IA Backflow Prevention & Cross-Connection Control 2

Question 1

Which backflow prevention assembly provides the highest level of protection against both back-pressure and back-siphonage?

Accepted Answer

Reduced Pressure Zone (RPZ) assembly

Answer

Atmospheric Vacuum Breaker (AVB)

Answer

Pressure Vacuum Breaker (PVB)

Answer

Double Check Valve (DCV) assembly

Question 2

An Atmospheric Vacuum Breaker (AVB) must be installed at what position relative to the highest downstream outlet?

Accepted Answer

At least 6 inches above the highest downstream outlet

Answer

At least 6 inches below the highest downstream outlet

Answer

At the point of connection to the water meter regardless of outlet elevation

Answer

Underground in a valve box at the same elevation as the lateral lines

Question 3

How does a Pressure Vacuum Breaker (PVB) differ from an Atmospheric Vacuum Breaker (AVB)?

Accepted Answer

A PVB can remain under continuous pressure due to its internally loaded check valve and poppet

Answer

A PVB cannot be placed under continuous supply pressure

Answer

A PVB is only approved for low-hazard applications, while an AVB handles high hazards

Answer

A PVB does not require annual field testing unlike the AVB

Question 4

A Double Check Valve (DCV) assembly is most appropriate for which type of application?

Accepted Answer

Low-to-moderate hazard applications where the potential contaminant is not a health threat

Answer

High-hazard applications such as chemical or fertilizer injection systems

Answer

Situations where there is absolutely no risk of back-pressure from the downstream system

Answer

Locations where maintaining a physical air gap is not structurally possible

Question 5

Which backflow prevention device is NOT testable in the field using standard test equipment?

Accepted Answer

Atmospheric Vacuum Breaker (AVB)

Answer

Reduced Pressure Zone (RPZ) assembly

Answer

Double Check Valve (DCV) assembly

Answer

Pressure Vacuum Breaker (PVB)

Question 6

Under which conditions is it acceptable to install a Pressure Vacuum Breaker (PVB) for residential or commercial irrigation?

Accepted Answer

When no chemical injection is used and the PVB is installed above all downstream outlets

Answer

When the irrigation system uses chemical injection or fertilizer proportioning

Answer

When the system is supplied by reclaimed or recycled water

Answer

When the local water authority has specifically required an RPZ on the permit

Question 7

How many independently operating check valves are contained in a Reduced Pressure Zone (RPZ) assembly?

Accepted Answer

Two check valves plus a differential pressure relief valve

Answer

One check valve and one pressure regulator

Answer

Three check valves in series

Answer

Two check valves with no additional relief valve