interNachi Residential
Plumbing Overview | Questions
and Correct Answers | Latest
Update 2024/2025 | 100%
PASS
What are the four defects of plumbing? - Answer -a leak;
inadequate water supply;
water contamination;
and/or the incorrect installation of a component.
T/F: This course only addr...
What are the four defects of plumbing? - Answer -a leak;
inadequate water supply;
water contamination;
and/or the incorrect installation of a component.
T/F: This course only addresses code-related violations regarding
plumbing fixtures. - Answer -False
"Plumbing" comes from the Latin word "plumbum," which means
___________. - Answer -lead
T/F: Contamination can affect water's potability. - Answer -True
According to the InterNACHI Standards of Practice, the inspector is
required to _______ all the toilets. - Answer -flush
,T/F: The inspector is required to light or ignite pilot lights. - Answer -
False
If a home inspector observes a fuel storage tank, the inspector _____
describe that in the report. - Answer -must
Define ABS (acrylonitrile butadiene styrene): - Answer -Rigid black
plastic pipe used for drain, waste and vent lines.
Define access cover - Answer -Removable plate that permits access to a
pipe or pipe fitting for the purpose of inspection, maintenance, repair
or replacement.
Define access panel - Answer -An opening in the wall or ceiling near a
fixture that allows access for servicing the plumbing/electrical system.
Define accessible: - Answer -In the opinion of the inspector, can be
approached or entered safely without difficulty, fear or danger.
Define activate - Answer -To turn on, supply power, or enable systems,
equipment or devices to become active by normal operating controls.
Examples include turning on the gas or water supply valves to the
fixtures and appliances, and activating electrical breakers or fuses.
Define adaptor - Answer -A fitting that unites different types of pipe
together, such as ABS to cast-iron pipe.
Define aerator - Answer -An apparatus that mixes air into flowing water.
It is screwed onto the end of a faucet spout to help reduce splashing.
Define air-admittance valve - Answer -One-way valve designed to admit
air into the plumbing system to protect the traps from siphonage; a
,device used as an alternative to vents for individual fixtures and
branches in the plumbing drainage system.
Define air chamber - Answer -A vertical, air-filled pipe that prevents
water hammer by absorbing pressure when the water is shut off at a
faucet or valve.
Define air gap (drainage) - Answer -The unobstructed vertical distance
through free atmosphere between the outlet of the waste pipe and the
flood-level rim of the receptacle into which the waste pipe is
discharged.
Define air gap (water distribution) - Answer -The unobstructed vertical
distance through free atmosphere between the lowest opening from
any pipe or faucet that supplies water to a receptacle (sink, tank,
fixture, or other device) and the flood-level rim of that receptacle.
Define anti-scald - Answer -A valve that restricts water flow to help
prevent burn injuries. See pressure-balancing valve and thermostatic
valve. In some areas, plumbing codes require anti-scald valves.
Define anti-siphon - Answer -A device that prevents wastewater from
being drawn back into supply lines and possibly contaminating the
water supply.
Define aperture - Answer -An opening in a pipe.
Define appliance - Answer -An apparatus, device, or equipment
operated by use of electricity or fuel gas to produce heat, light, power,
refrigeration, or air conditioning.
, Define approved - Answer -Accepted by the code official, third-party
agency, authority having jurisdiction (AHJ), or conforming to a standard
such as ANSI.
Define back-pressure - Answer -Pressure created in a non-potable
system in excess of the water supply mains causing backflow. Back-
pressure can be created by mechanical means (such as a pump), by
static head pressure (including an elevated tank), or by thermal
expansion from a heat source (such as a water heater).
Define back-siphonage - Answer -The backflow of water caused by
system pressure falling below atmospheric pressure. Atmospheric
pressure supplies the force that reverses the flow.
Define backflow - Answer -The flow of liquids in potable water
distribution piping in reverse of their intended path. There are two
types of pressure conditions that cause backflow: back-siphonage and
back-pressure.
Define backflow preventer - Answer -A device or means to prevent
backflow into the potable water supply.
Define basket strainer - Answer -Basket-shaped strainer with holes
allowing water to drain while catching food or other solids; can also be
closed to fill the sink with water.
Define bell reducer - Answer -A fitting shaped like a bell that has one
opening of a smaller diameter used to reduce the size of the pipe in the
line, and the opposite opening of larger diameter.
Define bidet - Answer -A toilet-like plumbing fixture designed to
promote posterior hygiene; not a toilet.
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