Q877
How will you decide the diameter of drill rod to be used in UG coal mines?
A.
the rod must allow a clearance of at least 0.3 ern over the cartridge diameter
AnswerB.
the rod shall be same as that of roof bolting drill
C.
there is no such conditions to be adhered for fixing diameter of rod
D.
it depends on the face dimension and of drill pattern fixed by CM
Answer: Option A
Solution
Answer: Option A
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