11. Horizontal slicing method applied if seam thickness is
12. The type of sinking employed in unstable friable strata with heavy rush of water
13. Seam thickness more than 8m and regular dip <60°, strong roof and floor, no self heating with easily cavable roof. Select best method.
14. The cut coal is loaded by . . . . . . . . In case of shear.
15. The groove made by coal cutting machine is called
16. On the mixing cone, there is a screen to prevent pebbles larger than . . . . . . . . mm size from getting into shaft range with sand water mixing.
17. Hangers placed at intervals of
18. The power available in under ground at a voltage of
19. The coal mining areas where the maximum drilling depth is upto
20. In longwall face cut by double back shuffle, can be only worked with
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