Exam (elaborations)
CAOHC_ Workplace Noise_ Measurement and Controls (1
- Course
- MIE 305 NCSU Chapters 1-4
- Institution
- MIE 305 NCSU Chapters 1-4
CAOHC_ Workplace Noise_ Measurement and Controls (1
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CAOHC: Workplace Noise: Measurement andControls
(3) What are the 3 charactersictics of sound? - ANS-1. Frequency
2. Amplitude
3. Temporal/Time
What is the unit of measurement for frequency? - ANS-Hertz or Kilohertz (Hz or kHz)
This is referred as pitch? - ANS-Frequency
(2) What are the descriptions of frequency? - ANS-1. high-pitched
2. low-pitch
This is a description of frequency when it's like a train whistle. - ANS-high-pitched sound
This is a description of frequency when it's like a rumble of thunder. - ANS-low-pitched sound
What is the description of sound when the frequency greater than 2000 Hz? - ANS-high-pitched
sound
What is the description of sound when the frequency less than 500Hz? - ANS-low-pitched
sound
This is referred as intensity or loudness? - ANS-Amplitude
What is the unit of measurement for Amplutude? - ANS-decibels (dB)
This can be described as "The louder the sound, the higher the decibel number". -
ANS-Amplitude
What is this that explains how sound changes over a period of time? - ANS-Temporal/Time
(6) What are the technical terms listed used for Temporal/Time? - ANS-1. Continuous
2. Steady/State
3. Intermitent
4. Varying
5. Impact
6. Impulse
What is this that explains amplitude like a jack hammer? - ANS-Intermittent sound
, This term in Temporal/Time is described as START STOP START - ANS-Intermittent sound
What is this that explains temporal/time like grinding? - ANS-Varying sound
What is the change in amplitude over time? - ANS-Varying sound
What is this that explains sound like a pile driver? - ANS-Impact or impulse sound
This is the sound that are intense but are short in duration lasting less than one second. -
ANS-Impact or impulse sound
This gives a different level of importance to each frequency. - ANS-Weighting networks
What are the main weighting networks? - ANS-1.A
2.C
3.Z
This mimics how the human ear percieves sound? - ANS-A-weighted network
This is the calculation of the hearing protector's noise reduction rating. - ANS-C-weighted
network
What does NRR mean? - ANS-Noise reduction rating
This is the unweighted across human hearing frequency range of 20 to 20,000 Hertz. -
ANS-Z-weighted network
What is the weighting network that is not weighted and is often referred to as the dB? -
ANS-Z-weighted network
What is mostly used for measuring impulse noise generated by the military or military like
weapons? - ANS-Z-weighted network
This is applied by the sound level meter according to the settings choosen. - ANS-Weighting
networks
How does most occupational noise data is presented? - ANS-dB(A)
This is because regulations require worker noise exposure to be measured on the weighting
scale? - ANS-dB(A)
What is the reason why we can't do arithmetic addition to decibels? - ANS-Decibels are
logarithmic
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