11. Speed of rotation in saw toothed drilling
12. While working contiguous seams ventilation may be through
13. Ventilator used in sinking shaft commonly with a capacity of
14. The method of drilling not belongs to Rotory drilling
15. The thickness of thickest seam in India is in meters.
16. Each drill consumes nearly . . . . . . . . of free air per minute work at time in 6 m diameter shaft
17. Any excavation made or being made in a mine for search of or obtaining coal called
18. Construction of brick wall is carried out from with the help of . . . . . . . . in permanent lining.
19. The goaf subsidence can be reduced to about . . . . . . . . of the amount caused by caving in hydraulic stowing.
20. The curb rings are made of
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