The mean velocity of air current through an airway of 9m2 cross-sectional area is found to be 1.5 m/s, If the mean methane content of air current is 0.6%, the layering index will be
A. 3.10
B. 2.71
C. 2.15
D. 1.80
Answer: Option A
This Question Belongs to Mining Engineering >> Mine Ventilation
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