Drilling And Blasting - Study Mode
[#131] Methane drainage was first attempted in which mine.
Correct Answer
(A) Ruhr coal field, Germany
[#132] The type of apparatus used to administer pure O 2 to an unconscious person or to whome breathing is feeble called . . . . . . . .
Correct Answer
(D) Reviving apparatus
[#133] ANFO is used in
Correct Answer
(B) Large diameter dry hole
[#134] A roadway driven along dip of seam.
Correct Answer
Level
[#135] Margin of safety usually equals to . . . . . . . . of the depths in case 1 'O' Donhue's formula for shaft pillar.
Correct Answer
(B) 5 - 10%