61. Vibration test for the roof height not exceeding . . . . . . . .
62. Which type of prop is superior in yeilding type of props.
63. On account of the weight of the rocks the pressure arch is transmitted to abutment if the depth of the seam is . . . . . . . . the length of the pressure.
64. The wooden piece placed on top of prop called
65. Angle of internal friction of soil does not exceed
66. At what depth ratio of goaf in u/g, it causes maximum possible subsidence at more than one point in overlying ground surface.
67. Prop should always set on . . . . . . . . floor.
68. Outer skin of capsule in capsule batting made of
69. It is the load on a prop at which the upper member begin to slide called
70. Load bearing capacity of soil can be improved by
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