BACKFLOW FINAL QUESTIONS &
SOLUTIONS(RATED A+)
All the following are required parts of an atmospheric vacuum breaker (asse1001)
except a
Air inlet float valve
The body
Air canopy
Shutoff valve - ANSWERShutoff valve
A single check valve for a backflow prevention is acceptable
For low hazard
For non-hazard residential
applications
On boilers only
Never - ANSWERNever
The following absolute pressure could cause backsiphonage to occur in a hydraulic
system (distribution system) at sea level
10.5 psia
15.0 psia
33.9 psia
100 psia - ANSWER10.5 psia
It is the recommended that double check backflow prevention assembly (asse 1015) be
installed with its lowest point a minimum of
Six inches from wall
Twelve inches from highest point of use
Twelve inches above the surrounding ground or floor
,Thirty inches above the surrounding ground or floor - ANSWER12 inches above
surrounding floor
When testing a double check valve backflow prevention assembly (asse1015) number
two shutoff valve must be closed first to
Prevent backpressure during the test
Prevent backsiphonage during the test
Hold water in the downstream piping
Maintain pressure in the assembly - ANSWERMaintain pressure in the assembly
Which of the following should be considered when installing a cross connection control
device or assembly?
Sidewall clearances
Degree of hazard
Distance of backflow device
from floor
All above - ANSWERAll above
Backflow can occur whenever the pressure in a potable water system is ______ the
pressure in a non potable piping system and the two systems are physically connected
Greater than
Less than
Equal to
About same as - ANSWERLess than
The required number of test cocks on a two inch and smaller pressure vacuum breaker
assembly (asse 1020) is
None
One
Two
, Three - ANSWERTwo
The springs on the two check valves of a reduced pressure principle backflow preventer
(asse 1013) are
Identical
Externally loaded
Not interchangeable
Interchangeable - ANSWERNot interchangeable
The spring relief valve assembly of a reduced pressure principle backflow preventer
(asse 1013) acts to
Force the relief valve open
Force the relief valve closed
Force the first check valve open
Force the first check valve closed - ANSWERForce the relief valve closed
Reduced pressure principle backflow preventer (asse 1013) shall not be installed in a
vertical position unless
It is an existing water service
The water pressure exceeds 160 psi
It is a pit instillation
The assembly has been tested and approved for installation in a vertical position -
ANSWERThe assembly has been tested and approved for installation in a vertical
position
The type of protection provided by an air gap separation is
Backsiphonage low hazard
Backpreassure low hazard
Backpreassure high and low hazard
SOLUTIONS(RATED A+)
All the following are required parts of an atmospheric vacuum breaker (asse1001)
except a
Air inlet float valve
The body
Air canopy
Shutoff valve - ANSWERShutoff valve
A single check valve for a backflow prevention is acceptable
For low hazard
For non-hazard residential
applications
On boilers only
Never - ANSWERNever
The following absolute pressure could cause backsiphonage to occur in a hydraulic
system (distribution system) at sea level
10.5 psia
15.0 psia
33.9 psia
100 psia - ANSWER10.5 psia
It is the recommended that double check backflow prevention assembly (asse 1015) be
installed with its lowest point a minimum of
Six inches from wall
Twelve inches from highest point of use
Twelve inches above the surrounding ground or floor
,Thirty inches above the surrounding ground or floor - ANSWER12 inches above
surrounding floor
When testing a double check valve backflow prevention assembly (asse1015) number
two shutoff valve must be closed first to
Prevent backpressure during the test
Prevent backsiphonage during the test
Hold water in the downstream piping
Maintain pressure in the assembly - ANSWERMaintain pressure in the assembly
Which of the following should be considered when installing a cross connection control
device or assembly?
Sidewall clearances
Degree of hazard
Distance of backflow device
from floor
All above - ANSWERAll above
Backflow can occur whenever the pressure in a potable water system is ______ the
pressure in a non potable piping system and the two systems are physically connected
Greater than
Less than
Equal to
About same as - ANSWERLess than
The required number of test cocks on a two inch and smaller pressure vacuum breaker
assembly (asse 1020) is
None
One
Two
, Three - ANSWERTwo
The springs on the two check valves of a reduced pressure principle backflow preventer
(asse 1013) are
Identical
Externally loaded
Not interchangeable
Interchangeable - ANSWERNot interchangeable
The spring relief valve assembly of a reduced pressure principle backflow preventer
(asse 1013) acts to
Force the relief valve open
Force the relief valve closed
Force the first check valve open
Force the first check valve closed - ANSWERForce the relief valve closed
Reduced pressure principle backflow preventer (asse 1013) shall not be installed in a
vertical position unless
It is an existing water service
The water pressure exceeds 160 psi
It is a pit instillation
The assembly has been tested and approved for installation in a vertical position -
ANSWERThe assembly has been tested and approved for installation in a vertical
position
The type of protection provided by an air gap separation is
Backsiphonage low hazard
Backpreassure low hazard
Backpreassure high and low hazard
