Q240
The exhaust air, below ground, which contains dust in excess of the permissible limit shall be efficiently diluted and if necessary filtered. So as to reduce the concentration of respirable dust there in below . . . . . . . . percent of the permissible limit before being recirculated into working place.
A.
5
B.
10
AnswerC.
15
D.
20
Answer: Option B
Solution
Answer: Option B
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