11. RQD signifies
12. Tape extensometers are used to measure
13. If R is the RMR, B is gallery span in meters, D is the rock density in t/m3, what will be the empirieal formula for rock load in ton/m3?
14. The type of supports which needs less man power than conventional supports.
15. If the width of excavation increases, the span of pressure arch . . . . . . . .
16. Sal props are available in lengths upto
17. Proximate analysis of coal gives the percentage of
18. The hole should terminate . . . . . . . . m below, if immeidate roof is shale.
19. Storing space required for roof bolts are
20. For starting a mine, the required is
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