FINANCIAL ACCOUNTING
FINANCIAL ACCOUNTING
10th Edition
ISBN: 9781259964947
Author: Libby
Publisher: MCG
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solve below all questions tqvm

p=1

q=9

r=0

s=1

t=7

u=0

If the two machines, M1 and M2 are turned off, and assuming that total sound
pressure level is 120 dB, analyze the sound pressure level of the background
noise (in decibels) and its mean square pressure (in N/m²) at the operator
position.
(ii)
If the data from Table Q2(b) is converted to octave band as shown in Table
Q2(c), examine the total sound pressure level in dB(A) and total mean square
....
(1i1)
pressure (in N/m²).
(iv)
Describe briefly three method to control the noise if the answer in Q2(b)(iii)
is SPL > 85 dB(A).
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Transcribed Image Text:If the two machines, M1 and M2 are turned off, and assuming that total sound pressure level is 120 dB, analyze the sound pressure level of the background noise (in decibels) and its mean square pressure (in N/m²) at the operator position. (ii) If the data from Table Q2(b) is converted to octave band as shown in Table Q2(c), examine the total sound pressure level in dB(A) and total mean square .... (1i1) pressure (in N/m²). (iv) Describe briefly three method to control the noise if the answer in Q2(b)(iii) is SPL > 85 dB(A).
Table Q2(c)
Level (dB)
Machine No.
A weighting (dB)
-8.6
-3.2
250
9P
500
8Q
1000
9R
2000
7S
1.2
4000
6T
1
8000
8U
-1.1
expand button
Transcribed Image Text:Table Q2(c) Level (dB) Machine No. A weighting (dB) -8.6 -3.2 250 9P 500 8Q 1000 9R 2000 7S 1.2 4000 6T 1 8000 8U -1.1
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