Q341
Open questionWhich of the following is most suitable for opening up an underground mine?
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Mining Engineering · all questionsIntroduction to Mining Engineering
Introduction to Mining Engineering
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Q342
Open questionThe blasting technique used for controlled throw of overburden is known as
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Q343
Open questionExploration means
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Q344
Open questionA bord and pillar panel will be developed with square pillars of size 25 m and an extraction ratio of 30%. The width of the gallery in m is
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Q345
Open questionWhy do we close the stoppings on intake & return airways simultaneously?
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Q346
Open questionMinimum air velocity required at long wall face is
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Q347
Open questionBreaking of coal in 'Hydraulic mining' is done by
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Q348
Open questionWhich metal is used for the purpose of Capping of Winding ropes?
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Q349
Open questionWhich of the following method is applicable to both metallic and non-metallic minerals?
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Q350
Open questionWhere seam thickness is more than 8 m and regular, dip < 60°, roof & floor is strong and coal is not liable to spon heating with easily cavable roof. Which of the following method is suitable?
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Q351
Open questionThe ratio of weight per unit volume of solid rock mass in the bench and weight per unit volume of loose rock mass after blasting or loosening is called
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Q352
Open questionIt is the mining method in which masses, panels or block of ore are undercut to induce caving, permitting the broken ore to be drawn off below
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Q353
Open questionRisk of premature collapse and over-ridding of pillars are maximum with
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Q354
Open questionDanger of air blast is maximum with
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Q355
Open questionIn a coal mine the depth of working is 200 m from surface, width of galleries 3 m, height of galleries 3 m and distance of square pillars between centres of bords is 22.5 m. What is strength of the pillar
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Q356
Open questionA surface mine blast design has 9 holes in a row, each of 8 m length and 200 mm diameter. The spacing and burden are 6 m and 5 m respectively. The length of subgrade drilling is 1 m and the density of in-situ rock is 2.43 t/m3. Assuming no back break, the output per blast in t is
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Q357
Open questionWagon drill working at minimum compressed air pressure of
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Q358
Open questionIt is a solid block of coal surrounded on all its side by galleries. Identify it
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Q359
Open questionCrown Pillar is
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Q360
Open questionApart from mining of coal, the longwall mining method has been practiced for mining the deposits of
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