NC MECHANICAL 1 TEST (NC CODE MECHANICAL LEVEL 1) | 133 QUESTIONS AND
ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTION
Design professional engineer - (ANSWER)Which of the following can inspect welds on steel I beams in a
commercial structure: A. Building inspector B. Contractor C. Designed professional engineer D. Jose the
weld - ✔✔C
Outdoor heated pool covers - (ANSWER)Outdoor heated pool covers shall be provided with a ________?
- ✔✔Class 1 vapor retardant cover
Total duct leakage - (ANSWER)In a residence, Total duct leakage shall be less than or equal to __ cfm per
100 sq/ft of conditioned floor area served by that system - ✔✔5
Heat pump controls - (ANSWER)In a residence, Heat pumps having supplementary electric-resistance
heat shall have controls that, except during defrost, prevent heat operation when _____? - ✔✔the heat
pump compressor can meet the heating load
Heat pump lockout settings - (ANSWER)In a residence, Heat pump lockout shall be set no lower than
____ and no higher than ____. - ✔✔35*F, 40*F
Return ducts insulation - (ANSWER)Are return ducts inside semi-conditioned and conditioned spaces of a
residence required to be insulated? - ✔✔Not required, other than may be necessary
Thermostat control in commercial occupancy - (ANSWER)In a commercial occupancy, a thermostat is
allowed to control multiple zones from one thermostat - ✔✔False, each zone must be controlled by
individual controls within that zone.
Climate zone of Alamance county - (ANSWER)Alamance county is in climate zone _____ - ✔✔4A
Minimum screen mesh size - (ANSWER)The minimum screen mesh size for a vent terminating to the
outdoors in a residence is? - ✔✔Not less than 1/4"
Hazardous exhaust system requirement - (ANSWER)A hazardous exhaust system is required when
______, except in laboratories - ✔✔see M510.2
, NC MECHANICAL 1 TEST (NC CODE MECHANICAL LEVEL 1) | 133 QUESTIONS AND
ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTION
Exhaust system requirement - (ANSWER)An exhaust system is required when ____? - ✔✔Equipment and
processes in such areas produce or throw off dust or particles sufficiently to float in the air, or which
emit heat, odors, fumes, spray, gas or smoke in such quantities so as to be irritating or injurious to
health and safety
Maximum screen opening size - (ANSWER)The maximum opening size of a screen on an air intake can be
no larger than ___ Inch. - ✔✔1/2
Condensate waste line size - (ANSWER)Condensate waste and drain line sizes shall be no smaller than
____. - ✔✔3/4"
Condensate drain slope - (ANSWER)The slope of a condensate drain shall be no less than _____ inch per
12 inches - ✔✔1/8"
Portable space heater usage - (ANSWER)Can a portable space heater be used to provide space heating in
an interior space intended for human occupancy? - ✔✔No. Heating systems need to be permanently
affixed.
Space heating temperature maintenance - (ANSWER)Space heating systems need to be capable of
maintaining a temperature of ____*F - ✔✔68
Carbon monoxide installation requirement - (ANSWER)Which requires a carbon monoxide to be
installed? A. A heat pump changeout B. Gas Stove installation C. Radiant Heater - ✔✔B; "...where fuel
fired appliances or fireplaces are added or replaced..."
Supply air recirculation for pools - (ANSWER)Supply air to a swimming pool and associated deck areas
shall not be recirculated unless such air is _______? - ✔✔dehumidified to maintain the relative humidity
of the area at 60% or less
ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTION
Design professional engineer - (ANSWER)Which of the following can inspect welds on steel I beams in a
commercial structure: A. Building inspector B. Contractor C. Designed professional engineer D. Jose the
weld - ✔✔C
Outdoor heated pool covers - (ANSWER)Outdoor heated pool covers shall be provided with a ________?
- ✔✔Class 1 vapor retardant cover
Total duct leakage - (ANSWER)In a residence, Total duct leakage shall be less than or equal to __ cfm per
100 sq/ft of conditioned floor area served by that system - ✔✔5
Heat pump controls - (ANSWER)In a residence, Heat pumps having supplementary electric-resistance
heat shall have controls that, except during defrost, prevent heat operation when _____? - ✔✔the heat
pump compressor can meet the heating load
Heat pump lockout settings - (ANSWER)In a residence, Heat pump lockout shall be set no lower than
____ and no higher than ____. - ✔✔35*F, 40*F
Return ducts insulation - (ANSWER)Are return ducts inside semi-conditioned and conditioned spaces of a
residence required to be insulated? - ✔✔Not required, other than may be necessary
Thermostat control in commercial occupancy - (ANSWER)In a commercial occupancy, a thermostat is
allowed to control multiple zones from one thermostat - ✔✔False, each zone must be controlled by
individual controls within that zone.
Climate zone of Alamance county - (ANSWER)Alamance county is in climate zone _____ - ✔✔4A
Minimum screen mesh size - (ANSWER)The minimum screen mesh size for a vent terminating to the
outdoors in a residence is? - ✔✔Not less than 1/4"
Hazardous exhaust system requirement - (ANSWER)A hazardous exhaust system is required when
______, except in laboratories - ✔✔see M510.2
, NC MECHANICAL 1 TEST (NC CODE MECHANICAL LEVEL 1) | 133 QUESTIONS AND
ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTION
Exhaust system requirement - (ANSWER)An exhaust system is required when ____? - ✔✔Equipment and
processes in such areas produce or throw off dust or particles sufficiently to float in the air, or which
emit heat, odors, fumes, spray, gas or smoke in such quantities so as to be irritating or injurious to
health and safety
Maximum screen opening size - (ANSWER)The maximum opening size of a screen on an air intake can be
no larger than ___ Inch. - ✔✔1/2
Condensate waste line size - (ANSWER)Condensate waste and drain line sizes shall be no smaller than
____. - ✔✔3/4"
Condensate drain slope - (ANSWER)The slope of a condensate drain shall be no less than _____ inch per
12 inches - ✔✔1/8"
Portable space heater usage - (ANSWER)Can a portable space heater be used to provide space heating in
an interior space intended for human occupancy? - ✔✔No. Heating systems need to be permanently
affixed.
Space heating temperature maintenance - (ANSWER)Space heating systems need to be capable of
maintaining a temperature of ____*F - ✔✔68
Carbon monoxide installation requirement - (ANSWER)Which requires a carbon monoxide to be
installed? A. A heat pump changeout B. Gas Stove installation C. Radiant Heater - ✔✔B; "...where fuel
fired appliances or fireplaces are added or replaced..."
Supply air recirculation for pools - (ANSWER)Supply air to a swimming pool and associated deck areas
shall not be recirculated unless such air is _______? - ✔✔dehumidified to maintain the relative humidity
of the area at 60% or less
