The flow rate of water in hydraulic mining for coal should be atleast a gallen per minute given by
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Hole dia meter of Jack hammer drill varies from
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Jet piercing is suitable only for rocks.
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Type of drill bit commonly used for Jack hammer.
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The degree of fragmentation in primary blasting can be increased by increasing special charge and decreasing the . . . . . . . .
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If the pit wall are too steep to allow suitable blends the layout of haul road geometry selected to be
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Scraper overall height is . . . . . . . .
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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 . . . . . . . .
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Drilling, blasting is eliminated in the following open-cast method.
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Hydraulic shovels which eliminate the use of . . . . . . . .
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The limiting gredient of ordinary vehicle is . . . . . . . . from the horizontal.
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These things are employed, heavy earth moving machinery well hole drills etc for extraction of mineral.
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R.M.R stands for
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The type of drill bit employed in wagon drill machine.
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Scrapers are unsuitable in soils with . . . . . . . .
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The effective position of box cut for a deposit whose OB ratio: ore is least should be
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Air consumption by down the hole hammer drills at . . . . . . . .
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Cut off grade is
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The conditions suitable for internal dump are
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The best principle for predicting of dump failure at the begining stage.
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