INTERNACHI RESIDENTIAL PLUMBING
OVERVIEW EXAM
What are the four defects of plumbing? - Correct Answers -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. -
Correct Answers -False
"Plumbing" comes from the Latin word "plumbum," which means ___________. -
Correct Answers -lead
T/F: Contamination can affect water's potability. - Correct Answers -True
According to the InterNACHI Standards of Practice, the inspector is required to _______
all the toilets. - Correct Answers –flush
T/F: Solvent-cementing joints between different types of plastic is not allowed because
the chemical composition of the joint will not be reliable. - Correct Answers -True
An access opening of at least _________ should be installed if a pump at a whirlpool
bathtub is located more than 2 feet away from it. - Correct Answers -18x18 inches
What does ABS stand for? - Correct Answers -acrylonitrile butadiene styrene
Unless the bottom exposed edge of the glass is 60 inches or more above the
tub/shower floor surface, an ______________ window at a wall must be of safety
glazing. - Correct Answers -exterior
According to the InterNACHI Home Inspection Standards of Practice, the inspector
________ required to flush all of the toilets. - Correct Answers -is
Fixture traps should have a liquid seal of at least ______ and, at most, 4 inches, except
in the case of specially-designed fixtures. - Correct Answers -2 inches
A clothes washer standpipe should have a __________ height above the trap of 18
inches. - Correct Answers -minimum
,T/F: The inspector is required to light or ignite pilot lights. - Correct Answers -False
If a home inspector observes a fuel storage tank, the inspector _____ describe that in
the report. - Correct Answers -must
Define ABS (acrylonitrile butadiene styrene): - Correct Answers -Rigid black plastic pipe
used for drain, waste and vent lines.
Define access cover - Correct Answers -Removable plate that permits access to a pipe
or pipe fitting for the purpose of inspection, maintenance, repair or replacement.
Define access panel - Correct Answers -An opening in the wall or ceiling near a fixture
that allows access for servicing the plumbing/electrical system.
Define accessible: - Correct Answers -In the opinion of the inspector, can be
approached or entered safely without difficulty, fear or danger.
Define activate - Correct Answers -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 - Correct Answers -A fitting that unites different types of pipe together,
such as ABS to cast-iron pipe.
Define aerator - Correct Answers -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 - Correct Answers -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 - Correct Answers -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) - Correct Answers -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) - Correct Answers -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 - Correct Answers -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 - Correct Answers -A device that prevents wastewater from being
drawn back into supply lines and possibly contaminating the water supply.
Define aperture - Correct Answers -An opening in a pipe.
Define appliance - Correct Answers -An apparatus, device, or equipment operated by
use of electricity or fuel gas to produce heat, light, power, refrigeration, or air
conditioning.
Define approved - Correct Answers -Accepted by the code official, third-party agency,
authority having jurisdiction (AHJ), or conforming to a standard such as ANSI.
Define back-pressure - Correct Answers -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 - Correct Answers -The backflow of water caused by system
pressure falling below atmospheric pressure. Atmospheric pressure supplies the force
that reverses the flow.
Define backflow - Correct Answers -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 - Correct Answers -A device or means to prevent backflow
into the potable water supply.
Define basket strainer - Correct Answers -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 - Correct Answers -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 - Correct Answers -A toilet-like plumbing fixture designed to promote
posterior hygiene; not a toilet.
Define building drain - Correct Answers -The part of the drainage system that receives
the discharge from inside the dwelling and transports it to the building's sewer, and ends
30 inches outside the dwelling's foundation wall.
OVERVIEW EXAM
What are the four defects of plumbing? - Correct Answers -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. -
Correct Answers -False
"Plumbing" comes from the Latin word "plumbum," which means ___________. -
Correct Answers -lead
T/F: Contamination can affect water's potability. - Correct Answers -True
According to the InterNACHI Standards of Practice, the inspector is required to _______
all the toilets. - Correct Answers –flush
T/F: Solvent-cementing joints between different types of plastic is not allowed because
the chemical composition of the joint will not be reliable. - Correct Answers -True
An access opening of at least _________ should be installed if a pump at a whirlpool
bathtub is located more than 2 feet away from it. - Correct Answers -18x18 inches
What does ABS stand for? - Correct Answers -acrylonitrile butadiene styrene
Unless the bottom exposed edge of the glass is 60 inches or more above the
tub/shower floor surface, an ______________ window at a wall must be of safety
glazing. - Correct Answers -exterior
According to the InterNACHI Home Inspection Standards of Practice, the inspector
________ required to flush all of the toilets. - Correct Answers -is
Fixture traps should have a liquid seal of at least ______ and, at most, 4 inches, except
in the case of specially-designed fixtures. - Correct Answers -2 inches
A clothes washer standpipe should have a __________ height above the trap of 18
inches. - Correct Answers -minimum
,T/F: The inspector is required to light or ignite pilot lights. - Correct Answers -False
If a home inspector observes a fuel storage tank, the inspector _____ describe that in
the report. - Correct Answers -must
Define ABS (acrylonitrile butadiene styrene): - Correct Answers -Rigid black plastic pipe
used for drain, waste and vent lines.
Define access cover - Correct Answers -Removable plate that permits access to a pipe
or pipe fitting for the purpose of inspection, maintenance, repair or replacement.
Define access panel - Correct Answers -An opening in the wall or ceiling near a fixture
that allows access for servicing the plumbing/electrical system.
Define accessible: - Correct Answers -In the opinion of the inspector, can be
approached or entered safely without difficulty, fear or danger.
Define activate - Correct Answers -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 - Correct Answers -A fitting that unites different types of pipe together,
such as ABS to cast-iron pipe.
Define aerator - Correct Answers -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 - Correct Answers -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 - Correct Answers -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) - Correct Answers -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) - Correct Answers -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 - Correct Answers -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 - Correct Answers -A device that prevents wastewater from being
drawn back into supply lines and possibly contaminating the water supply.
Define aperture - Correct Answers -An opening in a pipe.
Define appliance - Correct Answers -An apparatus, device, or equipment operated by
use of electricity or fuel gas to produce heat, light, power, refrigeration, or air
conditioning.
Define approved - Correct Answers -Accepted by the code official, third-party agency,
authority having jurisdiction (AHJ), or conforming to a standard such as ANSI.
Define back-pressure - Correct Answers -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 - Correct Answers -The backflow of water caused by system
pressure falling below atmospheric pressure. Atmospheric pressure supplies the force
that reverses the flow.
Define backflow - Correct Answers -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 - Correct Answers -A device or means to prevent backflow
into the potable water supply.
Define basket strainer - Correct Answers -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 - Correct Answers -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 - Correct Answers -A toilet-like plumbing fixture designed to promote
posterior hygiene; not a toilet.
Define building drain - Correct Answers -The part of the drainage system that receives
the discharge from inside the dwelling and transports it to the building's sewer, and ends
30 inches outside the dwelling's foundation wall.
