Mine Ventilation - Study Mode
[#356] Methane drainage was first fried in the colliery in Ruhr coal field of . . . . . . . . in 1943.
Correct Answer
(B) Germany
[#357] CMRS has patented a H 2 S detector tube which detects . . . . . . . . ppm of H 2 S.
Correct Answer
(B) 1 - 50
[#358] Methane can form a layer along the floor of the workings, if the density of the gas mixture more than
Correct Answer
(D) 1%
[#359] The percentage of methane present in mine air by volume.
Correct Answer
(C) 0.46
[#360] Methane accumulates in mins in
Correct Answer
(D) roof cavities