21. The flow rate of water in hydraulic mining for coal should be atleast a gallen per minute given by
22. Hole dia meter of Jack hammer drill varies from
23. Jet piercing is suitable only for rocks.
24. Type of drill bit commonly used for Jack hammer.
25. The degree of fragmentation in primary blasting can be increased by increasing special charge and decreasing the . . . . . . . .
26. If the pit wall are too steep to allow suitable blends the layout of haul road geometry selected to be
27. Scraper overall height is . . . . . . . .
28. Total number of injuries in open cast mine employing 800 persons is 16 in a year, as per the DGMS norms, the injury rate per 1000 person employed is . . . . . . . .
29. Drilling, blasting is eliminated in the following open-cast method.
30. Hydraulic shovels which eliminate the use of . . . . . . . .
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