Building Utilities 3 (FINALS Reviewer) Exam Questions and Answers

Building Utilities 3 (FINALS Reviewer) Exam Questions and Answers Timbre -Answer-The characteristic quality of sound that distinguishes one voice or musical instrument another or one vowel sound from another; determined by the harmonics of the sound and distinguished from the intensity and pitch. TRUE -Answer-(T/F) The sound-pressure level of a simple tone in a diffuse sound field varies from point to point with a theoretical standard deviation of 5.57 dB. This variability affects the timbre of complex tones in reverberant sound fields. Doppler Effect -Answer-_______________________________ can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding. A440 or A4 -Answer-___________ or ______________ which has a frequency of 440 Hz, is the musical note A above middle C and serves as a general tuning standard for musical pitch. Intensity -Answer-___________________ = Power / Area 1. Decoupling 2. Damping 3. Mass 4. Absorption 5. Resonance 6. Conduction -Answer-Sound isolation involves six basic principles: Decoupling -Answer-The basic definition of _________________ is to separate objects. Resilient clips, resilient channel, double stud and staggered stud framing are the different ways to decouple a wall or ceiling. ___________________ will always be the best way to isolate both walls and ceilings from the lowest to highest frequencies. Damping -Answer-Many things can be _______________ including walls, ceilings, floors, pipes, sheet metal, doors, isolation boxes, basically anything with low mass that will vibrate from sound transfer. The concept of _____________ is to convert sound vibrations to nonperceptible amounts of heat. Conduction -Answer-This sound principle is often referred to as flanking. Essentially vibrations from sound transmitting through conductive materials into other conductive materials, e.g. wood framing, plumbing pipes, and sheet metal. This sound transmission is indirect, so the loss from the transmission is difficult to predict, but can be significant. You can break the transmission of sound through conduction by either decoupling the materials or damping the materials. Ultrasound -Answer-_____________________is sound waves with frequencies higher than the upper audible limit of human hearing. Noise Reduction Coefficient (NRC) -Answer- ______________________________________is a single number method of rating the sound absorbing effectiveness of an acoustical material. It is defined as the arithmetic average of the material's measured sound absorption coefficients at the 250Hz, 500Hz, 1000Hz and 2000Hz octave bands. 1.00 -Answer-The NRC of the open window would be _________ which is th