Q161
Open questionVibration test for the roof height not exceeding . . . . . . . .
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Mining Engineering · all questionsMine Supports and Strata Control
Mine Supports and Strata Control
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Q162
Open questionWhich type of prop is superior in yeilding type of props.
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Q163
Open questionOn 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.
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Q164
Open questionThe wooden piece placed on top of prop called
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Q165
Open questionAngle of internal friction of soil does not exceed
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Q166
Open questionAt what depth ratio of goaf in u/g, it causes maximum possible subsidence at more than one point in overlying ground surface.
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Q167
Open questionProp should always set on . . . . . . . . floor.
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Q168
Open questionOuter skin of capsule in capsule batting made of
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Q169
Open questionIt is the load on a prop at which the upper member begin to slide called
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Q170
Open questionLoad bearing capacity of soil can be improved by
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Q171
Open questionRock burst is explained by the theory of
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Q172
Open questionFor a bulking factor of 1.5, the height of immediate roof for extraction thickness of H is
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Q173
Open questionThe material used for make of hydraulic prop
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Q174
Open questionThe rock sample having 5.4 cm diameter and 2.7 cm thickness failed at a compressive load of 2403.45 kg while carrying out Brazilian test. The tensile strength of rock sample will be
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Q175
Open questionErecting the supports in such a manner that the distance between supports are according to a specified pattern called
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Q176
Open questionWide stall method of mining widely used in . . . . . . . . country.
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Q177
Open questionRocks said to be floggy if bedded planes are separated by
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Q178
Open questionVisual test is carried out if the roof is upto . . . . . . . . m from strong focussed beam of light.
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Q179
Open questionCoal India Limited was formed by Central Government in
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Q180
Open questionChasnalla disaster (1975) was due to
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