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This question belongs to Mining Engineering Mining Machinery

Mining Machinery

?

For drilling in stone coal drill some times used by changing the gear box to reduced the speed of bit to nearly . . . . . . . . rpm and . . . . . . . . type drill rods used.

A) 200; diamond B) 250; turbine C) 280; ecentric D) None

Answer & Solution

Correct Answer: Option B

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Question posted by Examveda

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