Mining Engineering · all questions

Coal Mining
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Q201

Heavy roof fall even premature collapse may take place if line of goaf is

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Q202

Gallaries which are heightend, widended should be supported by row of props . . . . . . . . meter aparts and chocks . . . . . . . . meter apart.

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Q203

Drilling with manual labour without help of power is suitable upto a depth of

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Q204

The life C.I. pipes used in sand stowing is . . . . . . . . lac ton of sand.

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Q205

Underground water emerging on surface in form of seepages and springs found to form loose superfical deposits of calcium carbonates called

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Q206

Which type of drill bit suitable for highly sillceous rock

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Q207

In B.G the full thickness of the seam can be extracted in one lift with percentage of recovery upto . . . . . . . .

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Q208

Length of holes drilled by jumbos vans from

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Q209

Spiral warm is used for removing

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Q210

The fall which takes place soon after withdrawal of supports called

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Q211

Speed of rotation in saw toothed drilling

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Q212

While working contiguous seams ventilation may be through

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Q213

Ventilator used in sinking shaft commonly with a capacity of

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Q214

The method of drilling not belongs to Rotory drilling

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Q215

The thickness of thickest seam in India is in meters.

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Q216

Each drill consumes nearly . . . . . . . . of free air per minute work at time in 6 m diameter shaft

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Q217

Any excavation made or being made in a mine for search of or obtaining coal called

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Q218

Construction of brick wall is carried out from with the help of . . . . . . . . in permanent lining.

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Q219

The goaf subsidence can be reduced to about . . . . . . . . of the amount caused by caving in hydraulic stowing.

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Q220

The curb rings are made of

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