21. In blast stower; the drum driven at a speed.
22. Optimum length of face for the consideration of the capacity of the face, machinery is determined on the basis of
23. It is international amociation which maintain drilling standards
24. Special methods of shaft sinking mainly classified in to . . . . . . . . types.
25. poH Broche process called
26. The stowing rate in mechanical sand stowing
27. Feed mechanism is not necessary beyond the depth of . . . . . . . . m.
28. Forced drop shaft method employed in
29. Drivage of two sets of roads and forming the pillar called . . . . . . . .
30. As a thumb rule the number of holes in a ring is . . . . . . . . times the diameter of ring in meters
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