71. Double tube core barrel is suitable for rocks of
72. Hydrogenation invented in the year
73. During development the height of the gallery should not exceed
74. The strata through which shaft has to be sunk may be divided into . . . . . . . . groups.
75. Longwall advancing stables are usually . . . . . . . . ahead of the face.
76. The undue swinging of the bucket during its travel can be prevented by means of
77. Best method of mining in seam of 8.5 m thick.
78. Roof is easily cavable if proto dyakor index is
79. Permanent lining generally not required where the shaft are
80. The gallaries driven through the pillar for forming stooks called . . . . . . . .
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