41. Freezing process introduced in the year
42. What is the meaning of SWL in material handling
43. For employing the French method of extraction of thick seams, seam gredient should not exceed.
44. Main fall occurs when the area of extraction is nearly equal or more than of the depth.
45. Sliding bolts are provided in
46. Wooden planks made of
47. In shallow mines, to prevent breathing of air to the depillared area through cracks on surface, the cracks are blanketted with a layer of sand nearly . . . . . . . . meters thick.
48. The saw toothed crown, drill holes of diameter not less than . . . . . . . . are possible.
49. Sand bunkers have a capacity of . . . . . . . . days requirements of sand.
50. Most common length of face in longwall mining.
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