41. Methane drainage was first fried in the colliery in Ruhr coal field of . . . . . . . . in 1943.
42. CMRS has patented a H2S detector tube which detects . . . . . . . . ppm of H2S.
43. Methane can form a layer along the floor of the workings, if the density of the gas mixture more than
44. The percentage of methane present in mine air by volume.
45. Methane accumulates in mins in
46. DGMS has approved this type for use for all degree of gassy mines in coal.
47. Name the gas which is not dangerous
48. The liquid employed in Fortin barometer
49. The alarm range of BCO-1 CO detector . . . . . . . . of CO.
50. What is the minimum % of methane concentration a oil safety lamp can measure.
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