51. The core (dia in mm) size obtained with NX size
52. Match the following:
1. Thickseam Extraction
a. Double Unit Face
2. Bord and Pillar Extraction
b. Jet Pearcing
3. Longwall Face Development
c. Inclined Slicing
4. Hydraulic Mining
d. Half Moon
| 1. Thickseam Extraction | a. Double Unit Face |
| 2. Bord and Pillar Extraction | b. Jet Pearcing |
| 3. Longwall Face Development | c. Inclined Slicing |
| 4. Hydraulic Mining | d. Half Moon |
53. The minimum distance between two sections should be if one working at floor and one at top.
54. Depillaring operations conducted from dip to . . . . . . . .
55. Room and pillar mining employed at depth below . . . . . . . . meters.
56. The core sizes whose wire line drilling technique is adopted are for BX holes
57. Barrier in between panels is preferably puncture at 'A' number of places. 'A' is given by
58. Dewatering can be done by using the drill machines like
59. Rock formed by errosion, weathering, transportation and ultimately deposition of pre-existing rock
60. Maximum roof exposure for caving is
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