21. The length of wedge used in slot and wedge type bolt
22. One mega pascal is equivalent to
23. The compressive strength of most of the rocks is greater than,
24. Arch supports are made of
25. Pay load means
26. Multi point extenso meter used for measuring
27. The drilling of vertical holes in roof and fixing bolts bolls grip the strata and to support immediate roof called
28. The diameter of old wire ropes, employed for roof stitching.
29. The process which involves reacting the ore with liquid solvent that will dissolve the mineral at low or moderate temperature and pressure is called
30. The filler in capsule bolting consists
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