71. The best method of mining in seam of 4.8 m thick, 500 m deep and massive sand stone roof.
72. In sand stowing incorrect profile will effect
73. The holes to be treated with chemicals known as
74. The percussive drilling is applicable upto a maximum depth of . . . . . . . . m.
75. The water bearing quality of seam is measured by the
76. In hydraulic sand stowing the throw of the sand without nozzle is . . . . . . . . m and with nozzle is . . . . . . . . m.
77. The purpose of boring is
78. The pressure on diamonds is between during drilling
79. Chilled shot drilling suitable for drilling vertical and large diameter holes of
80. Deviation may occur in a hole of small depth as . . . . . . . .
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