IDFX LIGHTING EXAMPREP TESTED
QUESTIONS WITH ACCURATE RESPONSES
PREMIUM LEARNING PACKAGE
●● Define composite wood veneer.
Answer: Product made by slicing readily available, fast-growing trees
into veneers, dyeing the veneers, and then gluing them together to create
an artificial log. The log is then re sliced to produce a variety of wood
veneers.
●● Define clerestory.
Answer: Vertically glazed area placed between 2 different roof levels to
admit natural light.
●● What is the unit of measure for the frequency of sound?
Answer: The hertz is the unit of measure for this and is equal to one
cycle per second (Hz)
●● What is the unit of measure for sound intensity, based on a
logarithmic scale?
Answer: The decibel (dB) is the unit of measure for this.
●● What do most people perceive when a sound increases by 10 dB?
,Answer: When a sound increases by this amount, most people perceive a
doubling in loudness.
●● What frequency range can be heard by most healthy young people?
Answer: This range is 20 Hz to 20,000 Hz.
●● What is the coefficient of absorption?
Answer: This is the ratio of the sound intensity absorbed by a material to
the total sound intensity reaching the material.
●● What is the noise reduction coefficient (NRC)?
Answer: This is a single-number average of a material's coefficients of
absorption at 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz, rounded to the
nearest 0.05.
●● What is reverberation time?
Answer: This is the time it takes for the sound level in a space to
decrease 60 dB after the source has stopped producing the sound.
●● What is the ceiling attenuation class (CAC)?
Answer: This is a single-number measure of the transmission loss
through ceiling tiles between two closed rooms where there is no barrier
above the suspended ceiling.
,●● What percentage range of a commercial building's total energy use is
typically devoted to electric lighting and the cooling it requires?
Answer: 30% to 40% of a commercial buildings total energy use is
typically devoted to this.
●● What are the 3 most common types of interior glazing?
Answer: The 3 most common types are: Float, Tempered, and Laminated
●● What are the primary elements used to make bronze?
Answer: Copper and tin are used to make this material.
●● What is a concrete masonry unit?
Answer: This building product, abbreviated CMU, is also commonly
known as concrete block.
●● What is mean radiant temperature?
Answer: This is a measure of the heat a person gains from or loses to his
or her surroundings through radiation. It is used in assessing how
comfortable a room is.
The value is a weighted average of the various surface temperatures in a
room (taking into account an occupant's angle of exposure to these
surfaces) and any sunlight present.
, ●● What is the standard depth of metal studs?
Answer: Standard depth for these construction components are 1 5/8", 2
1/2", 3 5/8", 4", and 6" (41, 64, 92, 102, and 152 mm)
●● What is the generic name for fire-rated gypsum wallboard?
Answer: Type X is the generic name of this material.
●● What are 4 advantages of using Portland cement plaster as a finish
material?
Answer: As a finish material, this has the advantages of being:
- hard and abrasion resistant
- water resistant
- easily formed into curves and ornate surfaces
- a good base for wall tile
●● What are 4 disadvantages of using portland cement plaster as a finish
material?
Answer: As a finish material, this has the disadvantages of being:
- more expensive than gypsum wallboard
- slower to construct than gypsum wallboard
- wet and messy to work with
- challenging to work with, this requiring more-skilled labor
QUESTIONS WITH ACCURATE RESPONSES
PREMIUM LEARNING PACKAGE
●● Define composite wood veneer.
Answer: Product made by slicing readily available, fast-growing trees
into veneers, dyeing the veneers, and then gluing them together to create
an artificial log. The log is then re sliced to produce a variety of wood
veneers.
●● Define clerestory.
Answer: Vertically glazed area placed between 2 different roof levels to
admit natural light.
●● What is the unit of measure for the frequency of sound?
Answer: The hertz is the unit of measure for this and is equal to one
cycle per second (Hz)
●● What is the unit of measure for sound intensity, based on a
logarithmic scale?
Answer: The decibel (dB) is the unit of measure for this.
●● What do most people perceive when a sound increases by 10 dB?
,Answer: When a sound increases by this amount, most people perceive a
doubling in loudness.
●● What frequency range can be heard by most healthy young people?
Answer: This range is 20 Hz to 20,000 Hz.
●● What is the coefficient of absorption?
Answer: This is the ratio of the sound intensity absorbed by a material to
the total sound intensity reaching the material.
●● What is the noise reduction coefficient (NRC)?
Answer: This is a single-number average of a material's coefficients of
absorption at 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz, rounded to the
nearest 0.05.
●● What is reverberation time?
Answer: This is the time it takes for the sound level in a space to
decrease 60 dB after the source has stopped producing the sound.
●● What is the ceiling attenuation class (CAC)?
Answer: This is a single-number measure of the transmission loss
through ceiling tiles between two closed rooms where there is no barrier
above the suspended ceiling.
,●● What percentage range of a commercial building's total energy use is
typically devoted to electric lighting and the cooling it requires?
Answer: 30% to 40% of a commercial buildings total energy use is
typically devoted to this.
●● What are the 3 most common types of interior glazing?
Answer: The 3 most common types are: Float, Tempered, and Laminated
●● What are the primary elements used to make bronze?
Answer: Copper and tin are used to make this material.
●● What is a concrete masonry unit?
Answer: This building product, abbreviated CMU, is also commonly
known as concrete block.
●● What is mean radiant temperature?
Answer: This is a measure of the heat a person gains from or loses to his
or her surroundings through radiation. It is used in assessing how
comfortable a room is.
The value is a weighted average of the various surface temperatures in a
room (taking into account an occupant's angle of exposure to these
surfaces) and any sunlight present.
, ●● What is the standard depth of metal studs?
Answer: Standard depth for these construction components are 1 5/8", 2
1/2", 3 5/8", 4", and 6" (41, 64, 92, 102, and 152 mm)
●● What is the generic name for fire-rated gypsum wallboard?
Answer: Type X is the generic name of this material.
●● What are 4 advantages of using Portland cement plaster as a finish
material?
Answer: As a finish material, this has the advantages of being:
- hard and abrasion resistant
- water resistant
- easily formed into curves and ornate surfaces
- a good base for wall tile
●● What are 4 disadvantages of using portland cement plaster as a finish
material?
Answer: As a finish material, this has the disadvantages of being:
- more expensive than gypsum wallboard
- slower to construct than gypsum wallboard
- wet and messy to work with
- challenging to work with, this requiring more-skilled labor
