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The MA-JP exam has 120 questions and runs 5 hours 20 minutes.
These 10 free MA-JP questions are organized by exam domain, so you can see how each part of the Massachusetts Journeyman Plumber License Examination blueprint is tested. Reveal the answer and explanation under each question.
A licensed plumber finds that a faucet drips because its washer is worn. The repair will replace only the washer; neither the fixture nor its connected piping will be changed. How does Massachusetts permitting apply to this work?
Correct answer: C - The working-part leak repair is exempt from the permit requirement
An appliance requires an inlet gas pressure of 5-10 inches water column. With the burners off, a manometer reads 7.2 inches at its inlet. When the connected appliances fire together, the meter outlet remains at 7.2 inches, but this appliance's inlet falls to 3.4 inches. What do these readings most directly establish?
Correct answer: B - Excessive pressure loss between the meter and appliance
A straight, unbranched 60-foot section of 4-inch horizontal building drain has full-size cleanouts only at its two ends. Both are accessible, correctly oriented, and have 20 inches of working clearance. No other cleanout access serves the run. Which revision is needed?
Correct answer: B - Add a full-size accessible cleanout at the midpoint
During a shower callback, the water becomes abruptly hotter whenever a nearby toilet refills. Testing shows that cold-water pressure at the shower drops while hot-water pressure and the water heater's outlet temperature remain steady. Which device is specifically designed to compensate for this pressure imbalance at the shower?
Correct answer: A - A pressure-balancing mixing valve at the shower
After a water meter with an integral check valve is installed, a home's water pressure rises from 58 psi to 112 psi during each water-heater recovery cycle. Opening a faucet brings it back to 58 psi. With the heater off, pressure remains steady, and testing confirms normal water temperature and thermostat operation. There is no expansion tank. Which correction addresses the cause?
Correct answer: D - Install a correctly sized potable-water expansion tank
A chemical-process water connection must be protected against both backsiphonage and backpressure. The process pump can raise chemical-side pressure above the potable supply pressure, and the water supplier has classified the solution as a health hazard. Which of these assemblies provides the required type of protection?
Correct answer: D - A reduced-pressure-zone backflow prevention assembly
A restaurant's commercial dishwasher discharges at 140°F. The owner proposes bypassing the grease interceptor because hot water should keep the grease moving. All other installation requirements are satisfied. How must the dishwasher waste be routed under Massachusetts plumbing requirements?
Correct answer: A - Through a properly sized grease interceptor before entering the sanitary drain
A drainage isometric specifies flow through J → K → L → stack S. A lavatory and a bathtub join at J. A residential laundry connection joins at L. A tank-type water closet enters stack S above the point where this branch connects. There are no other connections. Use these drainage fixture-unit values: lavatory, 1; bathtub, 2; residential laundry connection, 3; tank-type water closet, 4. The drainage load carried by segment K-L, before the connection at L, is:
Correct answer: A - 3 drainage fixture units
A low-pressure natural-gas layout has a 14-foot segment J-K feeding a 140,000-BTU/h boiler and a 90,000-BTU/h water heater. A 300,000-BTU/h appliance connects on a separate branch upstream of J. The longest meter-to-outlet route in this pressure zone is 47 feet. Use the longest-length method and a heating value of 1,000 BTU per cubic foot. Iron-pipe capacities below are in cubic feet per hour, for gas specific gravity 0.6 and a 0.3-inch-water-column pressure drop. Pipe sizes, in order: 3/4 inch; 1 inch; 1-1/4 inches; 1-1/2 inches. 20-foot row: 190; 350; 730; 1,100. 40-foot row: 130; 245; 500; 760. 50-foot row: 115; 215; 440; 670. Use the next longer listed length; do not interpolate. What is the smallest listed size that can serve segment J-K?
Correct answer: C - 1-1/4 inches
The manufacturer's specifications for a replacement gas boiler identify positive vent pressure and condensing operation. The existing vent served a natural-draft appliance. Which classification and performance requirements should govern selection of the replacement boiler's vent?
Correct answer: D - Category IV: positive-pressure containment and resistance to condensate
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