Q626
No working of gallery in gassy mine which has approached within . . . . . . . .m of known dyke, shall be extended to a distance of . . . . . . . .m from the nearest ventilation connections unless the air is coursed upto a point within . . . . . . . .m from the face.
A.
20, 4.5, 4.5
B.
25, 4, 4
C.
30, 4.5, 4.5
AnswerD.
45, 4.5, 4.5
Answer: Option C
Solution
Answer: Option C
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