For Indian coal mines, the 'maximum allowable concentration' of respirable dust containing 7.5% free silica in mg/m3 is
A. 2
B. 2.2
C. 2.5
D. 2.7
Answer: Option A
Related Questions on Mine Ventilation
The mechanical mixture of gases existing in a mine given off after explosion called
A. White damp
B. Stink damp
C. Black damp
D. After damp
A Drager Gas Mask does not filter
A. Water vapour
B. Nitrous fumes
C. Carbon monoxide
D. Carbon dioxide
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