91. The prop is errected in inclined seams
92. Square set support made of
93. The capsule bolt should not be loaded for the first . . . . . . . . hour.
94. Maximum unsupported span is related to excavation support ratio [ESR] and 'Q' of Barton's classification by the formulae.
95. Prop tightened by the lid against roof and floor by driving . . . . . . . . with hammer.
96. 40 × 40 m centre to centre size of coal pillar in bord and pillar working, at a depth of 280 m has 4 m wide gallans. What area of roof does a pillar support according to tributary area.
97. The fire proof supports are
98. The safe cover for surface required when caving employed, and on surface multistored building
99. Slot and wedge type bolt made of
100. For a frequency of vibration 3 - 300 cycle/sec the PPV safe for structure is
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