The lower and upper limit of methane - air explosive mixture is
A. 0.75%, 1.25%
B. 5.4%, 14.8%
C. 5.0%, 15.0%
D. 5.9%, 12.5%
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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