Mining Engineering · all questions

Introduction to Mining Engineering
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Q241

What is the standard of lighting at pit bottom of Indian mines?

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Q242

The ground in central portion of the subsidence trough is subjected to

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Q243

V.C.R is a modified version of

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Q244

A surface miner with 2.0 m cutting drum width excavates coal in windrowing mode from a bench with effective face length 200 m. The cutting speed of the surface miner is 10 m/min and the cutting depth 25 cm. The density of coal is 1.4 tonne/m³. If the average turning time of the machine at the face end is 5 min, the rate of production in tonne/hour becomes

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Q245

The Draw point spacing in caving method is dependent on

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Q246

Water spraying at coalface before & after short firing is mandatory, why so?

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Q247

In which of the following thick seam mining method, roof sag and initiation of spon heating is maximum seen?

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Q248

Best suited mining method for thick vein/massive deposit with strong ore, strong walls and steep dip is

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Q249

Which of the following hazards is met when the roof exposure during depillaring operation becomes more than 90 m²

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Q250

When a double ended ranging drum shearer cuts coal in a longwall face,

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Q251

In Indian long wall mines, support resistance is calculated with due consideration to

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Q252

'Gravimetric Dust Sampler' is

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Q253

As per CMR 2017, the "Automatic Contrivance" shall be provided in each shaft exceeding a depth of

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Q254

The feasibility study of an opencast mine revealed the following:
Recoverable value per tonne of ore = Rs. 900
Production cost per tonne of ore = Rs. 550
Stripping cost per tonne of waste = Rs. 45
The break even stripping ratio will be

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Q255

Match the following in the context of Indian mining practice:

Equipment	Power source
a. Rocker shovel	1. Battery
b. Locomotive	2. Compressed air
c. Shearer	3. Electricity (Maximum voltage 6.6 kV AC)
d. Dragline (24 m³ bucket capacity)	4. Electricity (Maximum voltage 1.1 kV AC)

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Q256

The process of extraction of soluble metal compounds by reaction with acid or basic solvents or water is called

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Q257

Why the heavy type of stone dust barriers are located further from faces in a district

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Q258

In longwall caving, the thickness of immediate roof is calculated from

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Q259

An underground panel extracted in a coal mine has a strike length of 500 m. After subsidence survey, it was found that the length of a straight line between the extreme limits of the subsided area on surface is 593.2 m along the strike direction. The depth of the extracted panel from the surface is 100 m. The angle of draw for the overlying strata assuming identical subsidence on either side of the centre of the panel is

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Q260

When an underground gallery is driven, the equilibrium of pre-mining forces is disturbed and re-distribution of pressures takes place. This can be better-explained by

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