2021 M2 Commercial Mechanical Inspector Exam Quiz Welcome to your free 2021 M2 Commercial Mechanical Inspector Exam Quiz REQUIRED - Enter your email address to receive a printable copy of your test results. 1. Reduced clearance protective assemblies for mechanical appliances, devices and equipment must not be placed less than ___________ from the mechanical appliance, device or equipment it protects. 1/2 inch 1 inch 1 1/2 inches 2 inch 2. Mechanical and gravity outdoor air intake openings must have a minimum horizontal clearance of ___________ from any hazardous or noxious contaminant sources such as vents, streets, alleys, parking lots and loading docks. 5 feet 10 feet 15 feet 20 feet 3. In the airflow design method for smoke control systems, the airflow toward the fire must not exceed __________ per minute. 100 feet 200 feet 300 feet 400 feet 4. Fire dampers are not required at penetrations in parking garage exhaust or supply shafts that are separated from other building shafts by a minimum of __________ fire-resistance-rated construction. 1-hour 2-hour 3-hour 4-hour 5. A nonlisted chimney connector serving a domestic-type oil appliance, labeled for venting with Type L vents, must have a min. clearance of ___________ to combustibles. 9 inches 18 inches 27 inches 36 inches 6. Oil-fired unit heaters must be tested in accordance with which of the following standards? UL 545 UL 731 UL 930 UL 1122 7. Low-water __________ must automatically stop the combustion operation of the appliance when the water level drops below the lowest safe water level as established by the manufacturer. cutoff controls flow sensing controls both cutoff and flow sensing controls shutoff control 8. Gases to be purged from a hydrogen piping system must be discharged outdoors and must be ___________ feet or more from lot lines and building openings. 5 10 15 20 9. Before connection header trenches are backfilled, the assembled plastic pipe ground-source heat pump loop system must be pressure tested with water at __________ for 15 minutes. 50 psi 100 psi 150 psi 200 psi 10. Solar energy system components that contain pressurized fluids must be protected against pressures and temperatures exceeding design limitations with a __________. backflow valve check valve pressure and temperature relief valve shutoff valve 11. In administration, of the following, which is not required on a permit application? description of work location of work proposed occupancy type of construction 12. The definition of a location that you cannot access without damage to the finish structure or permanent parts of the building structure. Concealed Location Hidden Location Inaccessible Location Secured Location 13. In general regulations, when appliances or other components require service and roof hatch openings that are within 10 feet of the open side of a walking surface more than 30 inches above the floor, grade below or roof, or the edge of a roof, __________ must be provided. Guards Handholds Protection Warning signs 14. In an LP-gas dispensing system for motor vehicles, a(n) __________ and a manual shut-off must be located between the dispenser inlet and the pump in the liquid line if the dispenser device is not part of a complete storage and dispensing unit mounted on a common base, but is installed at a remote location. automatic-closing-type hose nozzle valve automatic shut-off Valve excess flow-control check valve pressure valve 15. A 16-inch diameter vent connector for a medium-heat appliance that has an internal area of 190 square inches has a minimum thickness of __________. 0.053 inches 0.067 inches 0.093 inches 0.123 inches 16. A room heater that is unvented may not have more than __________ BTU/h of input rating. 14,000 28,000 40,000 54,000 17. The pneumatic test pressure of a hydrogen piping system must be at least _________ psig. 5 10 25 50 18. A liquid fuel vent pipe for a fuel oil piping system must terminate outside of a building a min. of __________ measured vertically or horizontally from any building opening. 1 foot 2 feet 3 feet 4 feet 19. Conduit for gas piping that terminates outdoors must extend for at least __________ inches outside the building, where the gas piping is required to be inside conduit. 2 4 8 16 20. If a 90-degree elbow 8-inches in radius is used as a dryer exhaust duct fitting, the equivalent length is __________. 1 foot, 3 inches 18 inches 1 foot, 7 inches 19 inches