Texas Journeyman Plumber Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A journeyman plumber in Texas is reviewing the requirements for
obtaining a permit before beginning work on a commercial remodeling
project involving replacement of water supply piping, installation of
additional fixtures, and relocation of a sewer line inside an occupied
office building. According to standard plumbing code enforcement
procedures and Texas licensing practices, which of the following
statements best describes the proper permitting responsibility and
compliance requirement before work begins?
A. The journeyman plumber may begin work immediately if supervised by
another licensed plumber and obtain the permit after the rough-in
inspection
B. The property owner alone is responsible for securing permits regardless
,of who performs the work
C. The plumbing contractor or responsible master plumber must obtain the
proper permit before installation begins, and all work must comply with
applicable plumbing codes and inspections
D. A permit is unnecessary because the work occurs within an existing
commercial structure
Rationale: Texas plumbing regulations generally require permits before
plumbing work begins on commercial projects. The responsible master
plumber or licensed contractor must ensure compliance with adopted
plumbing codes, inspections, and permitting procedures before installation
activities commence.
2. During installation of a building drain beneath a slab-on-grade
foundation, a journeyman plumber must ensure the drainage piping
maintains proper slope for efficient waste removal and prevention of
solids accumulation. Which minimum slope is generally required for
horizontal drainage piping measuring 3 inches in diameter under
standard plumbing code provisions?
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/2 inch per foot
D. 1 inch per foot
,Rationale: Plumbing codes commonly require 3-inch and larger horizontal
drainage piping to maintain a minimum slope of 1/8 inch per foot to
provide proper drainage velocity while avoiding excessive water
separation from solids.
3. A plumber is troubleshooting a residential hot water system where
occupants complain of fluctuating water temperatures whenever
multiple fixtures operate simultaneously. After confirming the water
heater is functioning correctly, the plumber determines the issue
results from pressure imbalance between hot and cold water supplies.
Which plumbing device would best help stabilize outlet temperature
and reduce scalding risk?
A. Pressure vacuum breaker
B. Double-check backflow preventer
C. Thermostatic mixing valve
D. Dielectric union
Rationale: Thermostatic mixing valves automatically balance hot and cold
water to maintain consistent outlet temperatures, improving comfort and
reducing scalding hazards when supply pressures fluctuate.
4. A journeyman plumber is installing copper tubing in a potable water
distribution system. To prevent contamination of drinking water and
, ensure safe operation, which solder material is acceptable for joining
copper pipe in potable water applications?
A. 50/50 tin-lead solder
B. Lead-based acid-core solder
C. Silver-bearing solder containing high lead content
D. Lead-free solder approved for potable water systems
Rationale: Modern plumbing codes require lead-free solder for potable
water systems to protect public health and prevent lead contamination in
drinking water supplies.
5. A plumbing inspector observes that a newly installed trap arm serving
a lavatory extends an excessive distance before connecting to a vent
stack. What is the most likely consequence of an improperly vented
trap arm exceeding allowable developed length?
A. Increased fixture flow capacity
B. Elimination of trap seal evaporation
C. Trap siphonage and possible sewer gas entry into the building
D. Improved waste transport efficiency
Rationale: Excessive trap arm length without proper venting can create
siphonage conditions that remove the water seal from the trap, allowing
sewer gases to enter occupied spaces.
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A journeyman plumber in Texas is reviewing the requirements for
obtaining a permit before beginning work on a commercial remodeling
project involving replacement of water supply piping, installation of
additional fixtures, and relocation of a sewer line inside an occupied
office building. According to standard plumbing code enforcement
procedures and Texas licensing practices, which of the following
statements best describes the proper permitting responsibility and
compliance requirement before work begins?
A. The journeyman plumber may begin work immediately if supervised by
another licensed plumber and obtain the permit after the rough-in
inspection
B. The property owner alone is responsible for securing permits regardless
,of who performs the work
C. The plumbing contractor or responsible master plumber must obtain the
proper permit before installation begins, and all work must comply with
applicable plumbing codes and inspections
D. A permit is unnecessary because the work occurs within an existing
commercial structure
Rationale: Texas plumbing regulations generally require permits before
plumbing work begins on commercial projects. The responsible master
plumber or licensed contractor must ensure compliance with adopted
plumbing codes, inspections, and permitting procedures before installation
activities commence.
2. During installation of a building drain beneath a slab-on-grade
foundation, a journeyman plumber must ensure the drainage piping
maintains proper slope for efficient waste removal and prevention of
solids accumulation. Which minimum slope is generally required for
horizontal drainage piping measuring 3 inches in diameter under
standard plumbing code provisions?
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/2 inch per foot
D. 1 inch per foot
,Rationale: Plumbing codes commonly require 3-inch and larger horizontal
drainage piping to maintain a minimum slope of 1/8 inch per foot to
provide proper drainage velocity while avoiding excessive water
separation from solids.
3. A plumber is troubleshooting a residential hot water system where
occupants complain of fluctuating water temperatures whenever
multiple fixtures operate simultaneously. After confirming the water
heater is functioning correctly, the plumber determines the issue
results from pressure imbalance between hot and cold water supplies.
Which plumbing device would best help stabilize outlet temperature
and reduce scalding risk?
A. Pressure vacuum breaker
B. Double-check backflow preventer
C. Thermostatic mixing valve
D. Dielectric union
Rationale: Thermostatic mixing valves automatically balance hot and cold
water to maintain consistent outlet temperatures, improving comfort and
reducing scalding hazards when supply pressures fluctuate.
4. A journeyman plumber is installing copper tubing in a potable water
distribution system. To prevent contamination of drinking water and
, ensure safe operation, which solder material is acceptable for joining
copper pipe in potable water applications?
A. 50/50 tin-lead solder
B. Lead-based acid-core solder
C. Silver-bearing solder containing high lead content
D. Lead-free solder approved for potable water systems
Rationale: Modern plumbing codes require lead-free solder for potable
water systems to protect public health and prevent lead contamination in
drinking water supplies.
5. A plumbing inspector observes that a newly installed trap arm serving
a lavatory extends an excessive distance before connecting to a vent
stack. What is the most likely consequence of an improperly vented
trap arm exceeding allowable developed length?
A. Increased fixture flow capacity
B. Elimination of trap seal evaporation
C. Trap siphonage and possible sewer gas entry into the building
D. Improved waste transport efficiency
Rationale: Excessive trap arm length without proper venting can create
siphonage conditions that remove the water seal from the trap, allowing
sewer gases to enter occupied spaces.
