PC Environmental & Hazard Management 3

Question 1

Which type of backflow preventer is required on a connection to a high-hazard cross-connection such as a chemical feed line?

Accepted Answer

Reduced pressure zone (RPZ) assembly

Answer

An RPZ (reduced pressure zone) assembly provides the highest level of backflow protection and is required for high-hazard cross-connections.

Question 2

What is the purpose of a grease trap in a commercial kitchen's plumbing system?

Accepted Answer

Intercept fats, oils, and grease before they enter the sewer

Answer

Grease traps capture fats, oils, and grease (FOG) to prevent sewer clogs and environmental contamination.

Question 3

When trenching near underground utilities, which minimum safe distance should a plumber maintain before hand-digging?

Accepted Answer

18 inches

Answer

Excavation within 18 inches of a marked utility line must be done by hand to avoid striking the utility.

Question 4

What does the term 'air gap' refer to in plumbing backflow prevention?

Accepted Answer

A vertical separation between a water outlet and flood level rim

Answer

An air gap is the unobstructed vertical distance between the water supply outlet and the flood level of a fixture, preventing backflow by physical separation.

Question 5

Which regulation requires plumbers to notify the local water authority before making connections to a public water main?

Accepted Answer

Clean Water Act cross-connection control programs

Answer

Cross-connection control programs under the Safe Drinking Water Act and Clean Water Act require notification before connections to public water mains.

(PC) Plumber Certification Practice Test

(PC) Plumber Certification Practice Test

PC Environmental & Hazard Management 3