Drilling And Blasting - Study Mode
[#266] No drill shall be used for boring a shot hole unless it allows a clearance of at least "A" em over the diameter of the explosive cartridge. A is given
Correct Answer
(D) 0.3
[#267] The minimum pillar to pillar distance of the depth of the seam is 150 m and gallery width is 3.6 m.
Correct Answer
(B) 19.5 m
[#268] Meen air temperature of a 450 m deep down cast shaft is 29°C and that of the up cast shaft is 37°C, the height of the motion column m is . . . . . . . .
Correct Answer
(C) 11.6
[#269] For reducing leakage in u/g workings it has been recommended to use.
Correct Answer
(B) Low pressure fan in series
[#270] The constituents in slurry explosive are
Correct Answer
(A) Fuel sensitizer, oxidizer, water, thicker, cross linking agents, gassy agent, stabilizer