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

Every 5 years during routine permit inspections

Answer

Every 6 months by the water utility

Answer

Monthly by the building maintenance staff

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 uses three check valves instead of two

Answer

The RPZ requires no annual testing unlike the DCVA

Answer

The RPZ can only be installed in a vertical orientation

Question 3

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

Accepted Answer

Low-to-moderate hazard cross-connections

Answer

High-hazard cross-connections only, such as chemical systems

Answer

Any hazard level including toxic chemical connections

Answer

Non-hazardous decorative water features only

Question 4

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

Accepted Answer

In a below-grade pit or vault

Answer

Above the highest downstream sprinkler head

Answer

On an outdoor lawn irrigation riser at least 12 inches above grade

Answer

On a potable water supply to an irrigation system

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

To regulate and limit water pressure at hose bib connections

Answer

To filter sediment before it reaches the garden hose connection

Answer

To automatically shut off water flow when the hose is disconnected

Question 6

Under most U.S. plumbing codes, who is authorized to perform the required testing of backflow prevention assemblies?

Accepted Answer

A certified backflow prevention assembly tester holding an approved certification

Answer

Any currently licensed journeyman or master plumber

Answer

The property owner or facilities manager with proper documentation

Answer

Only a licensed professional engineer registered in the state

Question 7

What is a spill-resistant pressure vacuum breaker (SVB) specifically designed to prevent?

Accepted Answer

Nuisance water spillage from the vent port during normal pressure fluctuations

Answer

Backpressure from booster pumps in high-rise buildings

Answer

Contamination from high-hazard chemical injection systems

Answer

Freeze damage to vacuum breaker assemblies in cold climates