Q9
What should be minimum quantity of air to be circulated along a long wall face at its maximum speed of 7.5m for a 3m thick gassy seam of 3rd degree?
A.
989.5 m3/min
B.
1447.5 m3/min
C.
1687.5 m3/min
AnswerD.
2022 m3/min
Answer: Option C
Solution
Answer: Option C
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