31. Under ground gassification, development done towards
32. Cable drilling employed commonly employed for holes deeper than
33. In drilled shafts all the sinking work can be carried out by
34. Continuous record of bore hole deviation from top to bottom by an instrument by
35. While driving slices, what should be the minimum thickness of rib of coal to be left against adjacent goaf.
36. Pumps are employed when the make of water in the shaft exceed
37. Common rate of sand stowing in μ/g mines is A tons of sand per hour. Value of A is given by . . . . . . . .
38. The number of panels to be opened at a time decided by
39. Water infusion of coal face in ploughing causes.
40. With AFC the length of single unit face commonly
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