Lowering and raising of rods in percussive drilling by means of
A. Retaining key
B. Stirrup
C. Brace head
D. Sludger
Answer: Option A
This Question Belongs to Mining Engineering >> Coal Mining
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The required water for 1 ton of sand in hydraulic sand stowing is . . . . . . . .
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B. 600 l
C. 1100 l
D. 1200 l
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