Face along the strike prefarable for stowing in seams dipping more than.
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Mining Engineering · all questionsCoal Mining
Coal Mining
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The water garland segments provided with outlet hole into which screwed a nipple for . . . . . . . . mm diameter drain pipe
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For retreating L/W and B. P workings, only suitable method of methane drainage is
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No. of drills employed in shaft sinking
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In India coal seams over . . . . . . . . m thick are considered as thick seams.
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Top most horizon of tertiary succession in Assam is known as
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How many coal seams belong to Barakar formation
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Drill rods made of
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The width of the rooms in room and pillar method may be
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The tunneling machine employed in hard rock should be
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The core (dia in mm) size obtained with NX size
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Match the following:
| 1. Thickseam Extraction | a. Double Unit Face |
| 2. Bord and Pillar Extraction | b. Jet Pearcing |
| 3. Longwall Face Development | c. Inclined Slicing |
| 4. Hydraulic Mining | d. Half Moon |
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The minimum distance between two sections should be if one working at floor and one at top.
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Depillaring operations conducted from dip to . . . . . . . .
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Room and pillar mining employed at depth below . . . . . . . . meters.
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The core sizes whose wire line drilling technique is adopted are for BX holes
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Barrier in between panels is preferably puncture at 'A' number of places. 'A' is given by
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Dewatering can be done by using the drill machines like
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Rock formed by errosion, weathering, transportation and ultimately deposition of pre-existing rock
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Maximum roof exposure for caving is
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