1. Rotory drilling methods are classified in to
2. The sketton rings are also called
3. Number of tonnes of sand required for stowing porton of coal extracted during depellaring . . . . . . . .
4. Main purpose of mud flushing
5. Purpose of Brace head in percussive drilling
6. Working coal in the pillars formed in the operation in bord and pillar mining is
7. Controlling the course of a bore hole so as to follow predetermined path . . . . . . . . is
8. The bricking curb also caned
9. Minimum quantity of air flow required for solid blasting face is
10. The French method to suited to roof of
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