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Mining Engineering Mine Ventilation Difficulty: Medium

The formula for calculating density of air in D.C shaft.

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In thick seam when its thickness is equal to or more than . . . . . . . . m in Indian coal seams. What is the purpose of a refuge chamber in underground mines? A mechanical mixture of extinctive gases carbondioxide and excess nitrogen reffered as Oxygen flow rate in the self contained breathing apparatus Proto Mark IV is A gas mixture contains CH 4 , C 2 H 6 and H 2 with respective concentration of 75%, 15% and 10% by volume. The lower explosibility limit of CH 4 , C 2 H 6 and H 2 are 5.0%, 3.3% and 4.2% respectively. The lower explosibility limit of the gas mixture, in percentage, is