21. The pipe joints should be occasionally tested at a pressure of . . . . . . . . in hydraulic stowing.
22. Cuttings from bottom of hole removed in percussive drilling by means of
23. Daily advance of gallaries by continuous, miner is . . . . . . . .
24. In which shape of shaft resist heavy side pressure, offers least rubbing surface to ventilating air
25. Brine is a solution of
26. Deviation of bore hole increases with
27. Bumps occurs usually in the following condition
28. The type of core barrel prefered to get better core recovery inhomogenious formation
29. The poor recovery of core, causes because of the drill rods make
30. A hole 1.2 - 1.5 m deep may require . . . . . . . . of explosive charge
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