Write the rank of coal in terms of increasing moisture content.
[3 marks]Explain the term shaft, Incline and Adit with neat sketch.
[4 marks]Discuss panel system of mining with neat sketch? How panel size is decided in Bord and Pillar method of working? Explain briefly.
[7 marks]Name the subsidiary of coal India limited (CIL) with their headquarter name.
[3 marks]Explain the basic principle of bord and pillar method with neat sketch.
[4 marks]Discuss the method of development of bord and pillar mining by blasting off the solid. Also draw the sketches of patterns of blast holes.
[7 marks]Discuss the procedure to establish the design of a new longwall face or district.
[7 marks]Write the applicability conditions of longwall method of mining.
[3 marks]Explain theories of origin of coal in detail.
[4 marks]Calculate number of pillar in the panel if output per day from the panel is 340 tonnes, number of working days in a month is 26, incubation period of coal seam is 6 month and percentage recovery in the panel is 78 %. Assume width of square pillar is 22.5 m, height of pillar is 3 m and density of coal is 1.4 tonnes/m3.
[7 marks]When do we need to support mines and why?
[3 marks]What are the variants of longwall face layouts? Explain with neat sketch.
[4 marks]Discuss the principles of pillar extraction techniques? Also Explain the pillar extraction techniques with neat sketch.
[7 marks]Draw a neat sketch of a longwall face & name the elements.
[3 marks]How factor of safety of pillar is determined? Explain with one example.
[4 marks]Explain longwall retreating and advancing method with neat sketch. Also write the advantages of longwall mining.
[7 marks]What are the ideal characteristics of stowing material used in stowing?
[3 marks]How to calculate percentage of extraction during development & depillaring? Explain with one example.
[4 marks]Discuss the process of hydraulic stowing with a neat sketch.1
[7 marks]Write the classification of coal seam as per thickness, Depth and Inclination.
[3 marks]State the advantages and disadvantages of mechanical stowing.
[4 marks]Discuss the operations involved & facilities provided in a mixing chamber of sand stowing.
[7 marks]What do you mean by cyclic and non-cyclic operations?
[3 marks]What do you understand by roof bolting? Also explain its principle of action and functions.
[4 marks]Give a brief idea about hydraulic and friction props.
[7 marks]