BACKFLOW MULTIPLE CHOICE TEST
#1
Which type of backflow preventer is most reliable - Correct Answers -Air gap
What is the maximum pressure drop a little through a double check now assembly -
Correct Answers -10 psi
To break the back-siphonage action the best approach is - Correct Answers -Introduce
air into the system
The maximum height that water can be drawn above a free water surface by back-
siphoange is - Correct Answers -34 feet
Watermain pressure is drastically reduced to a reduce pressure principal backflow
preventer the relief valve should - Correct Answers -Always open to discharge the water
in the zone
In approved Errgott must have at least __________of free air space - Correct Answers -
A minimum of two pipe diameter of the supply pipe or 6 inches which ever is lesser
What is the most important step before installing backflow prevention assemblies in new
or existing lines - Correct Answers -Play planes will be flushed all chips scale and
foreign matter
Before testing a reduce pressure backflow prevention assembly you noticed relief vent
is spitting periodically this is caused by - Correct Answers -Line pressure fluctuation
How do you determine whether #2 Shut off valve is leaking while testing a reduced
pressure principal assembly - Correct Answers -Relief valve does not want to open
If the relief valve vent of AARP starts to drip after turn off shut off valve #2 this indicates
- Correct Answers -Check valve #1 leaks
If back pressure is applied to a reduced pressure principal backflow preventer the relief
valve should - Correct Answers -Open only if second check valve is failed
A parallel side-by-side backflow prevention assembly installation as desired in order to -
Correct Answers -Allow for testing and maintenance
#1
Which type of backflow preventer is most reliable - Correct Answers -Air gap
What is the maximum pressure drop a little through a double check now assembly -
Correct Answers -10 psi
To break the back-siphonage action the best approach is - Correct Answers -Introduce
air into the system
The maximum height that water can be drawn above a free water surface by back-
siphoange is - Correct Answers -34 feet
Watermain pressure is drastically reduced to a reduce pressure principal backflow
preventer the relief valve should - Correct Answers -Always open to discharge the water
in the zone
In approved Errgott must have at least __________of free air space - Correct Answers -
A minimum of two pipe diameter of the supply pipe or 6 inches which ever is lesser
What is the most important step before installing backflow prevention assemblies in new
or existing lines - Correct Answers -Play planes will be flushed all chips scale and
foreign matter
Before testing a reduce pressure backflow prevention assembly you noticed relief vent
is spitting periodically this is caused by - Correct Answers -Line pressure fluctuation
How do you determine whether #2 Shut off valve is leaking while testing a reduced
pressure principal assembly - Correct Answers -Relief valve does not want to open
If the relief valve vent of AARP starts to drip after turn off shut off valve #2 this indicates
- Correct Answers -Check valve #1 leaks
If back pressure is applied to a reduced pressure principal backflow preventer the relief
valve should - Correct Answers -Open only if second check valve is failed
A parallel side-by-side backflow prevention assembly installation as desired in order to -
Correct Answers -Allow for testing and maintenance
