Mining Engineering · all questions

Coal Mining
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Q241

Wary undulations developed in rocks, whenever the region is subjected to severe pressure

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Q242

While working seams steeper than 1 in 4 except the haulage dip the cross connections between the levels should be

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Q243

Diamond drilling is applicable upto a maximum depth of . . . . . . . . m.

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Q244

In deciding the size of the panel the important factor to be considered is

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Q245

The collapse of roof in the goaf which is delibarately brought about by withdrawal of roof supports called

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Q246

Room and pillar method used, when

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Q247

The holes in BG method are inclined . . . . . . . . degrees from vertical towards roof

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Q248

Length of simple unit face commonly with AFC.

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Q249

Speed of wireline drilling equipment is

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Q250

During depillaring, no splitting or reduction of pillars should be done beyond a length of pillars ahead of . . . . . . . . pillar under extraction.

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Q251

The gradient of the cross cut should not be less than

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Q252

Submerged sand deposit can be mined by

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Q253

Maximum compressive strength of cavable roof is

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Q254

Coal seams said to be contiguous, if the two seams are separated by a parting of less than.

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Q255

The portion of the face at its end. Where cutting starts

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Q256

The type of lining employed where high pressure of water to be resisted in a sinking pit

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Q257

The stowing efficiency in hydraulic sand stowing is

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Q258

The number of pillars in a panel, can be extracted to the maximum percentage in depilling with in the . . . . . . . . period.

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Q259

For deeper mines the sand : water ratio in sand stowing is . . . . . . . .

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Q260

Usual length of drill rods

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