In cat II and III degree gassy mine, major consideration to decide the quantity of air going u/g is the rate of emission of gas, should be diluted by ventilating air, that is percentage not more than . . . . . . . . in the main return air way of mine.
A. 0.3
B. 0.5
C. 0.8
D. 0.1
Answer: Option B
This Question Belongs to Mining Engineering >> Mine Ventilation
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