1.PART Fill in the bracket Question 1) If two sound sources produce sound pressure levels of 65 dB and 80 dB, their comb

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1 Part Fill In The Bracket Question 1 If Two Sound Sources Produce Sound Pressure Levels Of 65 Db And 80 Db Their Comb 1 (115.45 KiB) Viewed 121 times

1.PART Fill in the bracket Question 1) If two sound sources produce sound pressure levels of 65 dB and 80 dB, their combined level is dB. Question 2) also called impact noise, is produced when part of the building fabric is directly or indirectly impacted. Energy passes through the building structure and creates noise in nearby rooms. Examples are heavy footsteps (particularly on bare timber or tile floors), banging doors, scraping furniture, vibrations from loud music, and plumbing noise. Question 3) ...........concentrates sound into one direction and location, starving other locations of adequate sound. It is the opposite of diffusion. Question 4) If two lawn movers each produce a sound pressure level of 60 dB, their combined level is dB-definitely not 120 dB! 2.PART Choose & mark the correct answer Question 5) noise levels have more negative effects and are more annoyance. b) frequency a) low c) timbre d) High Question 6) The noise level inside a quiet living room is about. a) 60 dBA b) 10 dBA c) 0 dBA d) 90 dBA Question 7) A material's sound absorbing properties can be described as a particular frequency range. a) sound diffusion coefficient c) sound reflecting coefficient b) sound absorbing coefficient d) sound scattering coefficient Question 8) Which is not a structureborne sound? a) Impact noise. b) footsteps. c) vibration due to heavy vehicles d)violin sound 3.PART Choose true or false Question 9) Lux meter is an instrument consisting of a microphone, amplifier and indicating device, having a declared performance and designed to measure sound pressure levels. (True False) Question 10) It is shown the absorption coefficient of the material for six octave band frequencies below. It is a "panel absorber" type of material? 125 Hz The absorption coefficients of the material 250 Hz 1000 Hz 2000 Hz 0.21 0.08 0.07 500 Hz 0.11 4000 Hz 0.03 0.35 (True / False) Question 11) The number of pressure variations per second is called the frequency of sound. (True False) Question 12) Reverberation time calculations should be made for at least 4 octave bands. (True False) Question 13) Optimum Reverberation time depends on the size of the total absorbance and surface of the room. (True / False) in a