11. Which type of drilling pattern is generally followed in solid blasting face?
12. Maximum accidents in Indian mines is due to
13. Square pillars in B & P panel are of size 30 m centre to centre and the galleries are of width 4 m. The tributary area for each pillar in m2 is
14. Which of the following faces are not permitted to run in B & P district?
15. The full form of 'RMR' is
16. In a 2nd degree gassy mine the velocity of air measured at the maximum span of long wall face should be
17. The equipment that is NOT used in hard rock metal mining drivage is
18. In case of metalliferous mines, if depth of a shaft exceeds 1000 m but not 1500 m, no winding rope shall be used or continued in use, if its F.O.S. is or becomes less than
19. A lease holder cannot abandon a mine or part unless
20. Over speeding of coal tubs are restricted by
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