Florida Journeyman Plumber Licensing Exam
Test Questions And Correct Answers (Verified
Answers) Plus Rationales 2025/2026 Q&A |
Instant Download Pdf
1. What is the minimum burial depth for water service piping in Florida?
12 inches
Florida Plumbing Code requires a minimum of 12 inches to protect against
physical damage and freezing in the state’s climate.
2. Which type of joint is commonly used to connect copper tubing?
Sweat (soldered) joint
Sweating creates a leak-proof, permanent connection by using solder and
heat.
3. What is the minimum slope for horizontal drainage piping?
1/4 inch per foot
This slope ensures proper gravity flow and prevents standing water in the
pipe.
4. The maximum spacing between supports for 1-inch copper tubing is:
8 feet
Copper tubing needs adequate support to prevent sagging and joint
stress.
,5. What is the approved method for testing drainage systems in Florida?
Water test or air test
Both methods are acceptable under code for ensuring leak-free drainage
systems.
6. The minimum size for a building sewer in Florida is:
4 inches
A 4-inch minimum ensures adequate flow capacity for typical residential
and commercial systems.
7. Which material is prohibited for water distribution piping in Florida?
Lead pipe
Lead is banned due to toxicity and health hazards.
8. What is the required trap seal depth for plumbing fixtures?
2 to 4 inches
This range prevents sewer gases from entering while maintaining water
seal integrity.
9. Which valve type is typically installed at the water service entrance?
Full-open stop valve
This allows for complete shutoff of the water supply for maintenance or
emergencies.
10.The maximum allowable distance between a fixture trap and its vent is
called the:
Trap arm length
Trap arm length is regulated to maintain proper venting and prevent
siphoning.
,11.What is the minimum vent pipe diameter for a toilet?
2 inches
A 2-inch vent prevents pressure fluctuations that could siphon the trap.
12.Which code governs plumbing installation in Florida?
Florida Building Code – Plumbing
Florida adopts its own version of the International Plumbing Code with
state amendments.
13.What is the maximum fixture unit load on a 2-inch horizontal drain?
8 fixture units
The fixture unit table in the code specifies limits to prevent overloading.
14.Which backflow prevention device is used for a hose bibb?
Vacuum breaker
Vacuum breakers prevent contaminated water from being siphoned back
into the potable system.
15.What is the maximum allowable pressure for water distribution systems in
Florida without a pressure-reducing valve?
80 psi
Excess pressure can damage fixtures and cause leaks.
16.What is the minimum diameter for a residential water service line?
3/4 inch
Ensures adequate flow and pressure for household use.
17.The minimum clearance in front of a water closet is:
21 inches
Adequate clearance is required for comfort and accessibility.
, 18.Which type of fitting should be used to change direction in drainage piping?
Long sweep elbow
Long sweeps maintain flow and reduce the chance of blockages.
19.The term “wet venting” refers to:
Using a drain pipe also as a vent
This method is allowed in certain conditions to reduce piping.
20.What is the minimum size cleanout required for a 4-inch drain?
4 inches
Cleanout size must match the pipe size for proper maintenance access.
21.Which method is approved for joining PVC drainage pipes?
Solvent cementing
Solvent welding creates a permanent, leak-proof bond.
22.What is the maximum developed length of a trap arm for a 1 1/4-inch pipe?
2 feet 6 inches
Beyond this length, the trap could lose its seal due to siphonage.
23.Which type of pipe is most commonly used for natural gas distribution?
Black steel
Black steel pipe is strong and suitable for gas service.
24.The minimum slope for a 4-inch building sewer is:
1/8 inch per foot
Large diameter pipes need less slope to maintain adequate flow.
Test Questions And Correct Answers (Verified
Answers) Plus Rationales 2025/2026 Q&A |
Instant Download Pdf
1. What is the minimum burial depth for water service piping in Florida?
12 inches
Florida Plumbing Code requires a minimum of 12 inches to protect against
physical damage and freezing in the state’s climate.
2. Which type of joint is commonly used to connect copper tubing?
Sweat (soldered) joint
Sweating creates a leak-proof, permanent connection by using solder and
heat.
3. What is the minimum slope for horizontal drainage piping?
1/4 inch per foot
This slope ensures proper gravity flow and prevents standing water in the
pipe.
4. The maximum spacing between supports for 1-inch copper tubing is:
8 feet
Copper tubing needs adequate support to prevent sagging and joint
stress.
,5. What is the approved method for testing drainage systems in Florida?
Water test or air test
Both methods are acceptable under code for ensuring leak-free drainage
systems.
6. The minimum size for a building sewer in Florida is:
4 inches
A 4-inch minimum ensures adequate flow capacity for typical residential
and commercial systems.
7. Which material is prohibited for water distribution piping in Florida?
Lead pipe
Lead is banned due to toxicity and health hazards.
8. What is the required trap seal depth for plumbing fixtures?
2 to 4 inches
This range prevents sewer gases from entering while maintaining water
seal integrity.
9. Which valve type is typically installed at the water service entrance?
Full-open stop valve
This allows for complete shutoff of the water supply for maintenance or
emergencies.
10.The maximum allowable distance between a fixture trap and its vent is
called the:
Trap arm length
Trap arm length is regulated to maintain proper venting and prevent
siphoning.
,11.What is the minimum vent pipe diameter for a toilet?
2 inches
A 2-inch vent prevents pressure fluctuations that could siphon the trap.
12.Which code governs plumbing installation in Florida?
Florida Building Code – Plumbing
Florida adopts its own version of the International Plumbing Code with
state amendments.
13.What is the maximum fixture unit load on a 2-inch horizontal drain?
8 fixture units
The fixture unit table in the code specifies limits to prevent overloading.
14.Which backflow prevention device is used for a hose bibb?
Vacuum breaker
Vacuum breakers prevent contaminated water from being siphoned back
into the potable system.
15.What is the maximum allowable pressure for water distribution systems in
Florida without a pressure-reducing valve?
80 psi
Excess pressure can damage fixtures and cause leaks.
16.What is the minimum diameter for a residential water service line?
3/4 inch
Ensures adequate flow and pressure for household use.
17.The minimum clearance in front of a water closet is:
21 inches
Adequate clearance is required for comfort and accessibility.
, 18.Which type of fitting should be used to change direction in drainage piping?
Long sweep elbow
Long sweeps maintain flow and reduce the chance of blockages.
19.The term “wet venting” refers to:
Using a drain pipe also as a vent
This method is allowed in certain conditions to reduce piping.
20.What is the minimum size cleanout required for a 4-inch drain?
4 inches
Cleanout size must match the pipe size for proper maintenance access.
21.Which method is approved for joining PVC drainage pipes?
Solvent cementing
Solvent welding creates a permanent, leak-proof bond.
22.What is the maximum developed length of a trap arm for a 1 1/4-inch pipe?
2 feet 6 inches
Beyond this length, the trap could lose its seal due to siphonage.
23.Which type of pipe is most commonly used for natural gas distribution?
Black steel
Black steel pipe is strong and suitable for gas service.
24.The minimum slope for a 4-inch building sewer is:
1/8 inch per foot
Large diameter pipes need less slope to maintain adequate flow.
