Plumbing Practice Test Questions and Answers
Study online at https://quizlet.com/_h0cl8a
1. Air break A piping arrangement in which a drain from a fixture, ap-
pliance or device discharges indirectly into another fixture,
receptacle or interceptor at a point below the flood level rim
and above the trap seal.
2. Trenches installed parallel to Shall not extend below the 90-degree bearing plane of the
footings footing or wall.
3. Exterior Water lines subject to Shall be installed not less than 18 inches below the frost line.
freezing
4. Horizontal drains within build- Shall have cleanouts provided not more than 100 feet apart.
ings
5. Fixture trap liquid seal Shall have a liquid seal of not less than 2 inches and not more
than 4 inches.
6. Hot water distribution pipe Shall have a minimum pressure rating of 60 psi @ 180 degrees
pressure rating F.
7. Individual vent A pipe installed to vent a fixture trap and that connects with the
vent system above the fixture served or terminates in the open
air.
8. Minimum hanger spacing for Shall be 10 feet.
horizontal PVC pipe
9. DFU value for a commercial au- Is 6.
tomatic clothes washer
10. DFU value for a 3 inch trap Is 3.
11. Is 2.
1/6
, Plumbing Practice Test Questions and Answers
Study online at https://quizlet.com/_h0cl8a
Minimum number of roof
drains for up to 10,000 square
feet
12. Stack vent Is the extension of a soil or waste stack above the highest
horizontal drain connected to the stack.
13. Minimum condensate pipe di- Is ¾".
ameter for up to 20 tons of re-
frigeration
14. Water closets required for R-3 Is 2.
occupancy one and two family
dwellings
15. Separate facilities in mercan- Shall not be required in which the maximum occupant load is
tile occupancies 100 or less.
16. Closest distance from the cen- Is 15 inches.
ter of a water closet to a side
wall
17. Backflow prevention methods Methods to protect potable water supply from contamination
include a double check valve, a vacuum breaker, a reduced
pressure principle backflow preventer, and a spill-proof vacu-
um breaker.
18. Minimum size for a main in a The minimum size shall not be less than 2 inches.
central vacuum system
19. Air gap requirement for indi- The air gap shall be a minimum of twice the effective opening
rect waste pipe of the indirect waste pipe.
20. The permitted trap type is a P - Trap.
2/6
Study online at https://quizlet.com/_h0cl8a
1. Air break A piping arrangement in which a drain from a fixture, ap-
pliance or device discharges indirectly into another fixture,
receptacle or interceptor at a point below the flood level rim
and above the trap seal.
2. Trenches installed parallel to Shall not extend below the 90-degree bearing plane of the
footings footing or wall.
3. Exterior Water lines subject to Shall be installed not less than 18 inches below the frost line.
freezing
4. Horizontal drains within build- Shall have cleanouts provided not more than 100 feet apart.
ings
5. Fixture trap liquid seal Shall have a liquid seal of not less than 2 inches and not more
than 4 inches.
6. Hot water distribution pipe Shall have a minimum pressure rating of 60 psi @ 180 degrees
pressure rating F.
7. Individual vent A pipe installed to vent a fixture trap and that connects with the
vent system above the fixture served or terminates in the open
air.
8. Minimum hanger spacing for Shall be 10 feet.
horizontal PVC pipe
9. DFU value for a commercial au- Is 6.
tomatic clothes washer
10. DFU value for a 3 inch trap Is 3.
11. Is 2.
1/6
, Plumbing Practice Test Questions and Answers
Study online at https://quizlet.com/_h0cl8a
Minimum number of roof
drains for up to 10,000 square
feet
12. Stack vent Is the extension of a soil or waste stack above the highest
horizontal drain connected to the stack.
13. Minimum condensate pipe di- Is ¾".
ameter for up to 20 tons of re-
frigeration
14. Water closets required for R-3 Is 2.
occupancy one and two family
dwellings
15. Separate facilities in mercan- Shall not be required in which the maximum occupant load is
tile occupancies 100 or less.
16. Closest distance from the cen- Is 15 inches.
ter of a water closet to a side
wall
17. Backflow prevention methods Methods to protect potable water supply from contamination
include a double check valve, a vacuum breaker, a reduced
pressure principle backflow preventer, and a spill-proof vacu-
um breaker.
18. Minimum size for a main in a The minimum size shall not be less than 2 inches.
central vacuum system
19. Air gap requirement for indi- The air gap shall be a minimum of twice the effective opening
rect waste pipe of the indirect waste pipe.
20. The permitted trap type is a P - Trap.
2/6
