PC Plumber Water & Drainage 4

Question 1

What is the fixture unit value assigned to a standard toilet (water closet) for drainage load calculations?

Accepted Answer

4 DFUs

Answer

A standard gravity-flush toilet is assigned 4 drainage fixture units (DFUs) under the IPC for sizing drain pipes.

Question 2

A backwater valve (backflow preventer) installed on a building drain protects against which condition?

Accepted Answer

Sewage backing up from the municipal sewer into the building

Answer

A backwater valve prevents municipal sewer sewage from flowing backward into the building during a sewer overflow event.

Question 3

What is the maximum allowable working pressure for standard Schedule 40 PVC pressure pipe at 73°F?

Accepted Answer

160 psi

Answer

Schedule 40 PVC pipe is rated at approximately 160 psi working pressure at 73°F for a 1-inch diameter pipe (varies slightly by size).

Question 4

When solvent cementing PVC pipe, what must be applied to both the pipe and fitting before the solvent cement?

Accepted Answer

Purple primer

Answer

Purple primer (PVC primer) must be applied to both the pipe end and fitting socket before solvent cement to clean and soften the PVC for a proper bond.

Question 5

A grease trap is required when installing commercial kitchen drainage. Where is it installed?

Accepted Answer

Between the kitchen fixtures and the sanitary drain system

Answer

A grease trap is installed between commercial kitchen fixtures and the sanitary drain to intercept fats, oils, and grease before they enter the sewer.

(PC) Plumber Certification Practice Test

(PC) Plumber Certification Practice Test

PC Plumber Water & Drainage 4