61. What should be the minimum floor area of every shelter as per the Mines Rules, 1955?
62. Name the method which involves partial combustion of coal with the objective to extract thermal energy from the coal seam
63. In sampling, a part is collected to represent the total set of observation. Use any single word from the following to replace "total set of observation"
64. Optimum rate of stone dusting in underground coal mines is
65. In underground, from the footwall shaft cross-cuts are drawn to intersect the orebody and raises are made to connect the cross-cuts. The top of the raises are widened. Name the method of extraction.
66. Maximum number of faces possible in a 6 heading B & P district is
67. The wt% of solids in a sand-water stowing pipe is 60. If the solids density is 3000 kg/m3, the pulp density of the slurry in kg/m3 is
68. What will be relation between the side abutment pressure and Young's Modulus of the main roof after weighting?
69. 20 plain detonators in series, each of 2d resistance, are fired by a DC exploder supplying a current of 1.25 A. If 250 mJ energy is spent to fire the detonators, the time required in millisecond after detonator initiation is
70. One of the main criteria to decide the size of Panel for depillaring is
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