What should be the minimum floor area of every shelter as per the Mines Rules, 1955?
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Mining Engineering · all questionsIntroduction to Mining Engineering
Introduction to Mining Engineering
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Name the method which involves partial combustion of coal with the objective to extract thermal energy from the coal seam
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In sampling, a part is collected to represent the total set of observation. Use any single word from the following to replace "total set of observation"
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Optimum rate of stone dusting in underground coal mines is
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In underground, from the footwall shaft cross-cuts are drawn to intersect the orebody and raises are made to connect the cross-cuts. The top of the raises are widened. Name the method of extraction.
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Maximum number of faces possible in a 6 heading B & P district is
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The wt% of solids in a sand-water stowing pipe is 60. If the solids density is 3000 kg/m3, the pulp density of the slurry in kg/m3 is
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What will be relation between the side abutment pressure and Young's Modulus of the main roof after weighting?
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20 plain detonators in series, each of 2d resistance, are fired by a DC exploder supplying a current of 1.25 A. If 250 mJ energy is spent to fire the detonators, the time required in millisecond after detonator initiation is
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One of the main criteria to decide the size of Panel for depillaring is
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A 2.5 m thick coal seam lying at an average depth of 100 m has been developed by bard and pillar method. The width of the square pillars is 30 m (centre to centre) and the gallery width is 4 m. The average density of the overlying strata is 26 kN/m3 and the pillar strength is 4500 kN/m2. Extraction ratio during the development of the pillar is
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Soutirage mining is the alternative name of
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In room and pillar mining multiple faces are advanced but driving entries or rooms follows a definite pattern known as
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What is the minimum size of coal pillar when the depth of coal seam from surface remains between 240 m to 360 m and gallery width does not exceed 3 m?
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A haul ramp of 6% grade is to be constructed connecting a bench of 15 m height to the surface. If the cost of ramp construction is 1 million rupees per km, the cost of this ramp construction in million rupees will be
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What is the standard of lighting required for the workplace of HEMM's of opencast mine?
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Ratio of water and emulsion in hydraulic fluid is
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Ring pattern drill holes are provided in
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What will happen if a Booster fan is placed too far inbye of the neutral point in either intake or return?
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A developed panel for a coal seam having incubation period of 6 months has 32 square pillars under extraction having size 25 m and height 3.0 m. Density of coal is 1.4 tonne/m3. Extraction ratio during depillaring is expected to be 75%. To depillar the panel within the incubation period, assuming 25 working days in a month, the production from the panel in tonne/day is
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