Rotory drilling methods are
A. Saw toothed cutter drilling
B. Tricone rock roller drilling
C. Chilled shot drilling
D. All of these
Answer: Option D
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The required water for 1 ton of sand in hydraulic sand stowing is . . . . . . . .
A. 800 l
B. 600 l
C. 1100 l
D. 1200 l
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