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The MI-JP exam has 125 questions and runs 3 hours.
These 10 free MI-JP questions are organized by exam domain, so you can see how each part of the Michigan Journey Plumber License Exam blueprint is tested. Reveal the answer and explanation under each question.
The test record for a completed copper water-supply section shows a 68-psi working pressure, a potable-water test at 76 psi, and a 20-minute hold with no pressure loss or visible leakage. The components are rated for that test pressure. Under the 2021 Michigan Plumbing Code, how should the pressure-and-duration portion of this test be evaluated?
Correct answer: A - Accept it; pressure is above working pressure and the hold exceeds 15 minutes.
A pipe must offset 9 inches sideways and 12 inches upward between parallel runs. Two 45-degree elbows will form the rolling offset. Each elbow has a 1.5-inch takeoff, measured from the centerline intersection to the end of the fully assembled pipe. What length should be cut for the straight piece between the elbows, to the nearest tenth of an inch?
Correct answer: C - 18.2 inches
At a Michigan child-care center, storage water is maintained at 140°F for a separately controlled kitchen load. A handwashing faucet has an ASSE 1070 temperature-limiting device, but its measured maximum delivery temperature is 116°F. The device responds normally to adjustment. What is the appropriate first correction while preserving the kitchen supply?
Correct answer: D - Adjust the fixture's limiting device to a maximum delivery temperature of 105°F.
Since a backflow assembly was installed at a small commercial building, water pressure has begun rising during water-heater recovery. Pressure is 58 psi before heating and 112 psi afterward; briefly opening a faucet returns it to 58 psi. Pressure upstream of the assembly remains steady, and no expansion-control device is installed. Which correction addresses the cause?
Correct answer: B - Install a properly sized expansion tank on the heater side of the backflow assembly.
A straight sanitary stack serves four branch intervals and carries 360 drainage fixture units (DFU), with 110 DFU entering in the busiest interval. Table 710.1(2) gives these limits for stacks with more than three branch intervals, expressed as total stack DFU / DFU entering one interval: 3-inch, 72/20; 4-inch, 500/90; 5-inch, 1,100/200; 6-inch, 1,900/350. What is the smallest acceptable stack diameter?
Correct answer: C - 5 inches
On a renovation drawing, two bathroom groups on the same floor have a properly sized horizontal wet vent. A separately vented kitchen sink is then shown connecting midway through the wet-vented portion. The downstream branch has capacity for the added load. To preserve the bathroom wet-vent arrangement, the kitchen waste connection belongs:
Correct answer: A - Downstream of the entire wet-vented portion.
An ice-storage bin drains into a trapped, vented floor receptor. To reduce splashing, an installer extends the bin's waste pipe below the receptor's flood-level rim, keeping its end above the normal standing water. Which revised connection provides the required protection if the receptor backs up?
Correct answer: D - Terminate the bin drain through an air gap above the receptor's flood-level rim.
A process skid requires a continuous pressurized potable-water makeup connection. Its circulating fluid contains a toxic additive, and its pump can raise downstream pressure above the potable supply pressure. An atmospheric break tank is not part of the design. Select the assembly that protects against both the stated health hazard and the possible reverse-flow mechanism.
Correct answer: B - A listed reduced-pressure-principle backflow assembly.
A 2-inch horizontal waste branch approaches a 3-inch horizontal drain at a right angle. The connection must turn the branch flow into the downstream drain without a vertical drop. Which fitting arrangement is appropriate?
Correct answer: B - A reducing combination wye and eighth bend, swept toward downstream flow.
A listed branch air-admittance valve is checked in its required orientation. It admits air when drain pressure falls below room pressure, then seals at equal or positive pressure. A coworker calls it defective because it will not exhaust a positive-pressure pulse. The test instead demonstrates:
Correct answer: A - Normal operation; the valve admits air but does not relieve positive pressure.
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