1) Noise was measured at a location in a factory and resulted in the octave band spectrum levels in the table below. Frequency- Hz 63 125 250 500 1K 2K 4K 8k Lp 100 101 97 91 90 88 86 81 (dB re 20...

1) Noise was measured at a location in a factory and resulted in the octave band<br>spectrum levels in the table below.<br>Frequency- Hz<br>63<br>125<br>250<br>500<br>1K<br>2K<br>4K<br>8k<br>Lp<br>100<br>101<br>97<br>91<br>90<br>88<br>86<br>81<br>(dB re 20 µPa)<br>Table 1<br>a) Calculate the A-weighted overall sound pressure level.<br>b) How many hours would a Malaysian employee be permitted to work at this<br>location?<br>c) What is the loudness level in Sones?<br>d) When one noisy machine is turned off, the A-weighted sound level at the<br>measurement location dropped by 1.5dB(A). What was the contribution (in dB(A)) of<br>this machine to the noise level at the measurement location?<br>

Extracted text: 1) Noise was measured at a location in a factory and resulted in the octave band spectrum levels in the table below. Frequency- Hz 63 125 250 500 1K 2K 4K 8k Lp 100 101 97 91 90 88 86 81 (dB re 20 µPa) Table 1 a) Calculate the A-weighted overall sound pressure level. b) How many hours would a Malaysian employee be permitted to work at this location? c) What is the loudness level in Sones? d) When one noisy machine is turned off, the A-weighted sound level at the measurement location dropped by 1.5dB(A). What was the contribution (in dB(A)) of this machine to the noise level at the measurement location?

Jun 11, 2022

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1) Noise was measured at a location in a factory and resulted in the octave band spectrum levels in the table below. Frequency- Hz 63 125 250 500 1K 2K 4K 8k Lp 100 101 97 91 90 88 86 81 (dB re 20...

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