31. The ratio at which the cost of open cast mining equals that of under ground mining is
32. In India coal seams with inclination as steep as . . . . . . . . have been worked by mechanical open cast.
33. The maximum size of the boulder that can loaded by shovel is times the bucket capacity.
34. The mining which is not completely effected by weather.
35. Peak particle velocity is estimated from the equation.
36. Depth to which extraction of mineral done economically by open cast project called . . . . . . . .
37. Limitation for inclined drilling is . . . . . . . .
38. Which soil is best for scraper.
39. Drag shovels commonly used to load into . . . . . . . .
40. Where drag line is used before starting excavation of coal a clear space of not less than . . . . . . . .m shall be created.
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