ACOUSTICS INDIA PRIVATE LTD - NOISE POLLUTION CONTROL DIVISION

NOISE CALCULATIONS

1) Question:

The Noise level measured at a distance of
meters from a noise source is
dBA. What will be the noise level if
measured at a distance of
meters from the same noise source?.

Answer :
dBA.

2) Question:

In a noisy machine building
/ plant 'n' number of noisy machines are in operation. The table
below indicates the noise level of individual machine. What will
be the overall noise level if 'n' number of machines run at a
time?.

Machine No.

Individual Machine
Noise when it runs alone

1

(dBA)

2

(dBA)

3

(dBA)

4

(dBA)

5

(dBA)

6

(dBA)

7

(dBA)

8

(dBA)

The overall noise level when all the above
machines run at a time
dBA

3) Sound Power Energy Calculation:

Calculate equivalent energy for the given
Sound Power Level (SWL) in dB.