Master Plumber Backflow Prevention and Safety Questions and Answers

Question 1

A commercial irrigation system that utilizes chemical injectors for fertilization is being installed.
This system operates under continuous pressure.
Which backflow prevention assembly is required to protect the potable water supply from this high-hazard cross-connection?

Accepted Answer

Reduced Pressure Zone (RPZ) Assembly

Answer

Double Check Valve Assembly (DCVA)

Answer

Atmospheric Vacuum Breaker (AVB)

Answer

Hose Bibb Vacuum Breaker (HBVB)

Question 2

Which of the following statements is a mandatory and correct installation requirement for an Atmospheric Vacuum Breaker (AVB)?

Accepted Answer

It must be installed at least 6 inches above all downstream piping and outlets.

Answer

It is suitable for installation in a location subject to continuous pressure.

Answer

It is designed to protect against both backsiphonage and backpressure.

Answer

It must have a shutoff valve installed immediately downstream for service.

Question 3

A backflow event caused by a significant pressure drop in the municipal water main, such as from a main break or firefighting activities, is defined as what condition?

Accepted Answer

Backsiphonage

Answer

Backpressure

Answer

Water hammer

Answer

Hydrostatic shock

Question 4

When installing a Reduced Pressure Zone (RPZ) backflow preventer inside a building, what is a critical requirement specific to this type of assembly to ensure its proper function and prevent property damage?

Accepted Answer

It must have a provision for adequate drainage from its relief valve.

Answer

It must be installed with the relief valve pointing up.

Answer

It can be installed vertically or horizontally without restriction.

Answer

It must be installed at least 36 inches above the finished floor.

Question 5

A potable water line supplies the make-up water for a large fire sprinkler system that does not contain antifreeze or other chemical additives. Which backflow prevention assembly is most commonly used for this non-health hazard, continuous pressure application?

Accepted Answer

Double Check Valve Assembly (DCVA)

Answer

Pressure Vacuum Breaker (PVB)

Answer

Atmospheric Vacuum Breaker (AVB)

Answer

Air Gap

Question 6

In the hierarchy of backflow prevention methods, which of the following is considered the most positive and absolute form of protection?

Accepted Answer

An Air Gap

Answer

A Reduced Pressure Zone (RPZ) Assembly

Answer

A Double Check Valve Assembly (DCVA)

Answer

A Pressure Vacuum Breaker (PVB)

A commercial irrigation system that utilizes chemical injectors for fertilization is being installed.This system operates under continuous pressure.Which backflow prevention assembly is required to protect the potable water supply from this high-hazard cross-connection?

A commercial irrigation system that utilizes chemical injectors for fertilization is being installed.
This system operates under continuous pressure.
Which backflow prevention assembly is required to protect the potable water supply from this high-hazard cross-connection?