Drilling And Blasting - Study Mode
[#281] The primed cartridge to be used in sinking shaft shall be carried by
Correct Answer
(B) thick felt bag
[#282] Which of the following apparatus is suitable for drilling while approaching water logged underground workings?
Correct Answer
(D) burn side boring apparatus
[#283] With homotropal ventilation the velocity of air relative to coal is lessas compared to that of . . . . . . . .
Correct Answer
(A) Antitropal
[#284] Find the height of motive column, when the temperature of upcast and down cast shafts are 40°C and 30°C respectively and shaft is 350 m deep.
Correct Answer
(B) 11
[#285] How you reduce the resistance developed by a ventilation duct.
Correct Answer
(A) Using large diameter duct