51. The mining which is uneconomic if beds are deeper depth.
52. Why diesel powered excavators are popular.
53. Over burden dumped to the . . . . . . . . of out crop.
54. Scrapers are suitable in soils of . . . . . . . .
55. Prior to starting of open cast working some trenches are excavated to expose mineral body. The trenches are very long but limited depth; what is approximate depth.
56. Which dums are prefered in hilly terrain depsoits.
57. The height of coal bench should not exceed.
58. The depth of holes drilled by wagon drill ranges from
59. The depth of drill holes ranges from . . . . . . . . by well hole drill machine.
60. At what slice thickness the surface miner cuts the coal.
Read More Section(Opencast Mining)
Each Section contains maximum 100 MCQs question on Opencast Mining. To get more questions visit other sections.