In an underground coal mine area the graham's ratio found 3% is the indication of
A. Existence of spontaneous heating
B. Active fire
C. Heating in advanced stage
D. Normal to the coal mine
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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