Plumbing Red Seal Questions &
Answers Graded A+ 2025 Update
A fixture drain of the individual fixture that is not piped through one complete storey is
referred to as a: - ✔️✔️fixture drain.
An air conditioner that discharges 0.05 L/s of condensate into a floor drain, would
equate to how many fixture units? - ✔️✔️2
The main function of a low water cut-off (LWCO) on a boiler is to - ✔️✔️prevent the
main burner from firing if water levels are low
The maximum filling density of any propane container must never exceed ____% of the
water capacity stamped on the container - ✔️✔️42
The most common physical characteristics used to measure the quality of water are:
temperature, taste, colour, _________ and odour - ✔️✔️turbidity
If a wood range is to be converted to a gas range certain adjustments must be made.
One major adjustment is the: - ✔️✔️replacement of manual dampers with barometric
dampers
When using grooved pipe from one manufacturer, the fittings from another manufacturer
may be used. - ✔️✔️False
A settlement loop is installed in water distribution lines that are ______ inches or less -
✔️✔️2
Which of the following must the base of every soil or waste stack contain -
✔️✔️cleanout and expansion joint
An oil interceptor would most likely be found in a/an: - ✔️✔️dry cleaning plant.
A water purveyor has the primary responsibility of: - ✔️✔️providing the public with a
safe and potable water supply.
A one inch water service to a building may have a _____ valve as the shut-off valve for
the building. - ✔️✔️stop-and-drain
, After the inspection of a hot water heating system shows that the system pressure is in
excess of the designed operating pressure. Which device will cause this problem? -
✔️✔️Water-feed valve.
The state in which matter exists can be influence by these two factors: -
✔️✔️temperature and pressure
If the zone valve drive motor fails to operate the plumber must: - ✔️✔️replace the
defective motor.
A 120 Volt hot surface igniter can reach temperatures up to ____F - ✔️✔️2600
Which of the following best describes an electric water heater? - ✔️✔️one with an
immersion type element
A trap arm that does not use siphonic action may change direction in a horizontal plane
by up to ____ degrees between the fixture and the vent fitting - ✔️✔️135
The suction pipe from the well to the house should be installed at a/an _______ slope -
✔️✔️upward
1. When installing a private water supply system, a qualified __________ should
complete all wiring terminations - ✔️✔️electrician
When an eye is properly formed in a wire rope with the use of a thimble, the eye will
have approximately ______ percent - ✔️✔️80
Fixtures that are not part of a wet vent group may connect to the wet vent branch and
the hydraulic load going into the vent does not have to be included in the wet vent -
✔️✔️False
When calculating the fixture unit load of a residence a two inch main floor drain is
considered to be ____ fixture units. - ✔️✔️2
The common name for sodium carbonate is _________. - ✔️✔️soda ash
When a series of water treatment devices are required for a water treatment system the
water softener is always located _________ in the series. - ✔️✔️Last
Which of the following will have the lowest supply pressure - ✔️✔️manufactured gas
Which table should be consulted to determine cleanout size and spacing - ✔️✔️4.7.2
Answers Graded A+ 2025 Update
A fixture drain of the individual fixture that is not piped through one complete storey is
referred to as a: - ✔️✔️fixture drain.
An air conditioner that discharges 0.05 L/s of condensate into a floor drain, would
equate to how many fixture units? - ✔️✔️2
The main function of a low water cut-off (LWCO) on a boiler is to - ✔️✔️prevent the
main burner from firing if water levels are low
The maximum filling density of any propane container must never exceed ____% of the
water capacity stamped on the container - ✔️✔️42
The most common physical characteristics used to measure the quality of water are:
temperature, taste, colour, _________ and odour - ✔️✔️turbidity
If a wood range is to be converted to a gas range certain adjustments must be made.
One major adjustment is the: - ✔️✔️replacement of manual dampers with barometric
dampers
When using grooved pipe from one manufacturer, the fittings from another manufacturer
may be used. - ✔️✔️False
A settlement loop is installed in water distribution lines that are ______ inches or less -
✔️✔️2
Which of the following must the base of every soil or waste stack contain -
✔️✔️cleanout and expansion joint
An oil interceptor would most likely be found in a/an: - ✔️✔️dry cleaning plant.
A water purveyor has the primary responsibility of: - ✔️✔️providing the public with a
safe and potable water supply.
A one inch water service to a building may have a _____ valve as the shut-off valve for
the building. - ✔️✔️stop-and-drain
, After the inspection of a hot water heating system shows that the system pressure is in
excess of the designed operating pressure. Which device will cause this problem? -
✔️✔️Water-feed valve.
The state in which matter exists can be influence by these two factors: -
✔️✔️temperature and pressure
If the zone valve drive motor fails to operate the plumber must: - ✔️✔️replace the
defective motor.
A 120 Volt hot surface igniter can reach temperatures up to ____F - ✔️✔️2600
Which of the following best describes an electric water heater? - ✔️✔️one with an
immersion type element
A trap arm that does not use siphonic action may change direction in a horizontal plane
by up to ____ degrees between the fixture and the vent fitting - ✔️✔️135
The suction pipe from the well to the house should be installed at a/an _______ slope -
✔️✔️upward
1. When installing a private water supply system, a qualified __________ should
complete all wiring terminations - ✔️✔️electrician
When an eye is properly formed in a wire rope with the use of a thimble, the eye will
have approximately ______ percent - ✔️✔️80
Fixtures that are not part of a wet vent group may connect to the wet vent branch and
the hydraulic load going into the vent does not have to be included in the wet vent -
✔️✔️False
When calculating the fixture unit load of a residence a two inch main floor drain is
considered to be ____ fixture units. - ✔️✔️2
The common name for sodium carbonate is _________. - ✔️✔️soda ash
When a series of water treatment devices are required for a water treatment system the
water softener is always located _________ in the series. - ✔️✔️Last
Which of the following will have the lowest supply pressure - ✔️✔️manufactured gas
Which table should be consulted to determine cleanout size and spacing - ✔️✔️4.7.2
