31. The limiting gredient of ordinary vehicle is . . . . . . . . from the horizontal.
32. These things are employed, heavy earth moving machinery well hole drills etc for extraction of mineral.
33. R.M.R stands for
34. The type of drill bit employed in wagon drill machine.
35. Scrapers are unsuitable in soils with . . . . . . . .
36. The effective position of box cut for a deposit whose OB ratio: ore is least should be
37. Air consumption by down the hole hammer drills at . . . . . . . .
38. Cut off grade is
39. The conditions suitable for internal dump are
40. The best principle for predicting of dump failure at the begining stage.
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