Avixa, AV Design 2: Infrastructure Exam Questions with Correct Solutions|
Latest Update Graded A+
Isolated Ground Circuit Allows an equipment enclosure (equipment rack) to be isolated from
the raceway containing circuits supplying only that equipment by one or more listed
nonmetallic raceway fittings.
Isolated Receptacle A receptacle in which the grounding terminal is purposely insulated
from the receptacle mounting means. Isolated receptacles are identified by a triangle engraved
on the face and are available in standard colors.
Law of Conservation of Energy Says that the total energy cannot be created or destroyed.
Energy can be transformed from one form to another, and transferred from one body to
another, but the total amount of energy remains constant.
Leakage (Residual) Currents Current that could be found on accessible conductive parts of
the enclosure
Listed Equipment, materials, or services included in a list published by an Nationally
Recognized Testing Laboratory (NRTL), such as Underwriters Laboratory (UL)
Lumen a measure of the light quantity emitted from a constant light source across one
square meter.
Luminaire sometimes called a lighting fixture, is a complete lighting unit consisting of a
lamp(s) and ballast(s) (when applicable) together with the parts designed to distribute the light,
to position and protect the lamps, and to connect the lamps to the power supply
Luminance Light emitted or reflected from an object in a given direction, measured in
Candelas per square meter (cd/m2, also referred to as a 'nit')
Lux A contraction of the words luminance and flux; 10.78 lux is equal to 1 footcandle.
, Noise Defense preventing interference by containing noise at the source, preventing noise
from entering, and/or employing proven noise defense mechanisms
Power the rate at which work is done.
Raceway An enclosed channel of metal or nonmetallic materials designed expressly for
holding wires, cables, or busbars, with additional functions as permitted in this Code.
Resistance The property that opposes the flow of electrical current.
Reverberant Field A reverberation that is well enough spatially diffused that it is essentially
the same at all points in a room.
Reverberation The combination of many acoustic reflections that are dense enough in time
so as to not be audible as reflections but instead to act as a statistical sonic decay "tail" to
sounds in the room.
RT60 The time taken for the energy in an initially steady reverberant sound field to decay by
60 dB after the source of the sound ceases.
Scene A recallable configuration of lighting levels for one or more zones.
SCIN - Shield Current Induced Noise Induced into the signal conductor of a single conductor
and shield cable or induced unequally onto a twisted pair cable.
Shielding A metallic partition placed between two regions of space in order to control the
propagation of electric and magnetic fields from one of the regions to the other.
Latest Update Graded A+
Isolated Ground Circuit Allows an equipment enclosure (equipment rack) to be isolated from
the raceway containing circuits supplying only that equipment by one or more listed
nonmetallic raceway fittings.
Isolated Receptacle A receptacle in which the grounding terminal is purposely insulated
from the receptacle mounting means. Isolated receptacles are identified by a triangle engraved
on the face and are available in standard colors.
Law of Conservation of Energy Says that the total energy cannot be created or destroyed.
Energy can be transformed from one form to another, and transferred from one body to
another, but the total amount of energy remains constant.
Leakage (Residual) Currents Current that could be found on accessible conductive parts of
the enclosure
Listed Equipment, materials, or services included in a list published by an Nationally
Recognized Testing Laboratory (NRTL), such as Underwriters Laboratory (UL)
Lumen a measure of the light quantity emitted from a constant light source across one
square meter.
Luminaire sometimes called a lighting fixture, is a complete lighting unit consisting of a
lamp(s) and ballast(s) (when applicable) together with the parts designed to distribute the light,
to position and protect the lamps, and to connect the lamps to the power supply
Luminance Light emitted or reflected from an object in a given direction, measured in
Candelas per square meter (cd/m2, also referred to as a 'nit')
Lux A contraction of the words luminance and flux; 10.78 lux is equal to 1 footcandle.
, Noise Defense preventing interference by containing noise at the source, preventing noise
from entering, and/or employing proven noise defense mechanisms
Power the rate at which work is done.
Raceway An enclosed channel of metal or nonmetallic materials designed expressly for
holding wires, cables, or busbars, with additional functions as permitted in this Code.
Resistance The property that opposes the flow of electrical current.
Reverberant Field A reverberation that is well enough spatially diffused that it is essentially
the same at all points in a room.
Reverberation The combination of many acoustic reflections that are dense enough in time
so as to not be audible as reflections but instead to act as a statistical sonic decay "tail" to
sounds in the room.
RT60 The time taken for the energy in an initially steady reverberant sound field to decay by
60 dB after the source of the sound ceases.
Scene A recallable configuration of lighting levels for one or more zones.
SCIN - Shield Current Induced Noise Induced into the signal conductor of a single conductor
and shield cable or induced unequally onto a twisted pair cable.
Shielding A metallic partition placed between two regions of space in order to control the
propagation of electric and magnetic fields from one of the regions to the other.
