NHIE Plumbing 3

Question 1

What is the maximum temperature a residential water heater should be set to in order to prevent scalding?

Accepted Answer

120°F

Answer

100°F

Answer

110°F

Answer

140°F

Question 2

A home inspector identifies copper supply pipes with a greenish-white crust on the outside of soldered joints. What does this indicate?

Accepted Answer

Active or past pinhole leaks or weeping at the solder joint

Answer

Normal aging of copper pipe requiring no action

Answer

The pipe has been exposed to excessive water pressure

Answer

Evidence of electrolytic corrosion from dissimilar metals only

Question 3

Which material requires a dielectric union when connected directly to copper pipe?

Accepted Answer

Galvanized steel pipe

Answer

PEX tubing

Answer

CPVC pipe

Answer

PVC pipe

Question 4

What is the function of a pressure-reducing valve (PRV) installed on the main water supply?

Accepted Answer

It reduces incoming municipal water pressure to a safe range for household plumbing

Answer

It boosts pressure for homes on low-pressure municipal systems

Answer

It filters sediment from the incoming water supply

Answer

It prevents backflow into the municipal supply

Question 5

An inspector notes that a floor drain in a basement utility room has no visible water in the trap. What is the recommended correction?

Accepted Answer

Pour water into the drain to replenish the trap seal and prevent sewer gas entry

Answer

Cap the drain permanently

Answer

Install a new P-trap

Answer

Add a vent pipe to the drain

Question 6

What type of pipe fitting is used to change direction 90 degrees on a DWV drain line while minimizing flow restriction?

Accepted Answer

Long-sweep 90-degree elbow

Answer

Standard 90-degree elbow (ell)

Answer

Sanitary tee

Answer

Street elbow

Question 7

Which condition indicates a sump pump system requires attention during a home inspection?

Accepted Answer

The discharge pipe terminates near the window well of the basement

Answer

The sump pump discharges to the yard at least 6 feet from the foundation

Answer

The sump pit has a sealed lid with a vent

Answer

The pump activates when water is poured into the pit