31. Solid block of coal surrounded all sides by gallaries.
32. Surveyor mark reference points by plugs are fixed in roof after every . . . . . . . .m along the centre line.
33. The gradient and direction of drift maintained in the hands of surveyor the instrument is . . . . . . . .
34. Fires are practically unknown in . . . . . . . . coal mines.
35. Stone dust used for dusting, should not contain more than . . . . . . . .% silver.
36. Inclines are usually steeply dipping at
37. What is the nature of flow of air in mines?
38. How strong is the NONEL tube.
39. Haldene apparatus used for
40. In a mine a solid block of rock, which protects the inclines and shafts called as
Read More Section(Drilling and Blasting)
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- Drilling and Blasting - Section 1
- Drilling and Blasting - Section 2
- Drilling and Blasting - Section 4
- Drilling and Blasting - Section 5
- Drilling and Blasting - Section 6
- Drilling and Blasting - Section 7
- Drilling and Blasting - Section 8
- Drilling and Blasting - Section 9
- Drilling and Blasting - Section 10