Q221
Open questionThe stowing efficiency in penumatic stowing is
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Mining Engineering · all questionsCoal Mining
Coal Mining
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Q222
Open questionBroken working referred as
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Q223
Open questionThe hydraulic prop built up its full bearing load with an yield less than . . . . . . . . cm.
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Q224
Open questionThe roof fall which is not extended to surface
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Q225
Open questionThe parting between two horizons must not be less than . . . . . . . .
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Q226
Open questionThe limit of depth use of screw feed mechanism
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Q227
Open questionThe section of the curbing segments are
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Q228
Open questionJack hammer operates at an air pressure of nearly
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Q229
Open questionIn a gallery of 4.2 m width and 2.1 m height and 1 m depth, sp.gr. of coal is 11; the coal available for blast is for four rounds of solid blasting.
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Q230
Open questionReduce the friction of the rock to the passage of cement certain types of rocks
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Q231
Open questionThe thickness of tubbing plates increased after every . . . . . . . .
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Q232
Open questionHalf moon method of extraction of stooks will be employed when roof is
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Q233
Open questionThe thickness of isolation stopping in deg I gassy mine.
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Q234
Open questionThe upper portion of the sand stowing pipe is generally changed after the transport of . . . . . . . . lac ton of sand.
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Q235
Open questionMud bucket also called
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Q236
Open questionA level roadway along the roof of the seam in level mining called . . . . . . . .
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Q237
Open questionThe average number of faces in the district if number of headings are Q.
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Q238
Open questionLength of stowing pipes used in pneumatic stowing.
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Q239
Open questionThe number of stowing machines types are
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Q240
Open questionAbutment load reaches its maximum value above . . . . . . . .
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