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The MI-MP exam has 130 questions and runs 3 hours.
These 10 free MI-MP questions are organized by exam domain, so you can see how each part of the Michigan Master Plumber License Exam blueprint is tested. Reveal the answer and explanation under each question.
A restroom renovation will place 26 drainage fixture units on a 3-inch horizontal fixture branch laid at 1/4 inch per foot. The installer requests approval using the 42-DFU capacity listed for a 3-inch building drain at that slope. The branch receives public water closets and lavatories. How should this sizing submittal be evaluated?
Correct answer: D - Reject: a 3-inch horizontal fixture branch is limited to 20 DFU.
A 48-foot, 4-inch horizontal drain will carry grease-laden kitchen waste to a grease interceptor. The available route permits only 8 inches of total fall. The proposed pipe diameter has adequate capacity. Which grading decision is correct for this upstream drain?
Correct answer: D - A 12-inch fall is required, so the route or elevations must change
A flushometer requires 20 psi while operating. Upstream of the building's meter and backflow assembly, a gauge reads 66 psi with no flow and 54 psi at design demand. The flushometer is 30 feet above that gauge. At that demand, meter and backflow-assembly losses total 7 psi, and pipe and fitting losses total 9 psi. Use 0.433 psi per foot for elevation loss. Which pressure assessment is correct, to the nearest whole psi?
Correct answer: A - 25 psi at the flushometer; its flowing-pressure requirement is met
At a Michigan child care center, a central ASSE 1017 mixing valve supplies the handwashing lavatories. Each outlet measures 106 degrees F, but none has an individual temperature-limiting device. The installer argues that the measured temperature makes additional protection unnecessary. What does the installation still require?
Correct answer: D - An individual ASSE 1070 temperature-limiting device at each lavatory
After a check valve is installed in an office building's water service, pressure downstream of the valve rises from 58 psi to 112 psi during water-heater recovery. Upstream pressure stays at 58 psi, the heater maintains its normal temperature, and briefly opening a downstream cold-water faucet returns the pressure to 58 psi. Which fault best fits these observations?
Correct answer: B - Uncontrolled thermal expansion in a closed water system
A closed process loop contains a toxic corrosion inhibitor. Its booster pump can raise process pressure above the potable-water supply pressure. The approved design requires an in-line, pressurized makeup-water connection rather than an air-gapped break tank. Which assembly can protect against both the health hazard and the anticipated pressure reversal?
Correct answer: A - Reduced-pressure-principle backflow prevention assembly
A commercial sink is used only to wash pots and serviceware, not to prepare or handle food. Its indirect waste outlet terminates below the receptor's flood-level rim but above the trap seal. The approved waste-treatment design does not require a direct connection to a hydromechanical grease interceptor. The receptor's capacity, trapping, and venting comply. Under Michigan's warewashing provision, what is the correct disposition of this indirect connection?
Correct answer: C - Accept the air break for this warewashing use
A Michigan PVC drainage-and-vent installation is ready for its required rough test. The pipe manufacturer's instructions permit the proposed low-pressure test. After temperature and gasket adjustments, the isolated system holds 5 psi of air for 18 minutes without added air or pressure loss. Test closures are secured and the required inspection arrangements are in place. How should this test be classified?
Correct answer: B - Acceptable under Michigan's low-pressure air-test provision for plastic DWV piping
Two same-floor bathroom groups have an otherwise compliant horizontal wet vent. A separately trapped and vented kitchen sink has been added, with its drain entering between the upstream lavatory connection and the downstream water-closet connection. The contractor wants to retain the bathroom wet vent. Where must the kitchen-sink drain be connected?
Correct answer: A - Downstream of the entire wet-vented section
The take-off for two back-to-back restrooms includes an individual dry vent for a water closet. The required drain size served by this vent is 3 inches. This vent has a developed length of 48 feet and exits through the roof without joining another vent. Any roof enlargement will begin 18 inches below the roof. What are the minimum diameters for the vent below that enlargement and for the roof extension, respectively?
Correct answer: C - 2 inches below the enlargement; 3 inches through the roof
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