Exam (elaborations)
NCIDQ IDFX – QUESTIONS AND ACCURATE ANSWERS
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NCIDQ IDFX – QUESTIONS AND ACCURATE ANSWERS
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NCIDQ IDFX – QUESTIONS AND ACCURATE ANSWERSWhat is a safety data sheet (SDS)? Right Ans - Document provided by a
manufacturer containing info about the physical makeup of a substance,
proper storage and handling procedures, and other safety issues.
Define composite wood veneer. Right Ans - 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. Right Ans - Vertically glazed area placed between 2
different roof levels to admit natural light.
What is the unit of measure for the frequency of sound? Right Ans - 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?
Right Ans - The decibel (dB) is the unit of measure for this.
What do most people perceive when a sound increases by 10 dB? Right Ans
- 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? Right
Ans - This range is 20 Hz to 20,000 Hz.
What is the coefficient of absorption? Right Ans - 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)? Right Ans - 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? Right Ans - 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)? Right Ans - 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? Right Ans - 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? Right Ans - The 3
most common types are: Float, Tempered, and Laminated
What are the primary elements used to make bronze? Right Ans - Copper
and tin are used to make this material.
What is a concrete masonry unit? Right Ans - This building product,
abbreviated CMU, is also commonly known as concrete block.
What is mean radiant temperature? Right Ans - 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? Right Ans - 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? Right Ans -
Type X is the generic name of this material.
What are 4 advantages of using Portland cement plaster as a finish material?
Right Ans - 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? Right Ans - 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
What is a pivot? Right Ans - This is a type of hardware used to hang doors.
It consists of a rotating bottom pin and a corresponding pin at the top of the
door.
In regards to construction, what is a plenum? Right Ans - In commercial
construction, this is the space between the building structural roof or floor
and the suspended ceiling
What effect does acoustical ceiling have on sound? Right Ans - This
construction element mainly absorbs sound.
Stainless steel is primarily an alloy of steel and an additional element. Which
one? Right Ans - Chromium is added to steel to create this material.
What process occurs when dissimilar metals are in contact in the presence of
water? Right Ans - The process that occurs under these conditions is
galvanic action.
Galvanic action is a form of electrochemical corrosion in which one metal
gives up electrons to the other, corroding quickly while slowing the other
metal's corrosion
What type of steel floor or roof framing system provides generous space in
both directions for pipes, ducts, and conduit? Right Ans - This is the
primary benefit of an open-web steel joist system.
What type of precast structural member is often used to provide support as a
beam and as floor decking? Right Ans - A double-tee is often used in these
two applications.
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