21. Which types of cables are used in portable & transportable apparatus?
22. Which of the below- mentioned coal subsidiary of Coal India Limited has no underground mine?
23. No winding rope, which has been in use for more than "A" years, shall be used for winding purpose. A is given by
24. For hydraulic transportation of solids in pipelines, the ratio of the size of solids to the pipe diameter should not be more than
25. Long wall mining method is best suitable for
26. Based on the manpower, what should be the quantity of air supposed to flow through the in bye most galleries?
27. The current average OMS in Indian underground coal mine with SB technology having SDL/LHD is
28. The process of underwater mining of sand, clay, tin and placer deposits of gold is known as
29. In sublevel stoping operation the draw system is generally
30. The full form of 'SSR' is
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