Q261
Open question'Drop-war-wick' is used in u/g haulage track as a means of
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Mining Engineering · all questionsIntroduction to Mining Engineering
Introduction to Mining Engineering
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Q262
Open questionIn ultimate pit analysis the most widely used method is
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Q263
Open questionMethanometer works on the principle of
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Q264
Open questionThe cap lamp used by the miners is
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Q265
Open questionSix 100 w bulbs at a distance of 6 m gives a lighting of
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Q266
Open questionAn underground panel in a coal mine is being developed on B & P system. The pillar size is 30 m centre to centre and the adjacent galleries are 4 m wide. The percentage of extraction during development is
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Q267
Open questionThis method is used for mining narrow veins or pay streaks, where the ore occurs as a distinct band and can be separated easily from the wall rocks. The method of mining is known as
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Q268
Open questionMarch the following:
| Mining Method | Operation |
| a. Bord and Pillar | 1. Long hole radial drilling |
| b. Sublevel caving | 2. Splitting and Slicing |
| c. Longwall retreating | 3. Loosening under strata pressure |
| d. Integrated Caving | 4. Mechanical cutting |
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Q269
Open questionPrior to starting opencast working some trenches are excavated to expose the mineral body. These trenches are generally very long but limited in depth. What is its approximate depth?
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Q270
Open questionWith low setting pressure
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Q271
Open questionFor what depth of coal seam from surface, the distance between centers of adjacent pillars shall not be less than 45 m for a gallery width of maximum 4.8 m?
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Q272
Open questionThe flow rate of water in hydraulic mining for coal should be at least A gallon per minute. A is given by
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Q273
Open questionDilution in sublevel caving is
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Q274
Open questionHow much quantity of air should be conducted up to each face where solid blasting is practiced?
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Q275
Open questionThe method of mining a coal seam 8.5 m thick is by
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Q276
Open questionAmong the following options, the specific energy for rock-drilling is lowest in
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Q277
Open questionExistence of fire in underground coal mine is established by
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Q278
Open questionA block ore between two levels 30 m apart is 40 m long. The ore body thickness, specific gravity and grade are 2 m, 2.8 and 2% respectively. The tonnage of copper available in the block of ore is
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Q279
Open questionFilling up of the void in opencast mines is known as
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Q280
Open questionIn connection with the precautions where gas exists, all apparatus, including portable and transportable apparatus used at any place within "A" meters of any workings or goaf in case of 3rd degree gassy mine. A is given by
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