InterNACHI Plumbing Systems Inspection 3

Question 1

During a home inspection, the inspector notices the main water shutoff valve is a gate valve that is difficult to turn. The inspector should:

Accepted Answer

Note it as a deficiency and recommend evaluation by a plumber

Answer

A difficult-to-operate main shutoff is a safety concern and should be noted; the inspector should not force it, as it may break.

Question 2

What is a 'p-trap' designed to do?

Accepted Answer

Hold water to block sewer gases from entering the home

Answer

A p-trap holds a water seal that blocks sewer gases and vermin from entering the living space through the drain opening.

Question 3

What is the maximum temperature the water heater thermostat should be set to in order to prevent scalding while also inhibiting Legionella bacteria growth?

Accepted Answer

120°F

Answer

120°F is the commonly recommended setting that balances scald prevention with inhibiting Legionella growth, per most health and safety guidelines.

Question 4

An inspector finds that a washing machine drain hose is inserted more than 4 inches into the standpipe. This creates a risk of:

Accepted Answer

Back-siphonage of contaminated water into the machine

Answer

Inserting the drain hose too deep into the standpipe can create a siphon that draws contaminated drain water back into the washing machine.

Question 5

Which of the following best describes 'cross-connection' in plumbing?

Accepted Answer

A physical link where potable water may be contaminated by non-potable sources

Answer

A cross-connection is any actual or potential link between the potable water supply and a source of contamination or pollution.

(InterNACHI) International Association of Certified Home Inspectors Practice Test

(InterNACHI) International Association of Certified Home Inspectors Practice Test

InterNACHI Plumbing Systems Inspection 3