51. The contribution of tertiary coal is about, what percent of the country coal resources is about.
52. In extraction of coal pillars by caving, what should be the maximum area of roof exposure at any working place at any time.
53. Consider that pillar size is 30 m centre to centre and gallaries are 4 m wide. Find the percentage of extraction.
54. The input of water in the mixing cone is measured or calculated by an instrument . . . . . . . .
55. The device used for collect the core
56. The pillars formed during development are split into small portions called . . . . . . . .
57. Kaolinite chemical is used for
58. In longwall advance workings, nearly . . . . . . . . te of sand per te of coal raised is required.
59. Calyx drilling also called as
60. Conveyor which receives coal from the face conveyor for its transport outbye is
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