Journeyman Plumbers Exam Backflow Prevention 5

Question 1

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

Accepted Answer

Low-hazard (non-health) connections only

Answer

DCVAs are rated for low-hazard (non-health) cross-connections where contamination would be a nuisance but not a health risk, such as lawn irrigation without chemical injection.

Question 2

Under the International Plumbing Code (IPC), which backflow preventer is required for a medical dental chair water supply?

Accepted Answer

Reduced pressure zone assembly

Answer

Dental chair water supplies are considered high-hazard due to potential biological contamination, requiring an RPZ assembly.

Question 3

What is the minimum distance an RPZ assembly's relief port discharge must be from a sanitary drain receptor to prevent a cross-connection?

Accepted Answer

The discharge must never connect directly to the drainage system

Answer

The RPZ relief port discharge must terminate with an air gap and must never be directly piped into the drainage system to prevent a drainage cross-connection.

Question 4

Which standard published by ASSE specifically covers reduced pressure zone backflow preventers?

Accepted Answer

ASSE 1013

Answer

ASSE 1013 is the performance standard for reduced pressure principle backflow preventers used in potable water systems.

Question 5

A plumber connects a chemical feed pump directly to a potable water line without any backflow protection. This is best described as:

Accepted Answer

An illegal cross-connection creating a high-hazard condition

Answer

Any direct connection between a chemical feed system and the potable supply without proper backflow protection is an illegal high-hazard cross-connection.

Journeyman Plumbers Exam Practice Test

Journeyman Plumbers Exam Practice Test

Journeyman Plumbers Exam Backflow Prevention 5