81. In roof stitching face should not be advanced more than . . . . . . . . meters from the last tensioned rope:
82. Unit of blast induced vibration is
83. Hard coke, classified as Grade I, coke has ash percentage less than
84. Which of the subsidiaries of coal India Limited contributed on the top ranking profit making subsiding among it subsidiaries
85. The weight of the steel rail used for lying tracks
86. The Triaxial cell can test specimens upto . . . . . . . . long.
87. S.S.R. is framed for a distance upto . . . . . . . . meters of every development face.
88. Roadway rippings are dirts bands, shales used as support in mines as
89. Minimum thickness of lid . . . . . . . . placed over prop.
90. For fixing the cross bars holes are made in the coal pillar manually by using.
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