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These 10 free MPE questions are organized by exam domain, so you can see how each part of the Mechanical Plans Examiner blueprint is tested. Reveal the answer and explanation under each question.
An engineer proposes a duct construction method not expressly prescribed in the 2021 IMC. The submittal includes calculations and test reports from an approved agency addressing equivalence to the prescribed construction. What provides the authority to use this alternative?
Correct answer: A - The code official's approval of the alternative based on demonstrated equivalence.
Above a finished office ceiling, a cooling coil has no auxiliary drain pan. Instead, a UL 508 water-level device is installed in the equipment's primary pan, above the primary drain connection and below the overflow rim. It shuts off the equipment on a primary-drain blockage before overflow occurs. The manufacturer's instructions permit this arrangement. Which review comment is justified by the 2021 IMC?
Correct answer: D - Accept the device as an allowed alternative to secondary drainage.
A hot-water boiler detail places a full-port ball valve between the boiler's relief opening and its pressure-relief valve. The valve is marked 'lock open for normal operation' to allow relief-valve replacement. A high-temperature limit and low-water cutoff are also shown. What revision does the 2021 IMC require?
Correct answer: A - Remove the shutoff valve between the boiler and its relief valve.
A cafe adds an electric griddle used to cook bacon beneath an existing Type II hood. The proposed operation produces grease-laden vapors, and no listed recirculating system or reduced-emissions exception applies. The designer argues that electric cooking does not require Type I exhaust. Under the 2021 IMC, which conclusion is correct?
Correct answer: C - The grease-laden vapors require a Type I hood.
For a 900-square-foot classroom serving students age 9 and older, the approved design population is 24 students plus one teacher. Apply the 2021 IMC rates of 10 cfm per person and 0.12 cfm per square foot. The applicable zone air-distribution effectiveness is 0.80. Total supply is 2,000 cfm, with the balance above the outdoor-air portion recirculated. Which offered outdoor-air setting is the lowest one that meets the zone requirement?
Correct answer: C - 450 cfm
An ASTM E84 report for pipe insulation, tested with its adhesive as installed, gives a flame-spread index of 20 and a smoke-developed index of 65. The insulation will be exposed in an office return-air plenum. Applying the 2021 IMC plenum insulation limits, how should these results be interpreted?
Correct answer: A - Flame spread complies; smoke development does not.
A duct penetration through a 2-hour wall requires both fire and smoke protection. The system keeps air moving through this duct during a fire until the damper closes. Which schedule entry satisfies the 2021 IMC requirements? Installation details and ratings not shown are otherwise compliant.
Correct answer: D - Dynamic combination damper: 1.5-hour fire rating; Class II smoke leakage.
The combustion-air drawing specifies the 2021 IFGC two-opening outdoor-air method with horizontal ducts. Two room-air appliances have input/output ratings of 120,000/96,000 Btu/h and 60,000/48,000 Btu/h. Each louver has a verified free area of 60 percent of its gross face area. Opening locations and minimum dimensions comply. Which is the smallest proposed gross area that is adequate for EACH louver?
Correct answer: B - 160 square inches
Because a gas furnace has a combustion-air inducer, a reviewer has requested positive-pressure venting. The manufacturer's data instead establish nonpositive vent pressure and a flue-gas temperature that avoids excessive condensate. The specified Type B vent otherwise satisfies the appliance listing and applicable sizing rules. How should the venting classification be resolved under the 2021 IFGC?
Correct answer: D - Category I; fan assistance does not establish positive-pressure vent operation.
On a natural-gas riser sized by the 2021 IFGC longest-length method, the most remote outlet is 95 developed feet from the point of delivery. An 18-foot final branch serves only a furnace rated at 126,000 Btu/h input and 100,800 Btu/h output. Other appliances total 84,000 Btu/h input. Gas heating value is 1,050 Btu per cubic foot; no diversity applies. The applicable capacity table has 20-, 80-, and 100-foot rows, but no 95-foot row. Which length row and demand belong in the final furnace-branch calculation?
Correct answer: B - 100-foot row; 120 cubic feet per hour
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