Q241
Open questionThe shaft should reach nearly . . . . . . . . m below the lowest bed to be worked to acommodates cheese weights of guide ropes.
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Mining Engineering · all questionsDrilling and Blasting
Drilling and Blasting
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Q242
Open questionAt the inlet of the mine roadway, the dry and wet bulb temperature of air are 38°C and 29°C, respectively. The corresponding temperatures at the outlet are 32°C and 29°C respectively. The process of heat transfer in the air way is described as . . . . . . . .
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Q243
Open questionTerm mine car used for tubs capacity more than, having ball bearings for mine car.
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Q244
Open questionThe factors have to be considered before selecting the site of shaft the site.
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Q245
Open questionHeavy barriers used at
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Q246
Open questionIn thick seams the thickness of coal in between.
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Q247
Open questionBooster having VOD of
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Q248
Open questionThe disadvantage of incline is . . . . . . . .
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Q249
Open questionThe permitted explosive used in underground in solid blasting of all gassy mins.
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Q250
Open questionSometimes a rod or chisel breaks in the drill hole during drilling. Name the device that may be used to catch the broken piece
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Q251
Open questionCapacity of face pump develops head of
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Q252
Open questionThe percentage of extraction of the depth of seam is 300 m and gallery width 4.2 m
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Q253
Open questionThe thickest coal seam in found in . . . . . . . .
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Q254
Open questionIt is estimated that in coal mine nearly . . . . . . . . te of air to a sent down in a mine for every te of coal raise.
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Q255
Open questionA place in a mine is not considered to be adequately ventilated if the fire damp percentage exceed . . . . . . . .
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Q256
Open questionThe synchronus induction motor has an advance of improving . . . . . . . .
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Q257
Open questionThe coefficient of friction measured in Germany . . . . . . . .
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Q258
Open questionAir velocities in diesel locomotive sheds and battery charging station should be not less than . . . . . . . . m/sec.
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Q259
Open questionUnless the two shafts are conected by under ground tunnel, no development work inside the mine is . . . . . . . . under law.
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Q260
Open questionFoam type extinguisher is not permitted to deal with class 'C' fires because
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