1. The purpose of placing the oil bottle between drill and the receiver, when drill is working.
2. The rotational speed of drill rods by down the hole hammer drills.
3. Well hole drill mast length ranges from . . . . . . . .
4. Pore water pressure affects
5. The width of bench floor in mechanised quarries is usually . . . . . . . .
6. Rippability of the rocks can be known with the instrument.
7. The number of blows produced by down the hole hammers bits.
8. Jack hammer drills upto a depth of
9. The stripping ratio for bucket wheel excavators is
10. Which are the explosives used in strip mining.
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