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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 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?

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 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?

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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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 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?
Transcribed Image 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?
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