BACKFLOW TEST QUESTIONS AND
ANSWERS
If an RPBA contiunually drips or drains under full flow conditions - Correct Answers -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 - Correct Answers -
Thermal expansion tank
According to the Nebraska regulations what is the minimum acceptable air gap for a 2"
pipe located 1" from the wall - Correct Answers -6"
The RPBA must have a provision to drain away at least _____ times the rated flow of
the assembly - Correct Answers -4
When velocity of the water flowing in a service pipe increases, the pressure available at
the consumers tap _________ - Correct Answers -Decreases
The second check valve of a DCVA has become distorted. What could have caused
this? - Correct Answers -Water hammer
The RPBA #1 check valve is ___________ - Correct Answers -A heavier spring than
used in the #2 check valve
The check valve spring of a PVB ________ - Correct Answers -Closes the check valve
The _____ test cock of an RPBA is located on the inlet side of the assembly - Correct
Answers -#1
If a 10" RPBA doesnt test properly - Correct Answers -Check to see if the downstream
gate valve is leaking
Back flow prevention testing equipment should be accuracy verified at least every
_______ - Correct Answers -year
A damaged or dirty disc or seat of an RPBA may account for ______ - Correct Answers
-A low first check differential
, Inconsistent, erratic test results found when testing a RPBA means that - Correct
Answers -There is air in the assembly
If you get "impossible" test kit readings when testing an assembly - Correct Answers -
First check to see if hoses are hooked up to the right test ports
Although not recommended because of the high risk of contamination, Nebraska
standards describe mercury manometers can be used to calibrate - Correct Answers -
Differential pressure gauges
Nebraska standards require that an RPBA have two independently operating check
valves with a ______ relief valve located between the check valves - Correct Answers -
Mechanically independent
Nebraska standards require that the DCVA must have to be tightly closing _______
shut off valves four _______ test ports - Correct Answers -Resilient seated
Resilient seated
When testing a PVB, the air inlet valve does not open as the gauge drops to 0 - Correct
Answers -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 - Correct Answers -3
Nebraska regulations require that backflow prevention assemblies be tested ________ -
Correct Answers -Once each year
If an RPBA dips continually from the vent, the problem could be ________ - Correct
Answers -The #1 check valve is faulty
High hazard locations according to the NDHSS DPH regulations include _______ -
Correct Answers -Truck (water) loading stations
Which statement is correct according to the Nebraska regulations - Correct Answers -
Annual testing is required for RPBAs`
If the relief valve fails to open while testing a RPBA, the problem could be - Correct
Answers -A fouled sensing line
Water leakage over the top of an AVB may be cause by _________ - Correct Answers -
A damaged or corroded guide
A leaky check valve of a DCVA could be due to _________ - Correct Answers -The
guide members hanging up
A problem sometimes after repairing a DCVA is _______ - Correct Answers -A noisy
vibration
ANSWERS
If an RPBA contiunually drips or drains under full flow conditions - Correct Answers -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 - Correct Answers -
Thermal expansion tank
According to the Nebraska regulations what is the minimum acceptable air gap for a 2"
pipe located 1" from the wall - Correct Answers -6"
The RPBA must have a provision to drain away at least _____ times the rated flow of
the assembly - Correct Answers -4
When velocity of the water flowing in a service pipe increases, the pressure available at
the consumers tap _________ - Correct Answers -Decreases
The second check valve of a DCVA has become distorted. What could have caused
this? - Correct Answers -Water hammer
The RPBA #1 check valve is ___________ - Correct Answers -A heavier spring than
used in the #2 check valve
The check valve spring of a PVB ________ - Correct Answers -Closes the check valve
The _____ test cock of an RPBA is located on the inlet side of the assembly - Correct
Answers -#1
If a 10" RPBA doesnt test properly - Correct Answers -Check to see if the downstream
gate valve is leaking
Back flow prevention testing equipment should be accuracy verified at least every
_______ - Correct Answers -year
A damaged or dirty disc or seat of an RPBA may account for ______ - Correct Answers
-A low first check differential
, Inconsistent, erratic test results found when testing a RPBA means that - Correct
Answers -There is air in the assembly
If you get "impossible" test kit readings when testing an assembly - Correct Answers -
First check to see if hoses are hooked up to the right test ports
Although not recommended because of the high risk of contamination, Nebraska
standards describe mercury manometers can be used to calibrate - Correct Answers -
Differential pressure gauges
Nebraska standards require that an RPBA have two independently operating check
valves with a ______ relief valve located between the check valves - Correct Answers -
Mechanically independent
Nebraska standards require that the DCVA must have to be tightly closing _______
shut off valves four _______ test ports - Correct Answers -Resilient seated
Resilient seated
When testing a PVB, the air inlet valve does not open as the gauge drops to 0 - Correct
Answers -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 - Correct Answers -3
Nebraska regulations require that backflow prevention assemblies be tested ________ -
Correct Answers -Once each year
If an RPBA dips continually from the vent, the problem could be ________ - Correct
Answers -The #1 check valve is faulty
High hazard locations according to the NDHSS DPH regulations include _______ -
Correct Answers -Truck (water) loading stations
Which statement is correct according to the Nebraska regulations - Correct Answers -
Annual testing is required for RPBAs`
If the relief valve fails to open while testing a RPBA, the problem could be - Correct
Answers -A fouled sensing line
Water leakage over the top of an AVB may be cause by _________ - Correct Answers -
A damaged or corroded guide
A leaky check valve of a DCVA could be due to _________ - Correct Answers -The
guide members hanging up
A problem sometimes after repairing a DCVA is _______ - Correct Answers -A noisy
vibration
