31. The feed upto temper screw is possible upto
32. Hydraulic stowing is not successful. Where the seam is less than . . . . . . . . m depth and flatter than . . . . . . . . deg.
33. French method employed for a seam depth of
34. The stowing efficiency in mechanical stowing is
35. Each bore rod one end is male other end
36. Ducting pipes diameter nearly
37. Solid coal pillar left intact during extraction of stook pillar called
38. Maximum chances of air blast is associated with
39. The shape of the pillar that gives maximum percentage of recovery with speed reduced amount of lift for loading is
40. VCR modified revision is
Read More Section(Coal Mining)
Each Section contains maximum 100 MCQs question on Coal Mining. To get more questions visit other sections.