Q121
Open questionThe warning signal to indicate approaching . . . . . . . .
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Mining Engineering · all questionsDrilling and Blasting
Drilling and Blasting
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Q122
Open questionFOR in term of mining field means
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Q123
Open questionA place is considered to be dangerous due to gas if it is . . . . . . . . or more.
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Q124
Open questionThe main disadvantage of run-round arrangement is . . . . . . . .
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Q125
Open questionCalculate the w.g produced by a 3.2 m diameter fan running at 280 rpm and delivering 7500 m3/min. of air, if the blades are radial, density of air 1.2 kg/m3.
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Q126
Open questionThe value of natural ventilation pressure is not considerably affected by
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Q127
Open questionSealed canisters have shelf life in gas mask is . . . . . . . . years.
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Q128
Open questionThe fittings in fire stopping are
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Q129
Open questionSmoke helmet made of tough . . . . . . . .
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Q130
Open questionDrivage along apparent dip is . . . . . . . .
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Q131
Open questionIf the fire is small, dire is dealt with, involves combustable material.
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Q132
Open questionThe bearing capacity of pillar is maximum for . . . . . . . .
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Q133
Open questionWhere the skip winding adopted the shaft should be sunk deeper by minimum of . . . . . . . . meter below the underground decking level, depending mainly upon the height of skip.
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Q134
Open question. . . . . . . . type of fan prefer to install fan in less space at surface.
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Q135
Open questionThe presence of . . . . . . . .% Hydrogen in methane eliminates the delay completely.
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Q136
Open questionCO/O2 deficiency ratio in coal mines in extream cases only it may be upto . . . . . . . .
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Q137
Open questionThe raising capacity of mine depends on . . . . . . . .
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Q138
Open questionSraper bucket capacity
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Q139
Open questionVentilation stoppings made of . . . . . . . .
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Q140
Open questionSpecific gravity of Nitroglycerene.
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