IRC Plumbing Practice Test|Complete Questions with
A+ Graded Answers
What is the minimum size of a water meter and service piping in inches for a water supply system of
34 fixture units with a maximum developed length of 200 feet. The water pressure of the system is 35
psi.
1
Table AP201.1
What is the minimum sized trap that can be used for the drainage system of a bathtub (with or
without shower head and/or whirlpool attachments)?
1.5
Table P3201.7
A water heater pan drain must extend full-size and terminate over a suitably located indirect waste
receptor or must extend to the exterior of the building and terminate not less than _____ inches and
not more than _____ inches above the adjacent ground surface.
6, 24
P2801.6.2
A laundry tray waste line is permitted to connect into a standpipe for automatic clothes washer drain.
The standpipe must extend not less than _____ above the trap weir and must extend above the flood
level rim of the laundry tray.
30 inches (762 mm)
P2706.1.2.1
Clothes closets, linen closets and pantries not exceeding _____ in area, with the smallest dimension
not greater than 3 feet (915 mm) and having wall and ceiling surfaces of gypsum board will not
require fire sprinklers.
24 square feet (2.2 m2)
P2904.1.1
If a water closet can be removed to provide cleanout access, does that fulfill the cleanout
requirement of the code?
No
P3005.2.3
Appliances and equipment used for heating water or storing hot water have to be protected by
_____.
pressure-relief valve and temperature-relief valve or a combination pressure and temperature-relief
valve.
P2804.1
,Where the fixture drains connect at different levels, the common vent must connect as a _____
extension of the _____ drain.
vertical, vertical
P3107.3
The minimum air gap distance in inches for lavatories and other fixtures with effective opening not
greater than 1/2 inch in diameter that are close to a wall is:
1.5
Table P2902.3.1
In areas prone to flooding as established by the code, water supply systems must be designed and
constructed to prevent _____ of floodwaters.
infiltration
P2602.2
When either a public water-supply or sewer system, or both, are not available, _____, an individual
water-supply or individual sewage-disposal system, or both, must be provided.
or connection thereto is not feasible
P2602.1
_____ installed in a bathroom are not required to be installed within an enclosure.
direct-vent water heaters
M2005.2
For water supply systems used predominantly for flush tanks having a water supply fixture unit load
of 12, what is the comparable demand in gallons per minute.
16.0
Table P2903.6(1)
Test equipment, materials and labor must be furnished by the ______
permittee
P2503.3
The minimum size in inches of a combination waste and vent pipe connecting to a building drain or
building sub drain and serving 31 d.f.u. is _____.
3
Table 3111.3
The outlet of a water heaters pressure relief valve, temperature relief valve or combination valve,
must be directly connected to the _____.
,none of the above
P2804.6.1
What is the minimum pipe support spacing in feet, required for copper or copper alloy tubing (1 1/4
inch diameter and smaller_ installed in a horizontal orientation.
6
Table P2605.1
The flow velocity of the water distribution system must be controlled to reduce the possibility of
_____.
water hammer
P2903.5
A wet 2 inch vent can handle venting for _____ fixture unit loads.
4
Table P3108.3
There must be at least _____ inches clearance in front of the water closet, bidet or lavatory to any
wall, fixture or door.
21
P2705.1
Open hub waste receptors must be permitted in the form of a hub or pipe extending not less than
_____ inch(es) above a water impervious floor, and are not required to have a strainer.
1
P2706.1
The minimum air gap distance in inches for sink, laundry trays, gooseneck back faucets and other
fixtures with effective openings not greater than 3/4 inch in diameter that are away from a wall is:
1.5
Table P2902.3.1
Where the drainage piping has been roughed-in for future fixtures, a rough-in connection for a vent
must be installed a minimum of _____.
one-half times the diameter of the drain
P3104.6
Grinder pumps or grinder ejectors that receive the discharge of water closets must have a minimum
discharge opening of _____.
1 1/4 inches (32 mm)
, P3007.6
The minimum air gap distance in inches for over-rim bath fillers and other fixtures with effective
openings not greater than 1 inch in diameter that are away from a wall is:
2
Table P2902.3.1
What is the minimum size of a water meter and service piping in inches for a water supply system of
21 fixture units with a maximum developed length of 500 feet. The water pressure of the system is 48
psi.
1.5
Table AP 201.1
A _____ strainer or basket must cover the waste outlet of waste receptors.
removable
P2706.1
Joints in plastic piping must be made with approved fittings by ______.
1. solvent cementing; or
2. heat fusion; or
3. corrosion-resistant metal clamps with insert fittings or compression connections
P2906.9
For a fire sprinkler system the service line is a 3/4" pipe 78 feet in length. The required flow rate at
the sprinklers is 12 gpm. Determine the pressure loss in pound per square inch (psi), in the water
service pipe based on the selected size of the water service.
24.9
Table P2904.6.2(1)
Joints and connections in the plumbing system must be ______ for the intended use or required test
pressure.
gas tight and water tight
P2906.8
What is the minimum size of distribution piping in inches for a water supply system of 80 fixture units
with a maximum developed length of 150 feet. The water pressure of the system is 70 psi.
1.25
Table AP201.1
A sink and dishwasher are permitted to discharge through a single _____ inch trap.
1.5
A+ Graded Answers
What is the minimum size of a water meter and service piping in inches for a water supply system of
34 fixture units with a maximum developed length of 200 feet. The water pressure of the system is 35
psi.
1
Table AP201.1
What is the minimum sized trap that can be used for the drainage system of a bathtub (with or
without shower head and/or whirlpool attachments)?
1.5
Table P3201.7
A water heater pan drain must extend full-size and terminate over a suitably located indirect waste
receptor or must extend to the exterior of the building and terminate not less than _____ inches and
not more than _____ inches above the adjacent ground surface.
6, 24
P2801.6.2
A laundry tray waste line is permitted to connect into a standpipe for automatic clothes washer drain.
The standpipe must extend not less than _____ above the trap weir and must extend above the flood
level rim of the laundry tray.
30 inches (762 mm)
P2706.1.2.1
Clothes closets, linen closets and pantries not exceeding _____ in area, with the smallest dimension
not greater than 3 feet (915 mm) and having wall and ceiling surfaces of gypsum board will not
require fire sprinklers.
24 square feet (2.2 m2)
P2904.1.1
If a water closet can be removed to provide cleanout access, does that fulfill the cleanout
requirement of the code?
No
P3005.2.3
Appliances and equipment used for heating water or storing hot water have to be protected by
_____.
pressure-relief valve and temperature-relief valve or a combination pressure and temperature-relief
valve.
P2804.1
,Where the fixture drains connect at different levels, the common vent must connect as a _____
extension of the _____ drain.
vertical, vertical
P3107.3
The minimum air gap distance in inches for lavatories and other fixtures with effective opening not
greater than 1/2 inch in diameter that are close to a wall is:
1.5
Table P2902.3.1
In areas prone to flooding as established by the code, water supply systems must be designed and
constructed to prevent _____ of floodwaters.
infiltration
P2602.2
When either a public water-supply or sewer system, or both, are not available, _____, an individual
water-supply or individual sewage-disposal system, or both, must be provided.
or connection thereto is not feasible
P2602.1
_____ installed in a bathroom are not required to be installed within an enclosure.
direct-vent water heaters
M2005.2
For water supply systems used predominantly for flush tanks having a water supply fixture unit load
of 12, what is the comparable demand in gallons per minute.
16.0
Table P2903.6(1)
Test equipment, materials and labor must be furnished by the ______
permittee
P2503.3
The minimum size in inches of a combination waste and vent pipe connecting to a building drain or
building sub drain and serving 31 d.f.u. is _____.
3
Table 3111.3
The outlet of a water heaters pressure relief valve, temperature relief valve or combination valve,
must be directly connected to the _____.
,none of the above
P2804.6.1
What is the minimum pipe support spacing in feet, required for copper or copper alloy tubing (1 1/4
inch diameter and smaller_ installed in a horizontal orientation.
6
Table P2605.1
The flow velocity of the water distribution system must be controlled to reduce the possibility of
_____.
water hammer
P2903.5
A wet 2 inch vent can handle venting for _____ fixture unit loads.
4
Table P3108.3
There must be at least _____ inches clearance in front of the water closet, bidet or lavatory to any
wall, fixture or door.
21
P2705.1
Open hub waste receptors must be permitted in the form of a hub or pipe extending not less than
_____ inch(es) above a water impervious floor, and are not required to have a strainer.
1
P2706.1
The minimum air gap distance in inches for sink, laundry trays, gooseneck back faucets and other
fixtures with effective openings not greater than 3/4 inch in diameter that are away from a wall is:
1.5
Table P2902.3.1
Where the drainage piping has been roughed-in for future fixtures, a rough-in connection for a vent
must be installed a minimum of _____.
one-half times the diameter of the drain
P3104.6
Grinder pumps or grinder ejectors that receive the discharge of water closets must have a minimum
discharge opening of _____.
1 1/4 inches (32 mm)
, P3007.6
The minimum air gap distance in inches for over-rim bath fillers and other fixtures with effective
openings not greater than 1 inch in diameter that are away from a wall is:
2
Table P2902.3.1
What is the minimum size of a water meter and service piping in inches for a water supply system of
21 fixture units with a maximum developed length of 500 feet. The water pressure of the system is 48
psi.
1.5
Table AP 201.1
A _____ strainer or basket must cover the waste outlet of waste receptors.
removable
P2706.1
Joints in plastic piping must be made with approved fittings by ______.
1. solvent cementing; or
2. heat fusion; or
3. corrosion-resistant metal clamps with insert fittings or compression connections
P2906.9
For a fire sprinkler system the service line is a 3/4" pipe 78 feet in length. The required flow rate at
the sprinklers is 12 gpm. Determine the pressure loss in pound per square inch (psi), in the water
service pipe based on the selected size of the water service.
24.9
Table P2904.6.2(1)
Joints and connections in the plumbing system must be ______ for the intended use or required test
pressure.
gas tight and water tight
P2906.8
What is the minimum size of distribution piping in inches for a water supply system of 80 fixture units
with a maximum developed length of 150 feet. The water pressure of the system is 70 psi.
1.25
Table AP201.1
A sink and dishwasher are permitted to discharge through a single _____ inch trap.
1.5
