The mine air should not contain less than . . . . . . . .% of O2 and . . . . . . . .% CO2.
A. 19, 0.5
B. 18, 0.4
C. 17, 0.5
D. 21, 0.5
Answer: Option A
This Question Belongs to Mining Engineering >> Mine Ventilation
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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