Q39
At a surface mine office the independent Sound Pressure Level (SPL) measured in dB(A) on account of 3 drill machines are 85,88 and 85. If all the three machines work simultaneously, the combined SPL, in dB (A) is
A.
91
AnswerB.
90
C.
92
D.
94
Answer: Option A
Solution
Answer: Option A
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