BACKFLOW PREVENTION CLASS EXAM QUESTIONS AND VERIFIED
CORRECT ANSWERS ALREADY PASSED LATEST UPDATE
What does PSI A stand for?
Atmosphere
What does PSI D stand for?
Differential
How tall does a column need to be to make 1.0 PSI?
27.75 inches
What is the definition of back pressure?
An unwanted reversal of flow
What are the two types of back flow?
Backpressure and Backsiphonage
What causes backsiphonage?
loss of pressure
what causes back pressure?
having a higher pressure downstream
What is a cross connection?
Potential or actual connection between potable water and a questionable source
Give an example of an indirect cross connection
hose in a pool
Give an example of a direct cross connection
Booster pump
What do you need to have a good control program?
Legal authorty, backflow assemblies, certified testers, defensible records.
What is the minimum height of an air gap
1 inch
What is the maximum height of an air gap
6 inches
, What kind of back flow is a barometric loop used for?
Backsiphonage
What is the height of a barometric loop?
33.9 feet tall
What is an AVB?
Atmospheric Vacuum Breaker
minimum height of an AVB
6 inches
What are the limits of an AVB? Is it testable?
Not testable, no shut off downstream, only 12 hours of use a day.
What is an RP?
A reduced pressure Backflow assembly
What is the minimum and maximum height of an RP?
12 inches to 36 inches from the ground. 1 foot from each wall.
What is a DC?
A double check back flow assembly
What is the maximum and minimum height of a DC?
12 to 36 inches off the ground
What are DC's usually made for?
Fire systems
Can you use a DC with a contaminant?
No
What needs to be present in backflow assemblies to be used with contaminates?
Some kind of relief
What is a PVB?
A pressure vacuum breaker back flow assembly.
Can you use a PVB with a contaminant?
Yes
How many test cocks does a PVB have?
2
What is an SVB?
CORRECT ANSWERS ALREADY PASSED LATEST UPDATE
What does PSI A stand for?
Atmosphere
What does PSI D stand for?
Differential
How tall does a column need to be to make 1.0 PSI?
27.75 inches
What is the definition of back pressure?
An unwanted reversal of flow
What are the two types of back flow?
Backpressure and Backsiphonage
What causes backsiphonage?
loss of pressure
what causes back pressure?
having a higher pressure downstream
What is a cross connection?
Potential or actual connection between potable water and a questionable source
Give an example of an indirect cross connection
hose in a pool
Give an example of a direct cross connection
Booster pump
What do you need to have a good control program?
Legal authorty, backflow assemblies, certified testers, defensible records.
What is the minimum height of an air gap
1 inch
What is the maximum height of an air gap
6 inches
, What kind of back flow is a barometric loop used for?
Backsiphonage
What is the height of a barometric loop?
33.9 feet tall
What is an AVB?
Atmospheric Vacuum Breaker
minimum height of an AVB
6 inches
What are the limits of an AVB? Is it testable?
Not testable, no shut off downstream, only 12 hours of use a day.
What is an RP?
A reduced pressure Backflow assembly
What is the minimum and maximum height of an RP?
12 inches to 36 inches from the ground. 1 foot from each wall.
What is a DC?
A double check back flow assembly
What is the maximum and minimum height of a DC?
12 to 36 inches off the ground
What are DC's usually made for?
Fire systems
Can you use a DC with a contaminant?
No
What needs to be present in backflow assemblies to be used with contaminates?
Some kind of relief
What is a PVB?
A pressure vacuum breaker back flow assembly.
Can you use a PVB with a contaminant?
Yes
How many test cocks does a PVB have?
2
What is an SVB?
