Home Inspector Test Home Inspector Plumbing DWV Systems 4

Question 1

What is the minimum diameter of a building drain that receives discharge from a toilet?

Accepted Answer

3 inches

Answer

A toilet (water closet) requires a minimum 3-inch drain to accommodate solid waste without clogging.

Question 2

A home inspector finds that the trap for a floor drain in the basement has no water in it. What hazard does this create?

Accepted Answer

Sewer gases can enter the living space

Answer

A dry trap has no water seal to block sewer gases, allowing hydrogen sulfide and methane to enter the building, creating health and safety hazards.

Question 3

Under US plumbing codes, where must a building drain clean-out be located?

Accepted Answer

Near the connection to the public sewer and at the base of each vertical stack

Answer

Code typically requires a clean-out near where the building drain exits the foundation and at the base of each soil or waste stack for maintenance access.

Question 4

Which of the following is a sign of a failed or missing trap primer on a floor drain?

Accepted Answer

Sewer odor in the room with the floor drain

Answer

A trap primer keeps infrequently used floor drain traps filled with water; without it the trap dries out and sewer gas enters the space.

Question 5

An inspector finds PVC drain pipe installed below the slab without bedding material and resting directly on soil. What is the primary concern?

Accepted Answer

Uneven soil settlement can stress joints and cause leaks

Answer

Without proper bedding and backfill, differential soil movement can crack or separate PVC joints, leading to underground leaks that are costly to repair.

Home Inspector Test Practice Test

Home Inspector Test Practice Test

Home Inspector Test Home Inspector Plumbing DWV Systems 4