Backflow Final Exam Questions and
Correct Answers
All the following are required parts of an atmospheric vacuum breaker (asse1001) except a
Air inlet float valve
The body
Air canopy
Shutoff valve - <CORRECT ANSWER >>Shutoff valve
A single check valve for a backflow prevention is acceptable
For low hazard
For non-hazard residential
applications
On boilers only
Never - <CORRECT ANSWER >>Never
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 - <CORRECT ANSWER >>10.5 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 - <CORRECT ANSWER >>12 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 - <CORRECT ANSWER >>Maintain 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 - <CORRECT ANSWER >>All 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 - <CORRECT ANSWER >>Less than
The required number of test cocks on a two inch and smaller pressure vacuum breaker
assembly (asse 1020) is
, None
One
Two
Three - <CORRECT ANSWER >>Two
The springs on the two check valves of a reduced pressure principle backflow preventer (asse
1013) are
Identical
Externally loaded
Not interchangeable
Interchangeable - <CORRECT ANSWER >>Not 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
Correct Answers
All the following are required parts of an atmospheric vacuum breaker (asse1001) except a
Air inlet float valve
The body
Air canopy
Shutoff valve - <CORRECT ANSWER >>Shutoff valve
A single check valve for a backflow prevention is acceptable
For low hazard
For non-hazard residential
applications
On boilers only
Never - <CORRECT ANSWER >>Never
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 - <CORRECT ANSWER >>10.5 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 - <CORRECT ANSWER >>12 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 - <CORRECT ANSWER >>Maintain 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 - <CORRECT ANSWER >>All 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 - <CORRECT ANSWER >>Less than
The required number of test cocks on a two inch and smaller pressure vacuum breaker
assembly (asse 1020) is
, None
One
Two
Three - <CORRECT ANSWER >>Two
The springs on the two check valves of a reduced pressure principle backflow preventer (asse
1013) are
Identical
Externally loaded
Not interchangeable
Interchangeable - <CORRECT ANSWER >>Not 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
