Analysis of the frequency of a noise is always important for evaluation purposes and adoption of correction or noise reduction measures. Thus, seve...

Analysis of the frequency of a noise is always important for evaluation purposes and adoption of correction or noise reduction measures. Thus, several noise evaluation curves (NC) are included in the Figure, through which a sound spectrum can be compared, allowing identification of the most significant frequency bands that need correction. Which of the following statements is true?

A-1.1 The NC curves are given in the Figure and the corresponding sound pressure levels are in Table 2.
A-1.2 The analysis of the octave bands of noise in the range of 63 Hz to 8,000 Hz must be determined with filters that comply with IEC 225.
A-1.3 In the use of NC curves, a tolerance of ± 1 dB is admitted with respect to the values (see Figure and Table 2).
Only statement A-1.1 is true.
Only statement A-1.2 is true.
Only statement A-1.3 is true.
Statements A-1.1, A-1.2, and A-1.3 are true.

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31/10/2023

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Ed

31.10.2023

A afirmação verdadeira é: "As afirmações A-1.1, A-1.2 e A-1.3 são verdadeiras". As curvas NC são apresentadas na figura e os níveis de pressão sonora correspondentes estão na Tabela 2. A análise das bandas de oitava de ruído na faixa de 63 Hz a 8.000 Hz deve ser determinada com filtros que estejam em conformidade com a IEC 225. No uso das curvas NC, é admitida uma tolerância de ± 1 dB em relação aos valores (consulte a Figura e a Tabela 2).

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