31. It is the part of cost of the fixed asset to the owner which is treated as loss in value of capital?
32. What is the minimum gradient where every tub shall be held effectively by brakes or securely coupled to a haulage rope?
33. A loose mineral deposit formed either by chemical weathering at the place of origin or formed by mechanical weathering of the ore body by the stream water. The deposit is known as
34. Which of the following line of face is mostly followed during depillaring operation in India?
35. Spiral attachment with the job of CCM is known as
36. Hydraulic ring main system is used to
37. Maximum supports are required within 10 m of freshly-exposed roof-why?
38. Which of the following method was practiced in NECL for extraction of steep thick seam?
39. A seam is worked at the depth of 120 m from surface and has a width galleries of 3.4 m. The percentage of extraction during development should be restricted to
40. In an underground mine output from the panel is 360 tpd, having 26 days of working in a month where incubation period of coal is 9 month. If recovery from the panel is 80% and pillar size is 30 m × 30 m, height 3 m, coal sp. gravity 1.8 then find out number of pillars in the panel.
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