PC Backflow Prevention & Cross-Connection Control 2

Question 1

How frequently must testable backflow prevention assemblies be inspected and tested in most U.S. jurisdictions?

Accepted Answer

At least annually by a certified backflow tester

Answer

Most jurisdictions require testable backflow prevention assemblies to be inspected and tested at least once per year by a certified backflow prevention assembly tester.

Question 2

What distinguishes a reduced pressure zone (RPZ) assembly from a double check valve assembly (DCVA)?

Accepted Answer

The RPZ includes a differential pressure relief valve between its two check valves

Answer

The RPZ assembly includes a differential pressure relief valve in the zone between the two check valves that opens and discharges to atmosphere if either check valve fails or leaks.

Question 3

A double check valve assembly (DCVA) is approved for which hazard classification?

Accepted Answer

Low-to-moderate hazard cross-connections

Answer

DCVAs are approved for low-to-moderate hazard cross-connections (such as irrigation without chemical injection or fire sprinklers without additives) but are not suitable for high-hazard applications.

Question 4

Which location is NOT acceptable for installing a pressure vacuum breaker (PVB)?

Accepted Answer

In a below-grade pit or vault

Answer

PVBs cannot be installed below grade or in pits because the vent port opens to atmosphere when activated and could be submerged in water, negating its protective function.

Question 5

What is the primary purpose of a hose bib vacuum breaker installed on an outdoor faucet?

Accepted Answer

To prevent contaminated water from backsiphoning through a connected garden hose

Answer

Hose bib vacuum breakers prevent backsiphonage through garden hoses, which can be submerged in pools, chemical buckets, or other contaminated sources.

(PC) Plumber Certification Practice Test

(PC) Plumber Certification Practice Test

PC Backflow Prevention & Cross-Connection Control 2