NCIDQ - IDFX - Chapter 13 - Mechanical & Electrical Systems Exam | Questions with
100% Correct Answers | Updated &Verified | 2024-2025 | 100% Score
All-air system - ✔✔Heating and/or cooling system that uses only conditioned air to meet thermal loads
of building. Ex. residential forced hot air furnace or boiler. Commercial systems include variable air
volume (VAV), high-velocity dual ducts, constant volume with reheat, and multi-zone systems
All-water system - ✔✔An air-conditioning system in which either hot or chilled water is piped to fan-coil
units in the served spaces, where air is circulated locally. Circulated with fans or fin-tube radiators
Mixing box - ✔✔Adjusts the quantity or temperature of air going into a space from the main air supply
line(s), reduces the velocity of air, and attenuates noise
Mixing box sizes - ✔✔Can range from 6" to 18" high, 24" to 60" long and 14" to 66" wide
Chase Wall - ✔✔consists of two runs of studs separated by several inches, the exact dimension being
determined by the largest pipe or duct that has to be concealed
Toilet Carrier - ✔✔Steel framework that is bolted to the floor inside the pipe chase and carries the
weight of the wall-hung toilets
Access doors - ✔✔Typically small steel doors with frames that are opened by using a thumbturn or key
Slot Air Diffusers - ✔✔Can be used when the appearance of the air distribution device needs to be
minimized or when the available space does not allow a square diffuser.
Nonmetallic sheathed cable - ✔✔Electrical cable consisting of two or more insulated conductors
enclosed in and nonmetallic, moisture resistant, flame retardant sheath . Also called romex cable. Used
in wood stud residential and buildings less than 3 floors.
100% Correct Answers | Updated &Verified | 2024-2025 | 100% Score
All-air system - ✔✔Heating and/or cooling system that uses only conditioned air to meet thermal loads
of building. Ex. residential forced hot air furnace or boiler. Commercial systems include variable air
volume (VAV), high-velocity dual ducts, constant volume with reheat, and multi-zone systems
All-water system - ✔✔An air-conditioning system in which either hot or chilled water is piped to fan-coil
units in the served spaces, where air is circulated locally. Circulated with fans or fin-tube radiators
Mixing box - ✔✔Adjusts the quantity or temperature of air going into a space from the main air supply
line(s), reduces the velocity of air, and attenuates noise
Mixing box sizes - ✔✔Can range from 6" to 18" high, 24" to 60" long and 14" to 66" wide
Chase Wall - ✔✔consists of two runs of studs separated by several inches, the exact dimension being
determined by the largest pipe or duct that has to be concealed
Toilet Carrier - ✔✔Steel framework that is bolted to the floor inside the pipe chase and carries the
weight of the wall-hung toilets
Access doors - ✔✔Typically small steel doors with frames that are opened by using a thumbturn or key
Slot Air Diffusers - ✔✔Can be used when the appearance of the air distribution device needs to be
minimized or when the available space does not allow a square diffuser.
Nonmetallic sheathed cable - ✔✔Electrical cable consisting of two or more insulated conductors
enclosed in and nonmetallic, moisture resistant, flame retardant sheath . Also called romex cable. Used
in wood stud residential and buildings less than 3 floors.
