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These 10 free KY-JP questions are organized by exam domain, so you can see how each part of the Kentucky Journeyman Plumber License Exam blueprint is tested. Reveal the answer and explanation under each question.
A licensed plumbing company's service ticket lists two tasks: repair a leaking lavatory shutoff valve and cable a blocked kitchen waste pipe. No fixture or opening will move, and no water service, house sewer, or water heater will be replaced. What is the installation-permit requirement for this visit?
Correct answer: D - Neither task requires an installation permit.
While servicing an existing sewage wet well, a worker collapses below the access opening. No retrieval line is attached. The arriving plumber has neither atmospheric-monitoring equipment nor confined-space rescue training. What must the arriving plumber do first?
Correct answer: D - Summon trained confined-space rescuers and prevent further entry.
Before backfilling beneath a new house, a plumber finds an approved crimp coupling joining two lengths of PEX under the future slab. The riser penetrations are sleeved, and the line has passed a 90-psi water test. How should the buried run be completed?
Correct answer: C - Replace it with continuous PEX between above-slab connection points.
Since a check valve was installed at the water meter, a home's pressure rises from 54 psi to 112 psi while the storage water heater reheats with all fixtures closed. Water temperature remains at the 120°F setting, and briefly opening a faucet returns pressure to 54 psi. Which addition addresses this pressure pattern?
Correct answer: D - A properly sized potable-water expansion tank near the heater.
A drainage drawing specifies a 3-inch, 85-foot soil stack serving six 1.28-gallon-per-flush water closets and six lavatories. The total load is 30 drainage fixture units. Kentucky's stack table allows 36 fixture units and 225 feet for 3-inch piping. Which code restriction defeats the 3-inch selection?
Correct answer: A - The stack exceeds the four-water-closet limit for low-flush fixtures.
The drainage schedule for a licensed food establishment shows a three-compartment utensil sink and a separate food-preparation-only sink each discharging indirectly into its own trapped 3-inch floor receptor. What revision belongs on the drainage schedule?
Correct answer: B - Connect the utensil sink directly through a drain at least 2 inches in diameter.
A kitchen sink's 1-1/2-inch trap arm reaches a vent only 32 inches away in a straight line. Because the piping turns around an obstruction, the developed trap-to-vent distance is 50 inches. The arm's grade and vent takeoff elevation are otherwise correct. Which proposed change corrects the trap-arm violation?
Correct answer: A - Move the vent takeoff to a developed distance of 36 inches.
During the final test of a completed cast-iron drain, waste, and vent system, a worker applies the 5-psi pressure used for rough-in testing. Water is forced out of several properly filled fixture traps. The test is stopped and the pressure safely relieved. Select the appropriate final retest.
Correct answer: C - Refill the traps; apply 1 inch of water-column air pressure for at least 15 minutes.
Specify an inline mechanical backflow assembly for a continuously pressurized potable makeup line to a process tank containing a toxic chemical. A downstream pump can raise tank-side pressure above supply pressure. Which assembly fits this service?
Correct answer: B - Reduced-pressure-principle backflow prevention assembly.
Survey notes for a proposed straight, 48-foot house sewer show an upstream invert elevation of 101.20 feet and a downstream invert elevation of 100.45 feet. The pipe will have a uniform grade between those points. Which assessment of the proposed grade is correct under Kentucky's house-sewer rule?
Correct answer: A - The slope is 3/16 inch per foot, within the permitted range.
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