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

The RPZ assembly provides the highest mechanical protection because it maintains a zone of reduced pressure between two check valves and vents any backflow to the atmosphere via a relief valve.

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

AVBs must be installed at least 6 inches above the highest downstream outlet to prevent submersion and ensure the device can open to atmosphere and protect against siphonage.

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 has an internally loaded check valve and poppet assembly that allows it to remain under continuous supply pressure, whereas an AVB must not be subjected to continuous pressure.

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

DCVs are suitable for low-to-moderate hazard cross-connections where the potential contaminant would not pose a direct health hazard, such as non-toxic aesthetic contaminants.

Question 5

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

Accepted Answer

Atmospheric Vacuum Breaker (AVB)

Answer

Atmospheric Vacuum Breakers lack test cocks and cannot be field-tested; they must be replaced if suspected of failure, unlike RPZ, DCV, and PVB assemblies which have test ports.

IA - Irrigation Association Certification Practice Test

IA - Irrigation Association Certification Practice Test

IA Backflow Prevention & Cross-Connection Control 2