BACKFLOW TEST QUESTIONS &
SOLUTIONS(RATED A+)
If an RPBA contiunually drips or drains under full flow conditions - ANSWER The #2
check valve is fouled
When a residential property has a backflow-prevention device/assembly installed on the
service line the best means to control thermal expansion is with a - ANSWER Thermal
expansion tank
According to the Nebraska regulations what is the minimum acceptable air gap for a 2"
pipe located 1" from the wall - ANSWER 6"
The RPBA must have a provision to drain away at least _____ times the rated flow of
the assembly - ANSWER 4
When velocity of the water flowing in a service pipe increases, the pressure available at
the consumers tap _________ - ANSWER Decreases
The second check valve of a DCVA has become distorted. What could have caused
this? - ANSWER Water hammer
The RPBA #1 check valve is ___________ - ANSWER A heavier spring than used in
the #2 check valve
The check valve spring of a PVB ________ - ANSWER Closes the check valve
The _____ test cock of an RPBA is located on the inlet side of the assembly - ANSWER
#1
A leaky check valve of a DCVA could be due to _________ - ANSWER The guide
members hanging up
A problem sometimes after repairing a DCVA is _______ - ANSWER A noisy vibration
A differential pressure relief vlave on an RPBA that failed after testing can have two
_________ which must be inspected - ANSWER Diaphragms
When you have re-assembled an RPBA, __________ to detertime if the relief valve has
closed - ANSWER Stick your fingers into the discharge port
The #2 test port of a DCVA is located - ANSWER Between the #1 shutoff valve and the
#1 check valve
, If after repairing a DCVA the device still does not test out "ok" - ANSWER The device
should be disassembled and the check valve seats re-cleaned
The _____ found in the second check valve of an RPBA is different than in the first -
ANSWER Spring
The backflow prevention assembly test report is required to be completed using the
forms (if any) provided by the PWS having jurisidiction because _____ - ANSWER The
grade VI operator is actually a specialized (limited) PWS operator licensed work under
the rules and regulations of a PWS
State drinking water regulations require fire protection sprinkler systems to comply with
______ - ANSWER AWWA Manual M14
What is that Duke, Midwest, Watts and Barton all have in common - ANSWER They all
sell testing equipment for testing RPBAs
When testing a PVB, the test gauge must be - ANSWER At the same height of the
assembly
The air inlet valve of a PVB device - ANSWER Is held open until sufficient pressure is
applied inside the PVB
Which method of protecting against high hazard back siphonage is the best - ANSWER
Air gap
After a backflow prevention assembly has been tested, a copy of the certified results is
provided to the ______ - ANSWER Owner
State regulations place the responsibility on the _______ for records of locations, type
of backflow preventers, and record of repairs of back flow preventers - ANSWER
Consumer
When reassembling components after repairs are made to a backflow prevention device
or assembly - ANSWER An approved nontoxic lubricant may be used
In order to be certain which device/assembly you are about to test, you should -
ANSWER Check and record the make, model, and serial number
A water column 55 1./2" high will create a pressure of _______ psi at the bottom -
ANSWER 2
To smooth a lightyly scratched check valve seat of a PVB, the best choice would be to
use - ANSWER Sand cloth
SOLUTIONS(RATED A+)
If an RPBA contiunually drips or drains under full flow conditions - ANSWER The #2
check valve is fouled
When a residential property has a backflow-prevention device/assembly installed on the
service line the best means to control thermal expansion is with a - ANSWER Thermal
expansion tank
According to the Nebraska regulations what is the minimum acceptable air gap for a 2"
pipe located 1" from the wall - ANSWER 6"
The RPBA must have a provision to drain away at least _____ times the rated flow of
the assembly - ANSWER 4
When velocity of the water flowing in a service pipe increases, the pressure available at
the consumers tap _________ - ANSWER Decreases
The second check valve of a DCVA has become distorted. What could have caused
this? - ANSWER Water hammer
The RPBA #1 check valve is ___________ - ANSWER A heavier spring than used in
the #2 check valve
The check valve spring of a PVB ________ - ANSWER Closes the check valve
The _____ test cock of an RPBA is located on the inlet side of the assembly - ANSWER
#1
A leaky check valve of a DCVA could be due to _________ - ANSWER The guide
members hanging up
A problem sometimes after repairing a DCVA is _______ - ANSWER A noisy vibration
A differential pressure relief vlave on an RPBA that failed after testing can have two
_________ which must be inspected - ANSWER Diaphragms
When you have re-assembled an RPBA, __________ to detertime if the relief valve has
closed - ANSWER Stick your fingers into the discharge port
The #2 test port of a DCVA is located - ANSWER Between the #1 shutoff valve and the
#1 check valve
, If after repairing a DCVA the device still does not test out "ok" - ANSWER The device
should be disassembled and the check valve seats re-cleaned
The _____ found in the second check valve of an RPBA is different than in the first -
ANSWER Spring
The backflow prevention assembly test report is required to be completed using the
forms (if any) provided by the PWS having jurisidiction because _____ - ANSWER The
grade VI operator is actually a specialized (limited) PWS operator licensed work under
the rules and regulations of a PWS
State drinking water regulations require fire protection sprinkler systems to comply with
______ - ANSWER AWWA Manual M14
What is that Duke, Midwest, Watts and Barton all have in common - ANSWER They all
sell testing equipment for testing RPBAs
When testing a PVB, the test gauge must be - ANSWER At the same height of the
assembly
The air inlet valve of a PVB device - ANSWER Is held open until sufficient pressure is
applied inside the PVB
Which method of protecting against high hazard back siphonage is the best - ANSWER
Air gap
After a backflow prevention assembly has been tested, a copy of the certified results is
provided to the ______ - ANSWER Owner
State regulations place the responsibility on the _______ for records of locations, type
of backflow preventers, and record of repairs of back flow preventers - ANSWER
Consumer
When reassembling components after repairs are made to a backflow prevention device
or assembly - ANSWER An approved nontoxic lubricant may be used
In order to be certain which device/assembly you are about to test, you should -
ANSWER Check and record the make, model, and serial number
A water column 55 1./2" high will create a pressure of _______ psi at the bottom -
ANSWER 2
To smooth a lightyly scratched check valve seat of a PVB, the best choice would be to
use - ANSWER Sand cloth
