Drilling And Blasting - Study Mode
[#796] The contra rotating fans can be coupled together in series for getting . . . . . . . .
Correct Answer
(D) Higher wg
[#797] When the barometric pressure decreases, the methane emmission in under ground work is . . . . . . . .
Correct Answer
(C) Increases
[#798] Optimum rate of stone dusting in under ground coal mines is . . . . . . . .
Correct Answer
(B) 2.5 kg/ton of coal produced
[#799] The vertical depth of a place in the mine from surface.
Correct Answer
(B) Cover
[#800] Intake air to a L/W panel has CO at 10 ppm and O 2 at 20.5, where as return air has CO at 30 ppm and O 2 at 20%. The Grahams ratio % for the oxidation process in pannel is . . . . . . . .
Correct Answer
(B) 0.5