Q341
Open questionMinimum life of mine should be more than . . . . . . . . years for adopting horizon mining.
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Coal Mining
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Q342
Open questionIf the water bearing strata may have several feeders of water at various depths these are sealed by this lining
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Q343
Open questionThe . . . . . . . . holes left in brick wall at the curb level during their construction for escape of water called.
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Q344
Open questionThe relative distance between roof and floor in a vertical plane called
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Q345
Open questionDrop shaft methods are also called
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Q346
Open questionUsual thickness of brick lining vanes from
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Q347
Open questionShaft sides buttons are fixed at intervals of . . . . . . . . for support of cables, delivery pipes, etc.
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Q348
Open questionThe trend of coal production in India always been on increase except the year . . . . . . . . when production fall down, and packed up again slightly.
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Q349
Open questionThe type of boring suitable for drilling to a depth of 3000 m with a hole dia of 200 mm
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Q350
Open questionThe thickness of stowing pipes used in pneumatic stowing.
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Q351
Open questionBroken tools removed from drill hole by
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Q352
Open questionThe type of feed mechanism used for shallow drilling
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Q353
Open questionMain objectives of directional drilling
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Q354
Open questionHole made by rotating helical screw blade called
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Q355
Open questionDeflection techniques are usually adopted in
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Q356
Open questionThe type of shaft sinking employed in any fissured water bearing strata except running sand
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Q357
Open questionIn, development mine, at any place with a cover not less than
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Q358
Open questionIndian coal is characterised by
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Q359
Open questionShuttle cars are the transporting media for
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Q360
Open questionWire line drilling technique reduces the
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