NCIDQ IDFX QUESTIONS AND ANSWERS 100% PASS

NCIDQ IDFX QUESTIONS AND ANSWERS 100% PASS What is a safety data sheet (SDS)? 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. 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. Vertically glazed area placed between 2 different roof levels to admit natural light. What is the unit of measure for the frequency of sound? 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? The decibel (dB) is the unit of measure for this. What do most people perceive when a sound increases by 10 dB? 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? This range is 20 Hz to 20,000 Hz. What is the coefficient of absorption? 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)? 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? 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)? 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? 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? The 3 most common types are: Float, Tempered, and Laminated What are the primary elements used to make bronze? Copper and tin are used to make this material. What is a concrete masonry unit? This building product, abbreviated CMU, is also commonly known as concrete block. What is mean radiant temperature? 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? 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? Type X is the generic name of this material. What are 4 advantages of using Portland cement plaster as a finish material? 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? 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? 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? 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? This construction element mainly absorbs sound. Stainless