UPDATE!!!!2025/2026|GUARANTEED
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
1
, The _____ test cock of an RPBA is located on the inlet side of the assembly -
ANSWER #1
If a 10" RPBA doesnt test properly - ANSWER Check to see if the downstream gate
valve is leaking
Back flow prevention testing equipment should be accuracy verified at least every _______ -
ANSWER year
A damaged or dirty disc or seat of an RPBA may account for ______ - ANSWER A low
first check differential
Inconsistent, erratic test results found when testing a RPBA means that -
ANSWER There is air in the assembly
If you get "impossible" test kit readings when testing an assembly - ANSWER First
check to see if hoses are hooked up to the right test ports
When testing a PVB, the air inlet valve does not open as the gauge drops to 0 -
ANSWER The air inlet disc is stuck to the seat in the up position
To continue practicing the profession, grade 6 operators must complete CE before the
expiration date of every ________ year renewal period - ANSWER 3
Nebraska regulations require that backflow prevention assemblies be tested ________ -
ANSWER Once each year
If an RPBA dips continually from the vent, the problem could be ________ -
ANSWER The #1 check valve is faulty
2
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
1
, The _____ test cock of an RPBA is located on the inlet side of the assembly -
ANSWER #1
If a 10" RPBA doesnt test properly - ANSWER Check to see if the downstream gate
valve is leaking
Back flow prevention testing equipment should be accuracy verified at least every _______ -
ANSWER year
A damaged or dirty disc or seat of an RPBA may account for ______ - ANSWER A low
first check differential
Inconsistent, erratic test results found when testing a RPBA means that -
ANSWER There is air in the assembly
If you get "impossible" test kit readings when testing an assembly - ANSWER First
check to see if hoses are hooked up to the right test ports
When testing a PVB, the air inlet valve does not open as the gauge drops to 0 -
ANSWER The air inlet disc is stuck to the seat in the up position
To continue practicing the profession, grade 6 operators must complete CE before the
expiration date of every ________ year renewal period - ANSWER 3
Nebraska regulations require that backflow prevention assemblies be tested ________ -
ANSWER Once each year
If an RPBA dips continually from the vent, the problem could be ________ -
ANSWER The #1 check valve is faulty
2
