A sealed area known to have black damp has 18% O2, 2% CO2, and 78% N2. If fresh air has 21% O2, 0.03% CO2 and 78.97% N2, the percentage of black damp in the are is
A. 10.31
B. 12.28
C. 12.31
D. 14.28
Answer: Option B
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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