If the $$\frac{{CO}}{{{O_2}}}$$ deficiency ratio in a mine is 2%, it indicates
A. Existence of spontaneous heating
B. Active fire
C. Heating in advanced stage
D. None of the above
Answer: Option C
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
Join The Discussion