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These 10 free TX-TPL questions are organized by exam domain, so you can see how each part of the Texas Tradesman Plumber-Limited License Exam blueprint is tested. Reveal the answer and explanation under each question.
A Tradesman Plumber-Limited is assigned to replace a kitchen drain and reset fixtures in a duplex. The job is performed through a plumbing company under its Responsible Master Plumber, but no Journeyman Plumber is physically onsite. Which statement correctly describes the assignment?
Correct answer: C - The Tradesman may perform this residential work under the RMP's supervision
Inspection log for a one-family dwelling: the rough DWV air test started at 5 psi; after 17 minutes the gauge still reads 5 psi; no air was added and no leakage was found. How should the result be recorded?
Correct answer: A - Pass; the required pressure and minimum hold time were achieved
During wall rough-in, copper tubing passes through a bored wood stud and lies 1 inch from the stud face where drywall will be attached. Which protection should be installed before the wall is closed?
Correct answer: D - A steel shield plate at least 0.0575 inch thick
Immediately after PVC pipe is bottomed in a solvent-cemented fitting socket, it creeps back out because the installer lets go. Which assembly step was missed?
Correct answer: B - The joint was not held against push-out during its initial set
One 2.5-gpm showerhead and three 2.0-gpm body sprays can operate at the same time in a custom shower. Their combined flow is 8.5 gpm. Select the minimum compliant trap size.
Correct answer: B - 2 inches
Measurements at a newly set water closet show 13 inches from the fixture centerline to a vanity side panel and 24 inches of clear space in front. The required clearances are 15 inches to a side obstruction and 21 inches in front. What must be changed?
Correct answer: D - Only the side clearance must be increased
An inspector records four details at a storage water heater: full-size T&P discharge piping, approved relief-temperature material, continuous gravity drainage, and an open termination 4 inches above an approved floor drain. The terminal has male threads. Which detail prevents approval?
Correct answer: A - The threaded terminal
Since a pressure-reducing valve with an integral check was installed at a home's water service, cold static pressure remains 60 psi but climbs only while the tank-type water heater is heating; its correctly rated T&P valve then drips. What installation change solves the underlying problem?
Correct answer: C - Add approved thermal-expansion control on the cold-water supply
Fertilizer is injected into a lawn-irrigation line that can develop backpressure against the potable supply. Which backflow protection belongs at the potable-water connection?
Correct answer: D - A reduced-pressure-principle backflow preventer
For a second-floor shower, the design-pressure worksheet shows 68 psi available at the service under design flow, 28 feet of elevation rise, 9 psi of device losses, and a required 20 psi residual at the shower. Using 0.433 psi of elevation loss per foot, how much remains for pipe friction?
Correct answer: B - About 27 psi remains for pipe-friction loss
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