The wattage of bulb in a cluster of each bulb
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Mining Engineering · all questionsCoal Mining
Coal Mining
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The required water for 1 ton of sand in hydraulic sand stowing is . . . . . . . .
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The purpose of pilot hole in stable pit drivage
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Scaffold not required in . . . . . . . . tubbing
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Bord and pillar method applied when a seam is
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The following method practiced in NECL (Assam) for extraction of steep thick seam.
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Transportation of filled material with water to the worked out areas for filling called . . . . . . . .
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In double tube core barrel which tube is non rotating
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The face or working place which is parallel to main cleat is called . . . . . . . .
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With 3 or 4 stooks under extraction at a time, the total area should not exceed . . . . . . . . m2
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Horizontal slicing method applied if seam thickness is
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The type of sinking employed in unstable friable strata with heavy rush of water
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Seam thickness more than 8m and regular dip <60°, strong roof and floor, no self heating with easily cavable roof. Select best method.
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The cut coal is loaded by . . . . . . . . In case of shear.
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The groove made by coal cutting machine is called
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On the mixing cone, there is a screen to prevent pebbles larger than . . . . . . . . mm size from getting into shaft range with sand water mixing.
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Hangers placed at intervals of
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The power available in under ground at a voltage of
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The coal mining areas where the maximum drilling depth is upto
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In longwall face cut by double back shuffle, can be only worked with
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