Mine Ventilation - Study Mode
[#251] A gas mixture contains CH 4 , C 2 H 6 and H 2 with respective concentration of 75%, 15% and 10% by volume. The lower explosibility limit of CH 4 , C 2 H 6 and H 2 are 5.0%, 3.3% and 4.2% respectively. The lower explosibility limit of the gas mixture, in percentage, is
Correct Answer
(D) 4.56
[#252] The voltage range of D6 methanometer . . . . . . . .
Correct Answer
(C) 2.2 - 2.8
[#253] Ascensionally ventilated coal mine inclines ideally should have a higher methane layering number when compared to descensionally ventilated inclines. The reason is
Correct Answer
(D) Descensionally ventilated incline creates conditions for improved turbulent mixing of methane layer
[#254] An air sample produces 8% CH 4 and 3% H 2 . If the lower flammability of CH 4 is 5% and H 2 is 4%, what is the lower flammability of the mixture?
Correct Answer
(C) 4.68%
[#255] Which one of the following is used as an escape apparatus in u/g coal mine?
Correct Answer
(C) Any open circuit rescue apparatus