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Backflow Test | 63 Questions and Answers 100% Correct | Updated
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Backflow Test | 63 Questions and Answers 100% Correct | Updated
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Backflow Test | 63 Questions and Answers100% Correct | Updated 2024-2025
If an RPBA continually 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
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
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