NHIE Plumbing 2

Question 1

What is the minimum slope required for a horizontal drain pipe of 3 inches or less in diameter?

Accepted Answer

1/4 inch per foot

Answer

Horizontal drain pipes 3 inches or less in diameter require a minimum slope of 1/4 inch per foot to ensure proper drainage.

Question 2

Which type of pipe is NOT approved for use as a drain, waste, and vent (DWV) pipe in most US jurisdictions?

Accepted Answer

CPVC

Answer

CPVC (chlorinated polyvinyl chloride) is approved for hot and cold water supply lines but is not approved for DWV applications.

Question 3

A home inspector observes a P-trap installed below the floor slab with no access. What is the primary concern?

Accepted Answer

The trap is inaccessible for cleaning and cannot be inspected for leaks

Answer

Traps installed below the floor slab must be accessible for cleaning and inspection; inaccessible traps are a deficiency.

Question 4

What does a water hammer arrestor prevent?

Accepted Answer

Pressure surges that cause banging pipes when valves close quickly

Answer

Water hammer arrestors absorb the pressure shock wave created when fast-closing valves suddenly stop water flow, preventing pipe banging.

Question 5

An inspector finds a vent pipe that terminates 6 inches above the roof surface. What should be noted?

Accepted Answer

In cold climates, the termination should be at least 12 inches above the roof to prevent frost closure

Answer

In climates subject to frost, vent pipe terminations should extend at least 12 inches above the roof to reduce risk of frost closure blocking the vent.

(NHIE) National Home Inspector Examination Practice Test

(NHIE) National Home Inspector Examination Practice Test

NHIE Plumbing 2