At what percentage of black damp, the mine atmosphere becomes non explosive irrespective of % of fire damp.
A. 5%
B. 25%
C. 35%
D. 45%
Answer: Option C
This Question Belongs to Mining Engineering >> Mine Ventilation
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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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