Question 1: (1 point) t conducting a noise survey of an industrial plant with nu

Question

Question 1: (1 point) t conducting a noise survey of an industrial plant with numerous machines, you need to determine the sound power radiated from an exhaust stack mounted on a roof. Unfortunately when you stand of the roof to measure the SPL rom the exhaust stadk you are sure there are a number of other noise sources that would contaminate your estimate of the sound level trom stack You convince the plant operator to tun offthe fan that is radiating noise out of the exhaust stack the exhaust Using your sound level meter you measure - the noise level on the roof with with all the machines operating, s 104.4 dB re 20 micro-Pa only the noise from the exhaust stack is switched off and the other machines are operating, you measure 97 4 dBre 20 micro-Pa What s the sound pressure level nadiated by ytheeshaust stack esdudng the backoround nolsesources? Your answer must be accurate to within 0.1 dB

Explanation / Answer

Given data:

the noise level on the roof with all the machines operation(including exhaust stack noise)=104.4 dB

Noise level of the all other machine's operation except exhaust stack noise=97.4 dB

Solution step:

Noise level or sound pressure level(SPL) of exhaust stack=(the noise level on the roof with all the machines operation(including exhaust stack noise)-Noise level of the all other machine's operation except exhaust stack noise)

So, Noise level or sound pressure level(SPL) of exhaust stack=(104.4-97.4) dB=7 dB Ans.

Note: Sound Pressure Level(SPL) is sound intensity referenced to 20 micro-Pa (re 20 micro-Pa), which is auditory thershold of a healthy young person.

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