Q141
Open questionGenerally the depth of hole in shaft sinking
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Mining Engineering · all questionsCoal Mining
Coal Mining
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Q142
Open questionIn hydraulic sand stowing the pipe end should away from the dip of box is . . . . . . . .
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Q143
Open questionOne of the special methods of shaft sinking is
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Q144
Open questionNumber of buckets commonly used in shaft sinking process
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Q145
Open questionNumber of legs in derrick
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Q146
Open questionLining employed in case of water bearing strata containing water at high pressure
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Q147
Open questionThe thickness of one slice in multi section extraction of thick seams.
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Q148
Open questionWhich is used for raising and lowering rods of circular cross section
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Q149
Open questionThe method of sinking employed when there is a ground filling problem with considerable inflow of water upto a depth of 30 m
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Q150
Open questionBord and pillar method of mining of working cod is applicable in
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Q151
Open questionVertical shaft does not extend upto the surface called
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Q152
Open questionThe hydraulic sand stowing the goaf is adopted and the face is along the strike it should be slightly oriented at to provide drainage of water.
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Q153
Open questionDuring extraction of coal the minimum thickness of rib left against the goaf is
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Q154
Open questionThe value of threshold convergence in longwall mining is mm/m.
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Q155
Open questionWith a good sand stone roof the area explored may not be more than . . . . . . . . m2 at one stook extraction.
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Q156
Open questionMud bucket not necessary when supply of flushing water
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Q157
Open questionFirst indication of roof weighting for regular fracturing roof in goaf.
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Q158
Open questionThe size of bricks generally construction of brick well are
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Q159
Open questionVelocity of slurvy instowing has to be kep at a minimum of . . . . . . . .
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Q160
Open questionFor rotory drilling the drill rods are . . . . . . . . section
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