31. The thickness of tubbing plates increased after every . . . . . . . .
32. Half moon method of extraction of stooks will be employed when roof is
33. The thickness of isolation stopping in deg I gassy mine.
34. The upper portion of the sand stowing pipe is generally changed after the transport of . . . . . . . . lac ton of sand.
35. Mud bucket also called
36. A level roadway along the roof of the seam in level mining called . . . . . . . .
37. The average number of faces in the district if number of headings are Q.
38. Length of stowing pipes used in pneumatic stowing.
39. The number of stowing machines types are
40. Abutment load reaches its maximum value above . . . . . . . .
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