve is open 1/4 turn, and the reading on the gauge will not lower to the air inlet opening point. What does this indicate?
SOV #1 is leaking
Check valve is stuck open
Air inlet valve is stuck shut
Shutoff valve #2 leaks
What laboratory evaluation test is not performed on a double check valve assembly during the approval / listing process?
Pressure loss test
Relief valve discharge capacity test
Check valve opening point test
Hydrostatic pressure test
While field testing the check valve of a spill resistant pressure vacuum breaker, the vent valve is opened and water continues to flow from the vent valve. What does this indicate?
Leaking No. 1 shutoff valve
Failure of the air inlet valve
Leaking No. 2 shutoff valve
Check valve is leaking
While recording the reading for the check valve during the field test of a spill resistant pressure vacuum breaker, which of the following is true?
Testcock closed, vent valve closed
Testcock closed, vent valve opened
Testcock open, vent valve open
Testcock open, vent valve closed
While observing a RP assembly prior to testing, the differential pressure relief valve is discharging continuously. This could indicate:
Leaking SOV #1
Fouled CV #2
Fouled RV
Fouled TC #2
A reverse flow condition in a piping system is created by a negative pressure in the supply piping. This is an example of:
Fluctuating pressure
Backsiphonage
Venturi effect
Backpressure
A backflow prevention assembly consisting of two independently operating, internally loaded approved check valves, located between two tightly closing shut off valves; with four appropriately located testcocks is as:
Double check valve assembly
Pressure vacuum breaker assembly
Atmospheric vacuum breaker
Reduced pressure principle backflow prevention assembly
The static pressure drop of the first and second check valves in a reduced pressure principle backflow prevention assembly is typically:
Different
The same
Different by 2 psi
Less than 1 psi
What are acceptable field test readings for a properly operating pressure vacuum breaker?
Air inlet: 0.0 psid and above
Check valve: 0.0 psid and above
Air inlet: 0.0 psid to 1.0 psid
Check valve: Less than 1.0 psid
Air inlet: 1.0 psid and above
Check valve: 1.0 psid and above
Air inlet: 1.0 psid and above
Check valve: 0.0 psid to 0.9 psid
Inlet pressure to a properly installed and operating spill resistant pressure vacuum breaker is reduced to zero psig with a no flow condition through the assembly. This will cause the air inlet valve to:
Fail
Discharge water
Stay closed
Open to atmosphere
A non-health hazard is a term that describes:
The condition when sewers and water mains are too close together
Something that could cause death or health problems in the water
Is not nomenclature used in the backflow industry
A material that would cause taste, odor or color change to the water
Once potable water passes through an air gap into a receiving vessel it is considered to be:
An intermittent discharge
Non-potable water
Potable water
A barometric loop
When performing the field test on the first check of a double check valve assembly with a differential gauge the reading on the gauge will not drop below 10 psid with continual flow coming out of testcock #3. This would indicate the:
CV #2 is leaking
CV #1 failure
SOV #1 is leaking
CV #1 passes
When performing the field test on the first check of a double check valve assembly, the water level at testcock #3 recedes. What does this imply?
CV #2 and SOV #2 leaks
CV #2 and SOV #1 leaks
CV #1 and SOV #2 leaks
CV #1 and SOV #1 leaks
While field testing the second check of a double check valve assembly, water continues to flow from testcock #4. You open the bleedoff valve and a small amount of water comes out of the bleedoff valve and then stops. The gauge reading goes to zero, and water continues to flow from testcock #4. How would you obtain the proper reading for the second check valve.
Move the gauge to the centerline of the assembly and record the gauge reading
Record the check valve as leaking
Close #4 testcock
Record the observed reading prior to opening the BVA
To determine if a cross-connection represents a potential health or non-health hazard to the water supply you determine:
If it is a direct or indirect cross-connection
The type of backflow condition
The degree of hazard
If it is a service or isolation protection application
A field test on a double check valve assembly indicates both check valves closed tight above 1.0 psid, but a bleed off valve had to be used to achieve the proper results. This would indicate the assembly:
Failed the field test
Field test must be done again
Must be replaced
Passed the field test
A city distribution main for potable water has a pressure of 100 psi coming out of the pumping station. Immediately out of the pumping station a pipeline carries the water up a 50 foot hill to a water users house. The maximum pressure at the point of delivery would be approximately:
125 psi
50 psi
78 psi
100 psi
Two types of cross-connections are:
Static or fluctuating
Venturi or aspirator
Direct or indirect
Backpressure or backsiphonage
How many testcocks are there on a pressure vacuum breaker assembly?
None
1
4
2
How many testcocks are there on a spill resistant pressure vacuum breaker assembly?
None
1
4
2
How many testcocks are there on a double check valve assembly?
None
1
4
2
How many testcocks are there on a reduced pressure principle backflow prevention assembly?
None
1
4
2
A double check valve assembly can be used for a:
Health hazard
Backsiphonage condition only
Backpressure condition only
Non-health hazard
A city distribution main for potable water has a pressure of 100 psi coming out of the pumping station. Immediately out of the pumping station a pipeline carries the water up a 100 foot hill to a water users house. The maximum pressure at the point of delivery would be approximately:
125 psi
50 psi
78 psi
100 psi
A city distribution main for potable water has a pressure of 100 psi. At the same elevation a pipeline carries the water to a water users house. The maximum pressure at the point of delivery would be approximately:
125 psi
50 psi
78 psi
100 psi
Which of the following provides the highest degree of protection when properly installed?
AVB
DCVA
AG
PVB
Who is responsible for submitting field test results to the administrative authority?
State Cross-Connection Officer
Backflow Prevention Assembly Manufacturer
Backflow Prevention Assembly Tester
Plumbing Inspector
While field testing the #2 CV of a RP, the high side pressure is applied through TC #4 and the gauge reading decreases slightly. What is the most likely cause of this decrease?
Leaking SOV #1
Leaking SOV #2
Disc compression of the RV
Disc compression of the #2 CV
While field testing the CV of a PVB, water continues to flow from the No. 2 testcock. How do you proceed?
Record the reading on the gauge
Attach bleed off valve to No. 2 testcock
Close testcocks and remove all equipment
Open bleed off valve until flow slows to a slight drip
The Federal Safe Drinking Water Act states that the water purveyor is responsible for the quality of the potable water:
If they choose
To the point of service
To the water treatment plant
Only if they have a cross-connection control program
While field testing a spill resistant pressure vacuum breaker the following field test results are obtained. Air inlet opened at 1.9 psid, and the check valve held at 0.9 psid. What results shall be reported on the field test report?
Assembly failed
Assembly passed
SOV #1 leaked
Assembly not installed correctly
While recording the reading for the check valve during the field test of a spill resistant pressure vacuum breaker, which of the following is true?
Testcock open, vent valve closed
Testcock closed, vent valve open
Testcock closed, vent valve closed
Testcock open, vent valve open
What are acceptable field test readings for a properly operating double check valve assembly?
Check Valve #1: 1.0 psid and above Check Valve #2: 1.0 psid and above
Check Valve #1: 3.0 psid greater than the RV opening point Check Valve #2: 2.0 psid
Check Valve #1: 0.1 psid and above Check Valve #2: 0.1 psid and above
Check Valve #1: 0.0 psid to 1.0 psid Check Valve #2: Less than 1.0 psid
On a private water system, a pump is used to increase the pressure for the water user. When pressure is increased on the water users internal plumbing system above the supply line pressure, this creates:
A cross-connection
Backpressure
Backsiphonage
An illegal use
Which of the following information would not be required on a backflow prevention assembly field test report:
Differential pressure gauge results
Backflow prevention assembly tester identification
Assembly identification (make, model, serial number)
Field test procedure
If water is continuously flowing from the relief valve port of a RPBA, it should be reported that:
the #2 shutoff valve has failed
The distribution line is being subjected to pressure surges
Relief valve is stuck closed
The first check valve may be fouled
When field testing an RP, what shall be done after determining the apparent first check valve differential?
Close all control valves, observe and record this reading
Determine the opening point of the differential pressure relief valve
Confirm the tightness of check valve #2
Record the differential pressure across check valve #2
When field testing an RPZ, the tester must:
Close the #2 SOV
Maintain static pressure on the #1 testcock
Exercise the differential pressure relief valve first
Close the #2 SOV, then close the #1 SOV
There is a continuous discharge from the differential pressure relief valve of an RPPA. The static pressure drop across the first check valve is 9.0 psi. The malfunction is most likely:
#1 check valve fouled
Line pressure fluctuating
#2 check valve fouled
Fouled relief valve
The two types of cross-connections are:
Backsiphonage and Backpressure
Upper and Lower
Pollutant and Contaminant
Direct and Indirect
The minimum acceptable pressure loss across each check valve in a double check valve assembly is:
3.0 psi
1.0 psid
1.0 psi
2.0 psi
When field testing the first check valve of a double-check valve assembly, if water continues to flow from testcock #3, this implies that:
Shutoff valve #2 is holding tight
Shutoff valve #1 leaks
Check valve #2 leaks
Check valve #1 leaks
An air gap:
Is the only accepted method of separating a water line from a sewage line
Protects against backpressure and backsiphonage
Must be a minimum of 1” above the flood rim of the receiving receptacle
All of the above
A properly installed air gap requires the minimum height of a water supply line above the overflow rim of a receptacle to be:
2”
1”
1’
6”
When field testing a PVB, the first component tested is the:
Air inlet valve
Testcock #3
Check valve
Differential pressure relief valve
The bleed-off arrangement used in field testing a double check valve assembly is primarily used for:
Differential pressure relief valve leaks
#1 shutoff valve leaks
#1 check valve leaks
#2 check valve leaks
A double check valve assembly:
Will stop backflow when one check valve is holding tight
Will prevent backflow with both check valves leaking
If field tested quarterly, is equivalent to an RP
May be installed as service protection to a sewer treatment plant
The minimum acceptable pressure drop across each check valve of a DCVA is:
3.0 psi
10 psi
2.0 psi
1.0 psid
A property with multiple water services has been surveyed with several hazards being noted. What course of action is correct?
All services shall be protected with a backflow protection assembly conforming to the degree of hazard.
Drain all lines prior to installation
All persons on the property must be notified
All services must be exposed for inspection
The average weight of a cubic foot of water at sea level is:
62.4 lbs
110.6 lbs.
7.48 lbs
8.34 lbs
