Florida Plumbing Contractor Licensing Exam Test
Questions And Correct Answers (Verified Answers)
Plus Rationales 2025/2026 Q&A | Instant
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1. The minimum slope for a 4-inch building sewer pipe is:
a) 1/8 inch per foot
b) 1/4 inch per foot
c) 3/8 inch per foot
d) 1/2 inch per foot
The Florida Plumbing Code specifies a minimum slope of 1/4 inch per foot
for a 4-inch building sewer to ensure proper drainage and avoid
blockages.
2. The maximum horizontal spacing between supports for 2-inch copper
tubing is:
a) 4 feet
b) 6 feet
c) 8 feet
d) 10 feet
According to code, 2-inch copper tubing must be supported at intervals
not exceeding 6 feet to prevent sagging and joint stress.
,3. The device used to prevent backflow due to back-siphonage in a potable
water system is called:
a) Check valve
b) Vacuum breaker
c) Pressure regulator
d) Air chamber
A vacuum breaker prevents back-siphonage by introducing air into the
system when negative pressure occurs.
4. In Florida, the minimum burial depth for water service piping is:
a) 6 inches
b) 12 inches
c) 18 inches
d) 12 inches below frost line
Florida Plumbing Code requires water service piping to be buried at least
12 inches below the frost line or per local frost depth requirements.
5. A plumbing vent that serves multiple fixtures on the same floor is known as
a:
a) Individual vent
b) Common vent
c) Circuit vent
d) Loop vent
A circuit vent serves two or more traps or trapped fixtures on the same
floor level.
,6. The maximum allowable distance from a trap to its vent for a 2-inch drain
is:
a) 3 feet
b) 5 feet
c) 8 feet
d) 10 feet
The Florida Plumbing Code specifies a maximum trap-to-vent distance of 5
feet for a 2-inch drain to prevent trap siphonage.
7. The fitting used to connect the ends of two pipes of the same diameter in a
straight line is:
a) Elbow
b) Tee
c) Coupling
d) Union
A coupling is a short fitting used to join two pieces of pipe in a straight
run.
8. The type of drawing that shows the plumbing layout from above is called:
a) Isometric drawing
b) Plan view
c) Elevation view
d) Detail drawing
A plan view is a top-down representation used to show layout and
location of plumbing fixtures and piping.
, 9. Which type of piping material is most commonly used for natural gas
distribution inside buildings in Florida?
a) PVC
b) Black steel
c) Copper
d) CPVC
Black steel pipe is the standard material for natural gas distribution inside
buildings.
10.The minimum size trap for a bathtub is:
a) 1 1/4 inches
b) 1 1/2 inches
c) 2 inches
d) 2 1/2 inches
Florida Plumbing Code requires a 1 1/2-inch trap for bathtubs to handle
the flow rate adequately.
11.The primary purpose of a plumbing trap is to:
a) Provide a water seal to prevent sewer gases from entering the building
b) Increase water flow velocity
c) Filter debris from wastewater
d) Provide a water seal to prevent sewer gases from entering the building
Traps create a water barrier that stops sewer gases from backing up into
occupied spaces.
Questions And Correct Answers (Verified Answers)
Plus Rationales 2025/2026 Q&A | Instant
Download Pdf
1. The minimum slope for a 4-inch building sewer pipe is:
a) 1/8 inch per foot
b) 1/4 inch per foot
c) 3/8 inch per foot
d) 1/2 inch per foot
The Florida Plumbing Code specifies a minimum slope of 1/4 inch per foot
for a 4-inch building sewer to ensure proper drainage and avoid
blockages.
2. The maximum horizontal spacing between supports for 2-inch copper
tubing is:
a) 4 feet
b) 6 feet
c) 8 feet
d) 10 feet
According to code, 2-inch copper tubing must be supported at intervals
not exceeding 6 feet to prevent sagging and joint stress.
,3. The device used to prevent backflow due to back-siphonage in a potable
water system is called:
a) Check valve
b) Vacuum breaker
c) Pressure regulator
d) Air chamber
A vacuum breaker prevents back-siphonage by introducing air into the
system when negative pressure occurs.
4. In Florida, the minimum burial depth for water service piping is:
a) 6 inches
b) 12 inches
c) 18 inches
d) 12 inches below frost line
Florida Plumbing Code requires water service piping to be buried at least
12 inches below the frost line or per local frost depth requirements.
5. A plumbing vent that serves multiple fixtures on the same floor is known as
a:
a) Individual vent
b) Common vent
c) Circuit vent
d) Loop vent
A circuit vent serves two or more traps or trapped fixtures on the same
floor level.
,6. The maximum allowable distance from a trap to its vent for a 2-inch drain
is:
a) 3 feet
b) 5 feet
c) 8 feet
d) 10 feet
The Florida Plumbing Code specifies a maximum trap-to-vent distance of 5
feet for a 2-inch drain to prevent trap siphonage.
7. The fitting used to connect the ends of two pipes of the same diameter in a
straight line is:
a) Elbow
b) Tee
c) Coupling
d) Union
A coupling is a short fitting used to join two pieces of pipe in a straight
run.
8. The type of drawing that shows the plumbing layout from above is called:
a) Isometric drawing
b) Plan view
c) Elevation view
d) Detail drawing
A plan view is a top-down representation used to show layout and
location of plumbing fixtures and piping.
, 9. Which type of piping material is most commonly used for natural gas
distribution inside buildings in Florida?
a) PVC
b) Black steel
c) Copper
d) CPVC
Black steel pipe is the standard material for natural gas distribution inside
buildings.
10.The minimum size trap for a bathtub is:
a) 1 1/4 inches
b) 1 1/2 inches
c) 2 inches
d) 2 1/2 inches
Florida Plumbing Code requires a 1 1/2-inch trap for bathtubs to handle
the flow rate adequately.
11.The primary purpose of a plumbing trap is to:
a) Provide a water seal to prevent sewer gases from entering the building
b) Increase water flow velocity
c) Filter debris from wastewater
d) Provide a water seal to prevent sewer gases from entering the building
Traps create a water barrier that stops sewer gases from backing up into
occupied spaces.
