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NCIDQ IDFX - TOPIC 7 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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NCIDQ IDFX - TOPIC 7 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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NCIDQ IDFX - TOPIC 7 QUESTIONS ANDANSWERS WITH SOLUTIONS 2024
What is a safety data sheet (SDS)? - ANSWER This is a document provided by a manufacture containing
information about the physical make up of a substance, proper storage and handling procedures, and
other safety issues.
What is a composite wood veneer? - ANSWER This is a 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.
What is a clerestory? - ANSWER This is a vertically glazed area placed between two different roof levels
to admit natural light.
What is the unit of measure for the frequency of sound? - ANSWER The Hertz (Hz) is the unit of measure
for this and is equal to one cycle per second.
What is a unit of measure for sound intensity, based on the logarithmic scale? - ANSWER The decibel
(dB) is the unit of measure for this.
What do you most people perceive one sound increases by 10 dB? - ANSWER When it 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 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 buildings 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 three most common types of interior glazing? - ANSWER The three most common types
are
float
tempered
laminated
What are the primary elements used to make bronze? - ANSWER Copper and tin are used to make this
material
What is a concrete Masonary unit? - ANSWER This building product, abbreviated CMU, is usually
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 are the standard depths of metal studs? - ANSWER Standard depths for these construction
components are 1 5/8", 2 1/2", 3 5/8", 4" and 6"
What is the generic name for fire rated gypsum wallboard? - ANSWER Type X is the generic name for this
material.
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