41. Calorific value of bituminus coal rams from
42. In case of props employed for side supports, they should be set an angle of . . . . . . . . off the vertical, and feet well sunk in to the floor.
43. It is used to fit the prop in to stamp hole in the floor of the seam steeper than
44. The shear forces, intensity is heighest when the coal and floor beds are
45. The portion of the face at its end from where cutting starts called
46. Angle of draw is
47. The subsidence that continues to occur after the compleating of depillaring known as . . . . . . . .
48. The crushing generally seam on . . . . . . . . pillars.
49. Origin of Indian coal seams on the basis of mode of accumulation can be explained by
50. In L/W mining advance supporting of gate roads upto 30 m from the face required due to . . . . . . . .
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